Wheel Fitment Guide 2GS/IS-01-05/SC430
09-18-13, 06:56 AM
#106
Thinking of sending out my wheels to wheelflip to rebarrel to a steplip, 19x8.5 +42\19x9.5 +42 but now have to go to a 20 cause of the steplip need to know the best offset for a 20x9.5/20x10.5 and the car sitting on tein cs .
09-24-14, 08:52 PM
#107
Driver School Candidate
I'm checking out a set of wheels for my 2nd Gen GS and the spec is 19x9.5 +22. I'm sure the rear won't be much of a problem, but how about the front. Would I need to do anything other than a roll to make them fit properly and how much camber would need to be done? The tires I am looking to put on them are either 40x225 or 235 and lower the car about 1" and a half above the lip of the rim. Thanx in advance for your comments.
09-25-14, 12:08 AM
#108
Lexus Test Driver
iTrader: (16)
Join Date: Dec 2012
Location: FL, UK & Deutschland
Posts: 1,149
Likes: 0
Received 0 Likes
on
0 Posts
This Wheel/Tire Q&A thread is a lot more helpful as it contains more information: https://www.clublexus.com/forums/gs-...-a-thread.html
But, to answer your question, the rear should be fine and with the front I'd run a 225/35. A roll should be fine and once lowered should provide enough camber to fit nicely.
But, to answer your question, the rear should be fine and with the front I'd run a 225/35. A roll should be fine and once lowered should provide enough camber to fit nicely.
10-23-14, 07:37 PM
#109
Driver School Candidate
Join Date: Oct 2014
Location: Myrtle Beach
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
fitment
What offest would be good on a concave wheel 19s
98-05 GS300/400/430
01-05 IS300
02+ SC430
Author: rominl
Creation Date: 3/2/2004
Modify Date: 10/26/2005 (SC430 information)
Introduction
After modifying my 1998 GS400 over the past 19 months, I have learned a great deal of information about the car and aftermarket parts. It's amazing just how many stuff you can find out there for the 2nd generation GS. If you are willing to spend the time and effort you can easily build up a GS that's not only special but unique.
Among all the parts I have put on my car, wheels are definitely one area that requires tons of study and research in order to get a setup that's perfect for your taste and style. Make one mistake and you can be stuck with wheels that don't fit well, rub, or even hit your brakes. It's very different from getting other parts for the car, where you just decide on the model and that's it. With wheels, you have to decide on the diameter, width, offset, and disk type. On top of that for the tires you also run into the same problems on tires as well.
I have had countless of people coming to me and ask about the fitments for their cars, so I have decided to compose this guide, which hopefully can give some pictures on how you should choose a fitment for your car. Please note that I am just speaking from my experience so sometimes I could be wrong or the setup isn't perfect.
Definitions
First of all I want to go over some definitions, some of them are official and some of them are just my terms. But I think they are very helpful.
First of all is offset. If you have no idea what wheel offset is, please read the link from TireRack below. It's extremely helpful:
TireRack Offset Description
Offset is definitely the most important area when it comes to choosing your wheels, and it goes side by side with the widths of the wheels.
Another thing to keep in mind is the disk type. This is very crucial when you plan to have big brakes on your car. Keep in mind, if you want to see whether big brakes (Brembo, AP Racing, Stoptech, Endless) will fit under the wheel, the disk type of the wheel is the more important. Offset might have something to do with it but disk type is the most important. You need high disk setup in order to clear the huge brake calipers. With medium or low disk setup you will probably get more lips on the wheels but most likely you won't be able to fit any big brakes.
Most people with wheels they lower their cars as well. There are a lot of way to measure how much a car is lowered, but when it comes to lowering and wheels fitment, I think the "finger gap" theory works pretty good (mainly because overall diameter of the wheel with tires could be different from a setup to another, and the wheel gap (the gap between the top of the tire and the fender) is what determines whether you might rub or not.
I would measure the wheel gap by finding out how many finger(s) you can stick in the wheel gap by placing your finger(s) horizontally. This is important, horizontal, not tilted or angled. Usually each finger is about ½ inch from my experience (of course each person's fingers are different, but this is a good ballpark). So say you have 1 finger gap that means you have about ½ inch gap, if you have 2 then it's about 1 inch gap.
Last definitions would be fender rolling and trimming/shaving. Often times when you want to put on aggressive setup on the car, you are required to work on the fender a little bit in order to avoid rubbing (when the wheels get way too close to the fender). On the GS and the IS, I strongly suggest trimming or shaving the fender rather than rolling. Rolling fenders on the GS and IS could be very risky since you might easily crack the paint, while shaving you can get the same result but it would be very easy to control and it is harder to crack the paint. There will be another article about fender trimming and shaving on the GS and IS.
GS wheels fitment
The stock GS 17" wheels, as far as I know, are 17x8 with 235/45/17. I have owned two sets of aftermarket wheels for the car, 19" VolkRacing AV3 19x8.5 +38 front and 19x9.5 +38 rear, and now I have the 20" HRE 540R 20x8.5 +32 front and 20x10 +43 rear. I would classify my 19" setup as a conservative setup as it doesn't flush totally with the fender but have zero rubbing issue, whereas with the HRE, the setup is very aggressive and is flush perfect with the fender, but has slightly rubbing which was fixed relatively easy.
