The official SC430 wheel style threads (56k warning)
08-19-05, 02:03 PM
#47
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19" wwheels & ? tires
If I go up to 19" wheels instead of 18" what size tires would I go with. Would they have to be smaller than 245. Please keep in mind that I am not lowering the car or rolling any fenders. I just want a nice set up like mellowcmb and jsl757.
08-19-05, 02:58 PM
#49
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245/40/18 is correct for factory.
So 245 rubber on 19" wheels will give me a bigger diameter without rubbing on turns and bottoming out on potholes? One shop said that if I go up to 19" wheels from 18" I would have to reduce the height of the tire from 245. He said the height of both combined stays at factory specs otherwise I will screw up the computer?
You also mentioned 275? Is that a missprint, if not what will that do?
Thanks,
Mario
So 245 rubber on 19" wheels will give me a bigger diameter without rubbing on turns and bottoming out on potholes? One shop said that if I go up to 19" wheels from 18" I would have to reduce the height of the tire from 245. He said the height of both combined stays at factory specs otherwise I will screw up the computer?
You also mentioned 275? Is that a missprint, if not what will that do?
Thanks,
Mario
08-19-05, 03:41 PM
#50
mario,
i have no clue what the shop was saying, but if that's what they told you, go to another shop coz' i think those are misinformation. let me iron the terms out.
245, 275, that's the WIDTH of the tires in mm. so 245 means a tire that's 245mm wide.
the second number is the sidewall height, which is a % of the width.
the third number is the diameter of the RIM that the tire will fit on.
so for example, 245/40/18, that means the tire is 245mm wide, the sidewall is 245 x 0.40 = 98mm, and it's for 18" wheels. if you add everything together, i think the overall diameter of the wheel will be around 26"
now say you go to 19" wheel, you need 245/35/19. that means the tire is still 245mm wide, but the sidewall is not 245 x 0.35 = 85.75mm (instead of 98mm), and it's for 19" wheel. if you add everything together, the overall diameter is around 26" again
the goal is to have the overall diameter of the wheel being about the same as stock, that way the speedo will not be off. so just another example, if you get 20" wheel, the tire will be 245/30/20, if you want to stay with the same overall diameter
and 275/30/19 is not a missprint. that's a tire of 275mm width (much wider than 245), and the sidewall ratio is 30% (instead of 35%). since the tire is wider, although the % is lower, but if you do the math, the sidewall height will be very similar to that of the 245/35/19. try to do it, you will understand
and as long as you get wheels that's of the right offset, width, and also get tires of the right spec, you are good to go
i have no clue what the shop was saying, but if that's what they told you, go to another shop coz' i think those are misinformation. let me iron the terms out.
245, 275, that's the WIDTH of the tires in mm. so 245 means a tire that's 245mm wide.
the second number is the sidewall height, which is a % of the width.
the third number is the diameter of the RIM that the tire will fit on.
so for example, 245/40/18, that means the tire is 245mm wide, the sidewall is 245 x 0.40 = 98mm, and it's for 18" wheels. if you add everything together, i think the overall diameter of the wheel will be around 26"
now say you go to 19" wheel, you need 245/35/19. that means the tire is still 245mm wide, but the sidewall is not 245 x 0.35 = 85.75mm (instead of 98mm), and it's for 19" wheel. if you add everything together, the overall diameter is around 26" again
the goal is to have the overall diameter of the wheel being about the same as stock, that way the speedo will not be off. so just another example, if you get 20" wheel, the tire will be 245/30/20, if you want to stay with the same overall diameter
and 275/30/19 is not a missprint. that's a tire of 275mm width (much wider than 245), and the sidewall ratio is 30% (instead of 35%). since the tire is wider, although the % is lower, but if you do the math, the sidewall height will be very similar to that of the 245/35/19. try to do it, you will understand
and as long as you get wheels that's of the right offset, width, and also get tires of the right spec, you are good to go
08-19-05, 07:32 PM
#51
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Thanks for the lesson. I understand now. I was mixing up the 2 first numbers. I thought 245 had to do with the height of the tire and 40 was the width.
