SCT tire size setting

[low2tone]

I"m running 37" tires, but the SCT programmer has some crazy numbers starting at 500 rotations per mile crap. anybody have a clue what number it needs to be on for 37s.

 

[F350CCFX4]

Best thing to do is go to the manufacture and get their information on RPM on that particular tire. You can do a calculation to get close, but there are many variations to a 37" tire. Need side wall height and #of plys to get the most accurate #, but much easier to just get the information from the manufacture.