The following are the wheel sizes that I would suggest for the GS (if you don't want to have a staggered setup, just put whatever for the front in the back). When I say the setup is conservative, it means you don't have to do any fender modification. When I say aggressive, that means you probably have to do the rolling or shaving. And in the case of professional, then some major suspension changes would have to be made in order to fit the wheel, and should be left to professionals hence I won't go over how here.
18" Difficulty
18x8 +32 18x9 +32 conservative
18x8.5 +38 18x9.5 +38 conservative
18x8.5 +38 18x10 +44 conservative
18x8.5 +32 18x10 +42 aggressive
18x9 +38 18x10 +42 aggressive
18x9 +35 18x10 +35 professional
19" Difficulty
19x8 +32 19x9 +32 conservative
19x8.5 +38 19x9.5 +38 conservative
19x8.5 +38 19x10 +44 conservative
19x8.5 +32 19x10 +42 aggressive
19x9 +38 19x10 +42 aggressive
19x9 +35 19x10 +35 professional
20" Difficulty
20x8.5 +38 20x9.5 +38 conservative
20x8.5 +38 20x10 +44 conservative
20x8.5 +32 20x10 +42 aggressive
20x9 +38 20x10 +42 aggressive
20x9 +35 20x10 +35 professional
** on 20" wheels for the GS, keep in mind that the wheels are out of spec so the overall diameter is off by about 6%. Your speedometer would be off, meaning that when the speedometer says 80mph, you are actually going at around 85mph already. Plus, because of the 1" larger diameter overall compared to 18" or 19" (with tires), you have to be careful with your lowering. From my experience, if you lower your car to 2 fingers, provided that you have the correct offset, you shouldn't rub (or very slightly) the top of the wheel well. If you go 1½ finger gap or less, when going over uneven road or dips, you will most likely rub the top part of the wheel well. Over time you will see part of the rubber wheel well flap got rubbed away. Moreover, with 20", you will rub when you put your steering wheel at full lock (either left or right) and mostly when backing up. This is due to the bigger diameter and when you turn, you rub the front and back of the wheel well (this is one reason why 20" are the biggest rims you can put on the GS with reasonable widths).
When it comes to tires for the GS, the following setup are preferred:
Wheel Size Tires Within Spec?
18x8 235/40/18 245/40/18 yes
18x8.5 245/40/18 yes
18x9 245/40/18 255/40/18 yes
18x9.5 275/35/18 yes
18x10 275/35/18 285/35/18 yes
19x8 235/35/19 245/35/19 yes
19x8.5 245/35/19 yes
19x9 245/35/19 255/35/19 yes
19x9.5 275/35/19 yes
19x810 275/30/19 285/30/19 yes
19x8 235/40/19 245/40/19 no (fat setup)
19x8.5 245/40/19 no (fat setup)
19x9 245/40/19 255/40/19 no (fat setup)
19x9.5 275/35/19 no (fat setup)
19x10 275/35/19 285/35/19 no (fat setup)
20x8.5 245/35/20 no
20x9 245/35/20 255/35/20 no
20x9.5 275/30/20 no
20x10 275/30/20 285/30/20 no
Keep in mind different brands of tires, even with the same profile, will be different too. So for very marginal setup (read: aggressive), the tires might provide the 1 or 2mm that makes all the difference. Tires like the Bridgestone SO3 and Dunlop P9000 are very rounded and "meaty". The rounded corners will help to avoid rubbing. On the other hand, from my experience, Nitto, Pirelli, Yokohama, etc... tires are very "square" so they might enhance the rubbing factor.
IS wheels fitment
I believe the IS stock wheels are 17x7 +50 with 215/45/17. Because of the more compact design, getting wheels for the IS300 would be a lot more crucial in order to avoid any unnecessary rubbing. I don't have any wheels on my IS300 at this point but I will do my best. On the IS300, 19" is the biggest you can go. Doing 20" on the IS300 would require tremendous amount of suspension work and in my opinion it's not worth it.
18" Difficulty
18x7.5 +40 18x9 +50 conservative
18x8 +46 18x9 +50 conservative
18x8 +40 18x9 +50 aggressive
18x8 +40 18x9 +55 aggressive
19" Difficulty
19x7.5 +40 19x9 +50 conservative
19x8 +46 19x9 +50 conservative
19x8 +40 19x9 +50 aggressive
19x8 +40 19x9 +45 aggressive
For tires on the IS300 it's even more important because of the tight wheel well setup. The following are the tires I would suggest (and it highly depends on the tire choices too):
Wheel Size Tires
18x7.5 225/40/18
18x8 225/40/18
18x9 255/35/18
19x7.5 225/35/19
19x8 225/35/19
19x9 255/30/19
If you want extreme fitment, the max you can do would be 19x8.5 in the front with 235/35/19 and 19x9.5 rear with 275/30/19. But I won't be disclosing any offset information here for certain reasons.
