[sisuX3]

I just got 20" FR500s 20x10 in the back wheel size 285/30-20. It says the revs per mile is 778. Should I tune it to 780 or 775?

[rw0640]

Not positive on this but, I don't think you need to retune for that tire size. That shouldn't mess with your speedometer. because your wheel to tire ratio is different and the overall size should be the same as stock.

[sisuX3]

Originally Posted by rw0640

Not positive on this but, I don't think you need to retune for that tire size. That shouldn't mess with your speedometer. because your wheel to tire ratio is different and the overall size should be the same as stock.

Thanks