4. Adjust speed slightly:
A. Press M button and switch P0 to P2
P2 can only adjust the speed shown in display slightly, it could not change the real speed.
B. Press +/- to change the data. The proper setting is 15.6 for 16inch wheels, 18.5 for 20inch
wheels. The bigger data is, the higher is the speed in display(will not change real speed).
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