I just got my tuner and I can't figure out how to change my tire size I see where it asks about tire RPM but how do I figure out that? i got 35x12.5r17 if any one can walk me through this would be great. i googled it and could not find any thing
pick the tune, then select the option to modify the tune, then go to tire size or axle ratio and you'll see a revs per mile setting to adjust for your tires. make the change, then go back until it asks if you wish to install the tune, and choose yes.