SC430 Wheels Fitment
Since November of 2004, I have become a proud owner of the SC430. One of the biggest complaints from most SC430 owners is the stock wheel design. The design from 2002 to 2004 (so called pie-plates) was just not pleasing at all. With the 2005 wheel cover changed to 5 spoke style, it looks a lot better. And in 2006 they once again changed the design and now it's a full alloy 18" setup, no more wheel covers.
Regardless, the stock wheel setup on the SC430 is even more conservative than that you can find on the GS, especially the real wheel where it's sitting very inboard. Visually this is not appealing at all. For sure getting better looking wheels at the correct size and offset becomes a highly discussed topic.
For the record, the stock SC430 wheels they are 18x8 +45, and they are wrapped with 245/40/18 tires. Keep in mind that most SC430 come with run-flat tires and also the tire pressure sensors. Run-flat tires have super thick sidewall for the support, that's why they ride very harsh. A lot of members have complained about the ride of the SC430, saying that it's very stiff and not comfortable. Little do they know that it's all about the tires, by changing the tires to normal all-season or high performance tires, the ride will drastically improved. Moreover, because of the tire pressure sensors, when shopping for aftermarket wheels, you want to make sure you can retain the sensors still. Please check with your wheel suppliers for more information. If you decide to run aftermarket wheels without tire pressure sensors, the warning light will come up on the dash.
Of all the information I have gathered, I have read that 19x9.5 +45 fits on the SC430 no problem, front and back. Granted this setup is extremely conservative and it's far from being flush with the fenders in the back, it's a very good baseline for calculations.
Currently I am running 20x9 +30 with 255/35/20 and 20x10.5 +29 with 285/30/20 on my SC430 without any fender modifications. It's pretty much as aggressive as you can go without modifications, and the SC430 is actually not very friendly in this manner, since both the front and rear fender lining are "integrated" with the fender lip, you can't just shave the lip and call it a day without spending time with the lining as well. I would suggest against this.
And for wheel size, I will only talk about 19" and 20" setup. 18" is the same as stock and personally I think 19" is the minimum.
19" Difficulty
19x9.5 +45 19x9.5 +45 conservative
19x9 +24 19x10 +24 aggressive
19x9.5 +30 19x10.5 +30 aggressive
19x9 +30 19x11 +36 professional
20" Difficulty
20x8.5 +18 20x10 +24 aggressive
20x9 +24 20x10 +24 aggressive
20x9 +24 20x10.5 +30 aggressive
20x9.5 +30 20x10.5 +30 aggressive
20x9 +24 20x11 +36 professional
There are several things I want to point out. First of all, besides the "weak" setup I mentioned, all other setups I put down aggressive as the minimum difficulty. The reason is with those sizes, tire choice plays an important role. Getting the right brand and sizes of tires is the key for no rubbing. If you want any conservative setup, you can just get the aggressive setup and add 6 to 10mm of offset for more room.
For 20", you actually run into the "typical" problem of rubbing the top of the front wheel well lining, just like what you face when putting 20" on the GS. However, on the SC430 it's actually worse since the lining is even stiffer, has more "*****", and there are more places for rubbing. As long as your car is lower to around 2-finger gap, I can pretty much guarantee rubbing the top of the wheel well with 20" wheels. Mine does, but after a while the lining will be rubbed away, leaving a small hole there and everything will be back to normal.
In terms of tires, my suggestions would be as follows:
Wheel Size Tires Within Spec?
19x9 245/35/19 255/35/19 yes
19x9.5 255/35/19 yes
19x10 275/30/19 285/30/19 yes
19x10.5 285/30/19 yes
19x11 295/30/19 yes
19x11* 305/30/19 slightly over
19x9 245/40/19 255/40/19 no (fat setup)
19x9.5 255/40/19 no (fat setup)
19x10 275/35/19 285/35/19 no (fat setup)
19x10.5 285/35/19 no (fat setup)
20x9 245/35/20 255/30/20 no
20x9 245/30/20 255/30/30 yes
20x9.5 255/35/20 no
20x9.5 255/30/20 yes
20x10 275/30/20 285/30/20 no
20x10 275/25/20 285/25/20 yes
20x10.5 285/30/20 no
20x10.5 285/25/20 yes
20x11 295/25/20 yes
20x11* 305/25/20 slightly over
* Please keep in mind, if you want to run 11" wide rim in the back with 305 series tires, you want to add couple of mm to your wheel offset since the tires are wider. Otherwise you run into great risk of rubbing.
And again, different brand and model of tires have different shapes, curvatures, corners, thickness, etc… and all these contribute to how well the overall wheel package clears the fender. All setup here are aggressive, meaning that they are close to the fender walls. You definitely want to be careful and study enough to make sure you purchase the right combo.
Conclusion
Hopefully this is a good guide for everyone who is thinking about getting wheels and tires setup for your GS, IS, or SC430. Getting a perfect set of wheels is very hard I have to say, it involves a lot of researching and patience. Don't rush in finding your set of wheels.
