Hey fellas, I'm getting tuned on wednesday and want to adjust my speedo for my 4.10s. I pretty sure I'm gonna need the revs per mile of my tires (285-35-18 vredestein ultrac sessenta) in order to calibrate my speedo. Does someone know this info for the tires or know where I can find it? Thanks

 

You only need look up the size of tire to find its diameter...

The 285/35/18" tire = 25.9" diameter @ 803 RPM

Your tuner will need to know the above info along with the 4:10 gears and you will be golden

Jazzer

 

so he needs to know the diameter or the 803revs per mile?

 

Wouldn't hurt to tell him both, but RPM would be more likely to help. Will certainly need to know the rear gears as well.

Jazzer

 

Thanks jazzer, you're a lifesafer.

 

It's alight