Revolutions/mile for tire size.

Just put on some 18’s with MT 305/40/18 on. Had 17’s before.

I tried imputing the new wheels size for the new wheels into the handheld on a custom tune i have. But it didn’t work

What revolutions/mile did you guys use for a set or 18’s with mt et steets.

I used 740 via MT website.

Thanks

Figure the difference in speed that you're off and multiply your current setting by that to get your speed correct.