I Looked for a wheel fitment guide on the forum for a while. I couldnt find it till someone pointed me in the right direction. Hopefully this will help out you guys that dont know much about offsets (like myself). I did not do this write up and I am not taking credit for it. I am simply putting it up for others to look at. The original work is found on this page: http://www.lgwnorcal.net/articles/wheelfitment.html[/QUOTE]
98-05 GS300/400/430
01-05 IS300
02+ SC430
Author: rominl
Creation Date: 3/2/2004
Modify Date: 10/26/2005 (SC430 information)
Introduction
After modifying my 1998 GS400 over the past 19 months, I have learned a great deal of information about the car and aftermarket parts. It's amazing just how many stuff you can find out there for the 2nd generation GS. If you are willing to spend the time and effort you can easily build up a GS that's not only special but unique.
Among all the parts I have put on my car, wheels are definitely one area that requires tons of study and research in order to get a setup that's perfect for your taste and style. Make one mistake and you can be stuck with wheels that don't fit well, rub, or even hit your brakes. It's very different from getting other parts for the car, where you just decide on the model and that's it. With wheels, you have to decide on the diameter, width, offset, and disk type. On top of that for the tires you also run into the same problems on tires as well.
I have had countless of people coming to me and ask about the fitments for their cars, so I have decided to compose this guide, which hopefully can give some pictures on how you should choose a fitment for your car. Please note that I am just speaking from my experience so sometimes I could be wrong or the setup isn't perfect.
Definitions
First of all I want to go over some definitions, some of them are official and some of them are just my terms. But I think they are very helpful.
First of all is offset. If you have no idea what wheel offset is, please read the link from TireRack below. It's extremely helpful:
TireRack Offset Description
Offset is definitely the most important area when it comes to choosing your wheels, and it goes side by side with the widths of the wheels.
Another thing to keep in mind is the disk type. This is very crucial when you plan to have big brakes on your car. Keep in mind, if you want to see whether big brakes (Brembo, AP Racing, Stoptech, Endless) will fit under the wheel, the disk type of the wheel is the more important. Offset might have something to do with it but disk type is the most important. You need high disk setup in order to clear the huge brake calipers. With medium or low disk setup you will probably get more lips on the wheels but most likely you won't be able to fit any big brakes.
Most people with wheels they lower their cars as well. There are a lot of way to measure how much a car is lowered, but when it comes to lowering and wheels fitment, I think the "finger gap" theory works pretty good (mainly because overall diameter of the wheel with tires could be different from a setup to another, and the wheel gap (the gap between the top of the tire and the fender) is what determines whether you might rub or not.
I would measure the wheel gap by finding out how many finger(s) you can stick in the wheel gap by placing your finger(s) horizontally. This is important, horizontal, not tilted or angled. Usually each finger is about ½ inch from my experience (of course each person's fingers are different, but this is a good ballpark). So say you have 1 finger gap that means you have about ½ inch gap, if you have 2 then it's about 1 inch gap.
Last definitions would be fender rolling and trimming/shaving. Often times when you want to put on aggressive setup on the car, you are required to work on the fender a little bit in order to avoid rubbing (when the wheels get way too close to the fender). On the GS and the IS, I strongly suggest trimming or shaving the fender rather than rolling. Rolling fenders on the GS and IS could be very risky since you might easily crack the paint, while shaving you can get the same result but it would be very easy to control and it is harder to crack the paint. There will be another article about fender trimming and shaving on the GS and IS.
GS wheels fitment
The stock GS 17" wheels, as far as I know, are 17x8 with 235/45/17. I have owned two sets of aftermarket wheels for the car, 19" VolkRacing AV3 19x8.5 +38 front and 19x9.5 +38 rear, and now I have the 20" HRE 540R 20x8.5 +32 front and 20x10 +43 rear. I would classify my 19" setup as a conservative setup as it doesn't flush totally with the fender but have zero rubbing issue, whereas with the HRE, the setup is very aggressive and is flush perfect with the fender, but has slightly rubbing which was fixed relatively easy.
The following are the wheel sizes that I would suggest for the GS (if you don't want to have a staggered setup, just put whatever for the front in the back). When I say the setup is conservative, it means you don't have to do any fender modification. When I say aggressive, that means you probably have to do the rolling or shaving. And in the case of professional, then some major suspension changes would have to be made in order to fit the wheel, and should be left to professionals hence I won't go over how here.
