Fitment Question + Tire Help - Experts chiime in!
09-14-10, 06:11 PM
#1
Lexus Test Driver
Thread Starter
Fitment Question + Tire Help - Experts chiime in!
So im buying some wheels that are 18 x 8.5 et 30 up front and 18 x 9.5 et 30 in the rear, gonna need tires and I have no clue what size I'm looking at. This is the first time i've ever had to worry about wheels as I have been lowered on BC coilovers with stock wheels for quite some time. don't wanna have to do any fender mod if I dont have to. thanks for any and all input guys 
09-15-10, 06:02 AM
#3
Wheel Fitment Guide 2GS/IS-01-05/SC430
first post:
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
09-15-10, 07:17 AM
#4
Lexus Test Driver
Thread Starter
Thanks dude I Said I read rominls write up. It doesn't say anything about 30 offset front and rear. I see the tire guide. I guess my main question is would I have any issues? And would I need spacers for the front and or rear with those rim sizes?
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09-15-10, 08:57 AM
#8
Let me help you out. I have 18x9+30/9.5+28 and I am pretty low on coilovers with no fender mods, so I'm very close to your setup.
I think your front will be perfect. I'm running 235/40 up front right now to keep from rubbing. About to move up to 245/40 to see what happens.
Use to run 255/35 in rear and had no problems. Moved up to 275/35 and rub like crazy so I'm about to move back down to 255/35. Remember different tire brands are "fatter" than other so that comes into play as well.
Definately no spacers in the rear unless you want to run a stretched tire. Possibly in the front, but I'd stay like they are w/o spacers to be able to run a decent sized tire, but thats just me.
I think your front will be perfect. I'm running 235/40 up front right now to keep from rubbing. About to move up to 245/40 to see what happens.
Use to run 255/35 in rear and had no problems. Moved up to 275/35 and rub like crazy so I'm about to move back down to 255/35. Remember different tire brands are "fatter" than other so that comes into play as well.
Definately no spacers in the rear unless you want to run a stretched tire. Possibly in the front, but I'd stay like they are w/o spacers to be able to run a decent sized tire, but thats just me.
09-15-10, 02:31 PM
#12
the 275s that rubbed are dunlop sp9000.
you will be able to run 245/40 fronts no problem, the question is the rear..
either try 265/35 to see if it works (good chance it will), or be safe and do either the 255/35 or 255/40.
in these pics the setup is 235/40 and 255/35 yokohoma es100. the rear coils were raised up b/c i was about to put on the 275s. also the outside of the 255s were worn down from camber issues (had prev flipped them) giving the tires a skinnier look from the outside.
also check the bottom of page 3 on this thread to see pics before the rear was raised:
https://www.clublexus.com/forums/gs-...k-equip-3.html
you will be able to run 245/40 fronts no problem, the question is the rear..
either try 265/35 to see if it works (good chance it will), or be safe and do either the 255/35 or 255/40.
in these pics the setup is 235/40 and 255/35 yokohoma es100. the rear coils were raised up b/c i was about to put on the 275s. also the outside of the 255s were worn down from camber issues (had prev flipped them) giving the tires a skinnier look from the outside.
also check the bottom of page 3 on this thread to see pics before the rear was raised:
https://www.clublexus.com/forums/gs-...k-equip-3.html
Last edited by 400DGRZ; 09-15-10 at 02:39 PM.
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