Originally Posted by 4jfarmer
a 235 in both 15 and 16 wheel diameter will be the same size whichever wheel you use.
I think we need to send you back to tire sizing 101....
235 is only the tread width in millimeters. That's all that tells us.
There's the other number besides the wheel diameter.......and that's sidewall height(or section height). Makes a HUGE difference in tire diameter. 235/70
R15. If it's 70, that means the sidewall is 70% of the tread width. The section height goes down when rim size goes up. So 235/70R15 would be about the same height as a 235/60R16. It's a term called "plus sizing". *note: merely examples, I did not do any actual calculations.