18" Difficulty
18x8 +32 18x9 +32 conservative
18x8.5 +38 18x9.5 +38 conservative
18x8.5 +38 18x10 +44 conservative
18x8.5 +32 18x10 +42 aggressive
18x9 +38 18x10 +42 aggressive
18x9 +35 18x10 +35 professional
19" Difficulty
19x8 +32 19x9 +32 conservative
19x8.5 +38 19x9.5 +38 conservative
19x8.5 +38 19x10 +44 conservative
19x8.5 +32 19x10 +42 aggressive
19x9 +38 19x10 +42 aggressive
19x9 +35 19x10 +35 professional
20" Difficulty
20x8.5 +38 20x9.5 +38 conservative
20x8.5 +38 20x10 +44 conservative
20x8.5 +32 20x10 +42 aggressive
20x9 +38 20x10 +42 aggressive
20x9 +35 20x10 +35 professional
** on 20" wheels for the GS, keep in mind that the wheels are out of spec so the overall diameter is off by about 6%. Your speedometer would be off, meaning that when the speedometer says 80mph, you are actually going at around 85mph already. Plus, because of the 1" larger diameter overall compared to 18" or 19" (with tires), you have to be careful with your lowering. From my experience, if you lower your car to 2 fingers, provided that you have the correct offset, you shouldn't rub (or very slightly) the top of the wheel well. If you go 1½ finger gap or less, when going over uneven road or dips, you will most likely rub the top part of the wheel well. Over time you will see part of the rubber wheel well flap got rubbed away. Moreover, with 20", you will rub when you put your steering wheel at full lock (either left or right) and mostly when backing up. This is due to the bigger diameter and when you turn, you rub the front and back of the wheel well (this is one reason why 20" are the biggest rims you can put on the GS with reasonable widths).
When it comes to tires for the GS, the following setup are preferred:
Wheel Size Tires Within Spec?
18x8 235/40/18 245/40/18 yes
18x8.5 245/40/18 yes
18x9 245/40/18 255/40/18 yes
18x9.5 275/35/18 yes
18x10 275/35/18 285/35/18 yes
19x8 235/35/19 245/35/19 yes
19x8.5 245/35/19 yes
19x9 245/35/19 255/35/19 yes
19x9.5 275/35/19 yes
19x810 275/30/19 285/30/19 yes
19x8 235/40/19 245/40/19 no (fat setup)
19x8.5 245/40/19 no (fat setup)
19x9 245/40/19 255/40/19 no (fat setup)
19x9.5 275/35/19 no (fat setup)
19x10 275/35/19 285/35/19 no (fat setup)
20x8.5 245/35/20 no
20x9 245/35/20 255/35/20 no
20x9.5 275/30/20 no
20x10 275/30/20 285/30/20 no
Keep in mind different brands of tires, even with the same profile, will be different too. So for very marginal setup (read: aggressive), the tires might provide the 1 or 2mm that makes all the difference. Tires like the Bridgestone SO3 and Dunlop P9000 are very rounded and "meaty". The rounded corners will help to avoid rubbing. On the other hand, from my experience, Nitto, Pirelli, Yokohama, etc... tires are very "square" so they might enhance the rubbing factor.
IS wheels fitment
I believe the IS stock wheels are 17x7 +50 with 215/45/17. Because of the more compact design, getting wheels for the IS300 would be a lot more crucial in order to avoid any unnecessary rubbing. I don't have any wheels on my IS300 at this point but I will do my best. On the IS300, 19" is the biggest you can go. Doing 20" on the IS300 would require tremendous amount of suspension work and in my opinion it's not worth it.
18" Difficulty
18x7.5 +40 18x9 +50 conservative
18x8 +46 18x9 +50 conservative
18x8 +40 18x9 +50 aggressive
18x8 +40 18x9 +55 aggressive
19" Difficulty
19x7.5 +40 19x9 +50 conservative
19x8 +46 19x9 +50 conservative
19x8 +40 19x9 +50 aggressive
19x8 +40 19x9 +45 aggressive
For tires on the IS300 it's even more important because of the tight wheel well setup. The following are the tires I would suggest (and it highly depends on the tire choices too):
Wheel Size Tires
18x7.5 225/40/18
18x8 225/40/18
18x9 255/35/18
19x7.5 225/35/19
19x8 225/35/19
19x9 255/30/19
If you want extreme fitment, the max you can do would be 19x8.5 in the front with 235/35/19 and 19x9.5 rear with 275/30/19. But I won't be disclosing any offset information here for certain reasons.
SC430 Wheels Fitment
Since November of 2004, I have become a proud owner of the SC430. One of the biggest complaints from most SC430 owners is the stock wheel design. The design from 2002 to 2004 (so called pie-plates) was just not pleasing at all. With the 2005 wheel cover changed to 5 spoke style, it looks a lot better. And in 2006 they once again changed the design and now it's a full alloy 18" setup, no more wheel covers.
Regardless, the stock wheel setup on the SC430 is even more conservative than that you can find on the GS, especially the real wheel where it's sitting very inboard. Visually this is not appealing at all. For sure getting better looking wheels at the correct size and offset becomes a highly discussed topic.
For the record, the stock SC430 wheels they are 18x8 +45, and they are wrapped with 245/40/18 tires. Keep in mind that most SC430 come with run-flat tires and also the tire pressure sensors. Run-flat tires have super thick sidewall for the support, that's why they ride very harsh. A lot of members have complained about the ride of the SC430, saying that it's very stiff and not comfortable. Little do they know that it's all about the tires, by changing the tires to normal all-season or high performance tires, the ride will drastically improved. Moreover, because of the tire pressure sensors, when shopping for aftermarket wheels, you want to make sure you can retain the sensors still. Please check with your wheel suppliers for more information. If you decide to run aftermarket wheels without tire pressure sensors, the warning light will come up on the dash.
