So I'm shopping tire sizes to fit the 18" chrome bullits I just got, and I'm thinking of larger than oem diameter for the rear...

So the question is, if my front tires are close to oem diameter and my rears are a larger diameter, which does the speedo measure rotation on to get speed? anyone?

 

Speedo goes by driveline, which is rear tires.

 

correct rear tires. You can adjust with your tuner.

 

Thanks! ...
(I guess the scenery will go by faster now when I'm doing the speed limit lol)