Since your wheel size is not in the conversion chart listed in the manual, you will need to set a custom wheel size.  You can easily determine your wheel size measurement by measuring the circumference of your wheel in millimeters.  You can do this by 1) Start with your wheel valve stem at six o’clock.  2) Place a marker on the floor by the valve stem.  3) Walk your bike forward until your valve stem is back at six o’clock.  4) Place another marker on the floor by the valve stem.  5) Measure the distance between the 2 markers in millimeters, this should be a 4 digit number.  6) Enter this 4 digit number in your computer in the custom wheel screen. 

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