Of all the information I have gathered, I have read that 19x9.5 +45 fits on the SC430 no problem, front and back. Granted this setup is extremely conservative and it's far from being flush with the fenders in the back, it's a very good baseline for calculations.
Currently I am running 20x9 +30 with 255/35/20 and 20x10.5 +29 with 285/30/20 on my SC430 without any fender modifications. It's pretty much as aggressive as you can go without modifications, and the SC430 is actually not very friendly in this manner, since both the front and rear fender lining are "integrated" with the fender lip, you can't just shave the lip and call it a day without spending time with the lining as well. I would suggest against this.
And for wheel size, I will only talk about 19" and 20" setup. 18" is the same as stock and personally I think 19" is the minimum.
19" Difficulty
19x9.5 +45 19x9.5 +45 conservative
19x9 +24 19x10 +24 aggressive
19x9.5 +30 19x10.5 +30 aggressive
19x9 +30 19x11 +36 professional
20" Difficulty
20x8.5 +18 20x10 +24 aggressive
20x9 +24 20x10 +24 aggressive
20x9 +24 20x10.5 +30 aggressive
20x9.5 +30 20x10.5 +30 aggressive
20x9 +24 20x11 +36 professional
There are several things I want to point out. First of all, besides the "weak" setup I mentioned, all other setups I put down aggressive as the minimum difficulty. The reason is with those sizes, tire choice plays an important role. Getting the right brand and sizes of tires is the key for no rubbing. If you want any conservative setup, you can just get the aggressive setup and add 6 to 10mm of offset for more room.
For 20", you actually run into the "typical" problem of rubbing the top of the front wheel well lining, just like what you face when putting 20" on the GS. However, on the SC430 it's actually worse since the lining is even stiffer, has more "*****", and there are more places for rubbing. As long as your car is lower to around 2-finger gap, I can pretty much guarantee rubbing the top of the wheel well with 20" wheels. Mine does, but after a while the lining will be rubbed away, leaving a small hole there and everything will be back to normal.
In terms of tires, my suggestions would be as follows:
Wheel Size Tires Within Spec?
19x9 245/35/19 255/35/19 yes
19x9.5 255/35/19 yes
19x10 275/30/19 285/30/19 yes
19x10.5 285/30/19 yes
19x11 295/30/19 yes
19x11* 305/30/19 slightly over
19x9 245/40/19 255/40/19 no (fat setup)
19x9.5 255/40/19 no (fat setup)
19x10 275/35/19 285/35/19 no (fat setup)
19x10.5 285/35/19 no (fat setup)
20x9 245/35/20 255/30/20 no
20x9 245/30/20 255/30/30 yes
20x9.5 255/35/20 no
20x9.5 255/30/20 yes
20x10 275/30/20 285/30/20 no
20x10 275/25/20 285/25/20 yes
20x10.5 285/30/20 no
20x10.5 285/25/20 yes
20x11 295/25/20 yes
20x11* 305/25/20 slightly over
* Please keep in mind, if you want to run 11" wide rim in the back with 305 series tires, you want to add couple of mm to your wheel offset since the tires are wider. Otherwise you run into great risk of rubbing.
And again, different brand and model of tires have different shapes, curvatures, corners, thickness, etc… and all these contribute to how well the overall wheel package clears the fender. All setup here are aggressive, meaning that they are close to the fender walls. You definitely want to be careful and study enough to make sure you purchase the right combo.
Conclusion
Hopefully this is a good guide for everyone who is thinking about getting wheels and tires setup for your GS, IS, or SC430. Getting a perfect set of wheels is very hard I have to say, it involves a lot of researching and patience. Don't rush in finding your set of wheels.
I Looked for a wheel fitment guide on the forum for a while. I couldnt find it till someone pointed me in the right direction. Hopefully this will help out you guys that dont know much about offsets (like myself). I did not do this write up and I am not taking credit for it. I am simply putting it up for others to look at. The original work is found on this page: http://www.lgwnorcal.net/articles/wheelfitment.html[/QUOTE]
01-01-15, 11:22 PM
#110
Rookie
Join Date: Jun 2012
Posts: 61
Likes: 0
Received 0 Likes
on
0 Posts
18 wheel fitment question. 18x8.5 +20 front? '99 GS300
I've done some searching and couldn't find exactly what I'm looking for, any advice is appreciated
from the fitment guide...
Read more: https://www.clublexus.com/forums/gs-...#ixzz3Ne6gTfDH
18" Difficulty
18x8 +32 18x9 +32 conservative
18x8.5 +38 18x9.5 +38 conservative
18x8.5 +38 18x10 +44 conservative
18x8.5 +32 18x10 +42 aggressive
18x9 +38 18x10 +42 aggressive
18x9 +35 18x10 +35 professional
so what I'm looking at is a set of wheels local, I believe they are off a Nissan Z
18x8.5 +20 with 245/40/zr18
18x9.5 +40 with 275/35/zr18
Lowered 1" all around, how will these fit? Will shaving be required?
Any assistance is appreciated, hoping to get a quick response before they sell.
from the fitment guide...
