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Discussion Starter · #1 ·
Hello I am a Newbie so I have plenty of questions, but this is my first for now. I just got rid of my 300zx and now I am a IS300 owner. I am having trouble figuring out exactly what tire size I want. I guess all I really want to know is whats the biggest size i can go in a 18 back and front without rolling or shaving. My car is all stock now with no drops or anything. I was hoping for
235/40/18 front
245/40/18 rear

or

225 or 235 all the way around

Can i do any of these without modding anything

The rims are 8 inch and one tire I am looking at is 25.1 while the other is 25.39
 

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Offset? Staggered wheels?
 

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offset, and aspect ratio are both needed to tell you what you need to do.
 

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Discussion Starter · #4 ·
Oh sorry about that the offset is 40 and the wheels are 8 inches back and front. I just wondering what would be the biggest I can go on a 8 inch rim with a 40 offset.

Aspect ratio is 40 as well back and front.
 

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without touching the fenders, probably a 225/40 up front... and a 245/40 out back.
 
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