How do you recalibrate/adjust the speedometer?

[Gvsukids]

Are you using your phone for a GPS app? While connected to USB in the truck? For whatever reason, this will cause it to display the vehicle speed from the Jeep itself, instead of calculating from GPS.

Using my phone, but not connected to the USB.

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[PancakeCritter]

Using my phone, but not connected to the USB.

I guess if you're only changing sizes by 1in....2mph is probably about right. I went from 33" to 37" and mine is off by 6-7mph on the highway.