I have some 95 gsr rims to put on my crx si , what size tire should I put on them to keep the same gear ratio and to keep my speedo the same. 195 50 15 or 205 50 15

 

195/50/15 is the correct spec, if you want 205's you would have to get 45's for it, but i dont think that really any tire manufacture makes 205/45/15, i have looked before and couldnt find that size, but using 205/50/15 really wont make that big of a difference on the speedo.

 

Actually 195/50/15 and 205/50/15 are both off by the same amount from the overall diameter. A 185/60/14 is 22.8". The 195 is 22.6" and the 205 is 23". So they are both off by .2" just one is larger and one is smaller.

 

really, wow thats weird, i was just using the plus size method, thanks for the info.

 

hmmm, sounds like we've got some folks who know their stuff as far as tire/rim sizes go, so let me ask this one....

going from stock 185/60/14 to 205/45/16.... how much difference in speedo readings? what's the total diameter difference on these ones?

TIA
Eric

 

According to http://www.miata.net/garage/tirecalc.html:

a 205/45/16 would be 2.3% bigger than the 185/60/14.