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Speedometer / Tires – Can my speedo be re-calibrated after I install larger tires?

April 26, 2017install larger re-calibrated Speedo speedometer tires

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Speedometer / Tires – Can my speedo be re-calibrated after I install larger tires?

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A. Speedometer calibrations are only available for tire sizes offered as original equipment. Please consult your GM dealer about correcting speedometer output when tire size is changed. NOTE: Changing the calibration to correct speedometer readout does not change the TCM calibration, and thus it does not compensate for the adverse impact on transmission operation.