i got a nice set of daytona 245 z rated tires and i decided to get a set of burnout tires so i dont destroy my good set of daytons the rims i have for my burnout tires are a 15 inch rim with a 215 tire i was wondering if will effect my speedometer somebody told me you could a inch either way with out it be effected is this true????
I have a 16 inch rim for my daytonas!!!

 

First off, punctuation is needed badly in that run-on sentence.

So currently you are running a 245/??/16 tire on a 16" rim right?

And your "burnout" tire is going to be a 215/??/15?

So you want to know if putting the "burnout" tires on will affect your speedo?

What is the aspect ratio of the 15" tire. It is the center number in the series of three. 215/??/15. You have to figure out the difference of your overall diameters and then do a little math.

This calculator is really handy at figuring that kinda stuff out.