[Design1314]

Originally Posted by bimmernupe

Aspect ratio. Meaning the sidewall is 30% of the tire width.

http://www.tirerack.com/tires/tirete....jsp?techid=46

I went to wiki and found the same answer, so you mean 30 would have a smaller side wall of 35 right? since it's 30% vs 35% I would have a thiner tire on wheels.