My last question is about the offset. How is this determined? Is it by adding spacers behind the rim? or is this a fixed number you get when ordering the rim? Does it coincide with rim depth as well. Is the higher the number the more the wheel comes out or vise versa
Please explain this and I will be good to go. I tried to hook up to that link in tires 101, but it didn't take me anywhere.
Thanks,
Mario
My last question is about the offset. How is this determined? Is it by adding spacers behind the rim? or is this a fixed number you get when ordering the rim? Does it coincide with rim depth as well. Is the higher the number the more the wheel comes out or vise versa
Please explain this and I will be good to go. I tried to hook up to that link in tires 101, but it didn't take me anywhere.
Thanks,
Mario
Last edited by camillian; 08-19-05 at 07:39 PM.
08-19-05, 11:17 PM
#53
Originally Posted by camillian
My last question is about the offset. How is this determined? Is it by adding spacers behind the rim? or is this a fixed number you get when ordering the rim? Does it coincide with rim depth as well. Is the higher the number the more the wheel comes out or vise versa
http://www.yokohamatire.com/utcustom.asp
You CAN affect the wheel fitment by adding spacers. It would be as if you bought wheels with the changed offset but the actual wheel offset does not change. When you order rims that can be built with different offsets, you are getting the exact spec built into the wheels. No spacers needed. The offset measurement is independent of wheel width/depth but the two work together to determine how the wheel will fit on the car..
As for the numbers, we deal mainly with positive offsets for our Lexus cars. The larger the offset number, the more sunken in the wheel sits in the wheelwell. Depending of the width, there will be a threshold where the wheel will be sitting outside the fender or if you go the other way, the wheel will hit the internal suspension components.
Last edited by Neo; 08-19-05 at 11:30 PM.
08-20-05, 10:28 PM
#54
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Originally Posted by Neo
Here is some info on wheels;
http://www.yokohamatire.com/utcustom.asp
You CAN affect the wheel fitment by adding spacers. It would be as if you bought wheels with the changed offset but the actual wheel offset does not change. When you order rims that can be built with different offsets, you are getting the exact spec built into the wheels. No spacers needed. The offset measurement is independent of wheel width/depth but the two work together to determine how the wheel will fit on the car..
As for the numbers, we deal mainly with positive offsets for our Lexus cars. The larger the offset number, the more sunken in the wheel sits in the wheelwell. Depending of the width, there will be a threshold where the wheel will be sitting outside the fender or if you go the other way, the wheel will hit the internal suspension components.
http://www.yokohamatire.com/utcustom.asp
You CAN affect the wheel fitment by adding spacers. It would be as if you bought wheels with the changed offset but the actual wheel offset does not change. When you order rims that can be built with different offsets, you are getting the exact spec built into the wheels. No spacers needed. The offset measurement is independent of wheel width/depth but the two work together to determine how the wheel will fit on the car..
As for the numbers, we deal mainly with positive offsets for our Lexus cars. The larger the offset number, the more sunken in the wheel sits in the wheelwell. Depending of the width, there will be a threshold where the wheel will be sitting outside the fender or if you go the other way, the wheel will hit the internal suspension components.
08-22-05, 02:35 AM
#56
Originally Posted by Neo
I believe it is +45.
and hopefully neo has answered the question, if something is unclear just ask
i just want to add that offset is something very hard to get a hold of, it's different for every car and it's hard to determine. it's all by experience, calculations, and observations. so it's always a good idea to ask people who has done work on the spefiic models
08-22-05, 05:53 AM
#58
Super Moderator
Originally Posted by rominl
haha and i even forgot about it already, but i think that's right
and hopefully neo has answered the question, if something is unclear just ask
i just want to add that offset is something very hard to get a hold of, it's different for every car and it's hard to determine. it's all by experience, calculations, and observations. so it's always a good idea to ask people who has done work on the spefiic models
and hopefully neo has answered the question, if something is unclear just ask
i just want to add that offset is something very hard to get a hold of, it's different for every car and it's hard to determine. it's all by experience, calculations, and observations. so it's always a good idea to ask people who has done work on the spefiic models
Infiniti also have the offset of the G35c printed in the owner's manual.
08-22-05, 11:06 AM
#60
Originally Posted by Addiction2
OK that lip on those HRE 20" is just SICK!