omigosh

This is probably a stupid question, but I just ordered new rims and tires from American Muscle and noticed the front and rear tires have different Revs/mile. Which number do I need to use when reprogramming the speedo or will it ask for both?

Stoenr

rear tire size

Bmr4life

How far off from 27" are they?

omigosh

Thanks, I figured it was the rear. I don't know the exact size yet, they are being shipped. I saw the revs/mile in the tire specs at Tire Rack.

Bmr4life

All you need to do is use this website.

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

Stoenr

yeah, that site is close enough, not perfect, but close enough. The tuner only allows increments of 5 anyway.