Read more: https://www.clublexus.com/forums/gs-...#ixzz3Ne6gTfDH
18" Difficulty
18x8 +32 18x9 +32 conservative
18x8.5 +38 18x9.5 +38 conservative
18x8.5 +38 18x10 +44 conservative
18x8.5 +32 18x10 +42 aggressive
18x9 +38 18x10 +42 aggressive
18x9 +35 18x10 +35 professional
so what I'm looking at is a set of wheels local, I believe they are off a Nissan Z
18x8.5 +20 with 245/40/zr18
18x9.5 +40 with 275/35/zr18
Lowered 1" all around, how will these fit? Will shaving be required?
Any assistance is appreciated, hoping to get a quick response before they sell.
01-08-15, 08:51 PM
#111
Greetings everyone! I know that I'm reviving an old thread, but hopefully you can tolerate my ignorance. I've read through all 8 pages of this thread, plus about 20 pages of various others. I'm really new to the GS family (just bought it two day ago) but I'm looking into upgrading my rollers. Tire Rack has a clearance sale on some 19x9.5's, but they are REAR fitment wheels. It seems that I can run them at all four corners, but I'm not for sure. Here are the specs, if someone could please help out. The front fitment is no longer available, but I've included the specs as a point of reference.
Front:
Size: 19x8.5
Offset: 35mm
Backspacing: 6.06"
Bolt Pattern: 5-114
Rec. Tire Size: 245/35-19
Weight: 29.0lbs.
Rear:
Size: 19x9.5
Offset: 35mm
Backspacing: 6.57"
Bolt Pattern: 5-114
Rec. Tire Size: 275/30-19
Weight: 27.5lbs.
I also see that 245/35/19 tires fit this wheels, so I would go with that size at all four corners. Bridgestone Potenza RE970AS Pole Position
Front:
Size: 19x8.5
Offset: 35mm
Backspacing: 6.06"
Bolt Pattern: 5-114
Rec. Tire Size: 245/35-19
Weight: 29.0lbs.
Rear:
Size: 19x9.5
Offset: 35mm
Backspacing: 6.57"
Bolt Pattern: 5-114
Rec. Tire Size: 275/30-19
Weight: 27.5lbs.
I also see that 245/35/19 tires fit this wheels, so I would go with that size at all four corners. Bridgestone Potenza RE970AS Pole Position
Last edited by gr8bryt; 01-08-15 at 08:57 PM. Reason: Additional information
01-30-15, 12:11 PM
#112
bumping this...
I've spent the last 15 minutes trying to find out what the second gen GS "OEM" wheels specs (offsets) are and it's like trying to find Waldo on this forum. This thread seemed to be full of useful information but the OP failed right off the start by not knowing himself what the OEM specs are. He knew more about the IS :lol: With that being said, it might be a good idea to edit and fix his "introduction" so it states the most important rule of thumb when it comes to wheel fitment, which is knowing what you're starting off with (OEM wheel specs). Hopefully it will help future researchers... ok... done venting... carry on fellas
I've spent the last 15 minutes trying to find out what the second gen GS "OEM" wheels specs (offsets) are and it's like trying to find Waldo on this forum. This thread seemed to be full of useful information but the OP failed right off the start by not knowing himself what the OEM specs are. He knew more about the IS :lol: With that being said, it might be a good idea to edit and fix his "introduction" so it states the most important rule of thumb when it comes to wheel fitment, which is knowing what you're starting off with (OEM wheel specs). Hopefully it will help future researchers... ok... done venting... carry on fellas
Last edited by MY2J; 01-30-15 at 05:29 PM.
02-26-15, 09:13 PM
#113
Well, I've done a more research. Based on the CL wheel fitment calculator, if I go with the rear spec wheels at all four corners, I'll have 15.4mm less inboard clearance and the wheels will stick out by approximately 36mm. I have stock ride height for now, but my plans are for TT BBK up front and lowered by 1.5" all around with 245/40/19 for tires. Can someone help point me in the right direction? I'm thinking that I may need spacers in the rear to give it a balanced appearance.
02-26-15, 09:36 PM
#114
Lexus Test Driver
iTrader: (16)
Join Date: Dec 2012
Location: FL, UK & Deutschland
Posts: 1,149
Likes: 0
Received 0 Likes
on
0 Posts
There's a CL fitment calculator??? LOL never knew that...
Anyway, the 19x9.5 et35 will fit easily on the 2GS. However, if you plan on running the TT calipers in the future you "may" run into clearance problems with it possible hitting the spokes of the wheel. Second, a 40-series tire is too tall for a 19", it'd be best to look into a 35-series tire as it will match the stock diameter more closely. The spacers question is a matter of opinion, just wait until you have the wheels mounted to decide.
Anyway, the 19x9.5 et35 will fit easily on the 2GS. However, if you plan on running the TT calipers in the future you "may" run into clearance problems with it possible hitting the spokes of the wheel. Second, a 40-series tire is too tall for a 19", it'd be best to look into a 35-series tire as it will match the stock diameter more closely. The spacers question is a matter of opinion, just wait until you have the wheels mounted to decide.
