Just upgraded tires/rims from a 305/55-20 to a 325/65-18. I am changing my tire size in the mini maxx and speedo is WAY off. I bump it from the 34.6 (I think that's what's in the tuner) to almost a 38" tire and can't get it to read any better. Speedo reads 80 GPS reads 72. Not having any luck as I assumed if I dropped the tire size speedo would just read faster. Any suggestions?
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kyle.malone
Mini maxx tire calibration
That is correct, the tire calibration is off. I used two GPS's and made changes with the tuner until it was on. It took all of 10 minutes on the HWY. I went off-ramp to off-ramp about three times and it was done.
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