2001 Boxster S Aspect Ratios
 

I was just wondering why there is a different aspect ratio from to front to back for this generation of Boxster. Fronts are 40, rears are 35. My initial thought is weight balance, is that correct? This is for an S with 18-in rims

I think it has to do with the diameter of the wheels preferably being close to equal. Aspect ratio is based off the width of the tire. If you look at the diameter of your tires I'm sure they would be about equal. This is assuming a staggered fitment.

BTW where in the bay are you? Color of your 986? Maybe I've seen you around.

Yes, to keep the overall diameter of the wheel and tire consistent. 40% of 225 is 90, 35% of 265 is 92.75