02-26-15, 11:02 PM
#115
Ok, cool! So the .5" difference in backspacing won't be a big deal? I've been waffling back and forth between getting TT or LS400 front BBK. The cost for parts is similar, however I prefer to just get a nice set of springs as opposed to coil-overs which most people tend to say are necessary to achieve an even ride height after installing RCA's up front to accommodate the LS4 assembly. I know the TT calipers tend to need a high-disk type wheel in order to prevent the caliper from hitting the spokes. I was thinking the 9.5 width up front would compensate to help avoid that issue. I'd prefer not to run spacers based on a lot of negative feedback that I've read. This will be my first major mod to my car (either wheels or brakes), so I'm not sure which to do first. Maybe wheels first since I'll be able to measure how much room I have for brakes afterwards.
02-27-15, 12:51 AM
#116
Lexus Test Driver
iTrader: (16)
Join Date: Dec 2012
Location: FL, UK & Deutschland
Posts: 1,149
Likes: 0
Received 0 Likes
on
0 Posts
It all depends on the design of the wheels, some higher offset ones (such as 3GS wheels, which I run for winter tires along with LS calipers) have no issues fitting whereas my old 19x9.5 et12 Varrstoens clear with just about the same clearance.
Spacers are a grey-area... they're alright as long as they're used properly. I have a variety of them in different widths for body shop and fitment purposes but the widest I've ever ran on my car were 5mm's. I agree with you though, I don't run them unless I need to.
You're on the right track though. Personally, I'd do suspension first, followed by the brakes, with the wheels last. Just my preference (even though I did suspension, wheels, then brakes).
Spacers are a grey-area... they're alright as long as they're used properly. I have a variety of them in different widths for body shop and fitment purposes but the widest I've ever ran on my car were 5mm's. I agree with you though, I don't run them unless I need to.
You're on the right track though. Personally, I'd do suspension first, followed by the brakes, with the wheels last. Just my preference (even though I did suspension, wheels, then brakes).
02-28-15, 07:48 PM
#117
It all depends on the design of the wheels, some higher offset ones (such as 3GS wheels, which I run for winter tires along with LS calipers) have no issues fitting whereas my old 19x9.5 et12 Varrstoens clear with just about the same clearance.
Spacers are a grey-area... they're alright as long as they're used properly. I have a variety of them in different widths for body shop and fitment purposes but the widest I've ever ran on my car were 5mm's. I agree with you though, I don't run them unless I need to.
You're on the right track though. Personally, I'd do suspension first, followed by the brakes, with the wheels last. Just my preference (even though I did suspension, wheels, then brakes).
Spacers are a grey-area... they're alright as long as they're used properly. I have a variety of them in different widths for body shop and fitment purposes but the widest I've ever ran on my car were 5mm's. I agree with you though, I don't run them unless I need to.
You're on the right track though. Personally, I'd do suspension first, followed by the brakes, with the wheels last. Just my preference (even though I did suspension, wheels, then brakes).
03-04-15, 10:28 PM
#118
so i acquired a set of Advan RGII's for a great deal. The specs are 18x10 +25. All 4 of them. I know the rears will fit without issue. as ive run wider on my GS. But the fronts im not so sure about. I am running Megan EZ coilovers, and have rolled fenders. Also, if they will "fit", what tire size should i run?
03-28-15, 11:59 AM
#119
Need some assistance. I am looking for a setup that will not require cutting or rolling of the fenders with the following sizing/offset for my 2002 GS300:
18x9.5 et 22 or 18x9.5 et30 for the front
18x105. et22 for the rear.
And if i were to do a square setup which would be the best? And what tires options would you guys recommend? I will be lowered on BC Coliovers
18x9.5 et 22 or 18x9.5 et30 for the front
18x105. et22 for the rear.
And if i were to do a square setup which would be the best? And what tires options would you guys recommend? I will be lowered on BC Coliovers
05-12-15, 04:31 PM
#120
Driver School Candidate
Join Date: May 2015
Location: NSW
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Hey guys,
Im new to the forum, and think it is awesome.
Wonder if I can get some help. I've got a 2004 SC430. Want to put 20" rims on it.
The style I was looking at come in:
FRONT: 20x8.5 - Offset 20 or 35 or 45
REAR: 20x9.5 - Offset 20 or 35 or 45
From these choices, what is the most aggressive offset I can select on the front and on the back with no/ minimal rubbing without requiring modifications to the fenders?
Will lower it with MeisterR Coilovers once the new rims are on, so want to keep that in mind.
Thanks in advance for your advice everyone.
Im new to the forum, and think it is awesome.
Wonder if I can get some help. I've got a 2004 SC430. Want to put 20" rims on it.
The style I was looking at come in:
FRONT: 20x8.5 - Offset 20 or 35 or 45
REAR: 20x9.5 - Offset 20 or 35 or 45
From these choices, what is the most aggressive offset I can select on the front and on the back with no/ minimal rubbing without requiring modifications to the fenders?
Will lower it with MeisterR Coilovers once the new rims are on, so want to keep that in mind.
Thanks in advance for your advice everyone.