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I purchased a U7137 P/N 285917 and when I tried to adjust my tire size on my 2010 Jeep Commander Hemi and it errored out.

I see from a visit at http://www.diablosport.com/index.php?name=PNphpBB2&file=viewtopic&t=21762&postdays=0&postorder=asc that others have the same problem.

The Preditor is cool for tuning, but the tire size function is useless at the moment so BEWARE.

If you need to change tire sizes, try the Hypertech Speedometer Calibrator. I used that and was sucessful.

Has anyone else tried the U7137 and have current feedback?
 

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I changed my size with no issues. Now the speedo is within a mile or two per hous of my actual.
 
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