How do you calibrate a m2's speedo

[fatboy1]

does any one know how to calibrate a m2's speedo? Can this be done manully or have to let dealer fix it thanks.

 

[greg334]

It's done through software and the J1939 port - it is all electronic and has been for a long long time.

Why do you need it done?

Tire change?

 

[fatboy1]

yeah the tires has been changed from 11r22.5 to a lo pro and speedo is about 4-5 mph slower and driving me crazy thanks for the info.