1990 crx si with 205/40/zr17 cant find the formula to calculate if these are taller than stock i know its a bigger wheel but a big difference in the series of the tire could me speedo be off now and if someone know is there enough difference for it to be off alot thanks

 

sorry wrong area dont know how to move it now

alright i cant post anymore i checked tire rack stock wheel tire 914 rpm
mine 886 stock dia. 22.8 in mine 23.5 is this enough to throw the speedo off alot


Modified by elrandeeto at 8:27 PM 11/22/2004

 

i have those on my crx. im pretty sure there stock height

 

If you look on the specs charts on tire rack, each tire will have a revs per mile number associated with it. Check it for a 185/60/14 tire vs 205/40/17 tire, and that should give you an idea.

 

205 =tread width
40%of tread width =sidewall height
17 wheel diameter.
does that help? your total sidewall height x 2 + wheel diameter= total height
3.225 in x 2 + 17in =23.456in