[DJMikePaul]

Ok ive got the superchips and have had it for some time... but today i was re-calibrating the speedo for my tires... i have P255/70R15 ... online converter (i checked several different ones), says that, that tire is 29.1" in diameter... I went and measured it and it is 27.6". Which measurement should i use?

 

[strausy]

When I recalibrate my speedo I measure from the center of the wheel to the ground x 2 and use that number.

 

[DJMikePaul]

ya.. thanks man... i did what u said and got the 27.6" again.. so im staying with that.