You have to measure the wheels outer circumference, in mm's, then enter that number into the speedometer.
1. Place a strip of tape on the ground, draw a line on it.
2. Place the wheel over the line, align the wheels inner-tube valve with that line.
3. Roll the wheel one complete revolution, mark that spot under the inner-tube valve onto another strip of tape, and measure the distance between those two lines on each strip of tape.
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