I used something similar to a Yellow Box Speedometer Calibrator http:/www.yellr.com and put it between the speed sensor and the ecu.
Haven'd had any issues with it and it was probably cheaper than changing the ecu.
UPYOURKIA
Ya, it is possible to do these with a multidiag J2534 interface. It has the capacity to configure the tire size (winter/summer) and set valves tire pressure.
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