tire size calibration

[spongebob915]

Is there a way to calibrate in RPM on a CTS or XRT. The xrt I only see in done by inches. It only goes up to 34.10 my tire is a 34.8. or is this a dealer only fix..

 

[WHY NOT]

34.10 Will get you plenty close because the tires will squat with the wight of the truck on them. A 35" tire generally isn't a full 35" tall when under the truck