It is the circumference of the wheel in millimeters. You can measure this yourself as each wheel can vary slightly depending upon the tire used, air pressure, tread wear, and rider weight. You can use the "roll out" method: put the valve in the six o'clock position, roll the bike forward in a straight line until the valve is back to the six o'clock position and measure the length between the two points. If you measure in inches you can multiply by 2.54 to get centimeters or 25.4 to get millimeters. For more detailed instruction read Sheldon Brown's great webpage on the subject here: http://www.sheldonbrown.com/cyclecomputer-calibration.html
SOURCE: Peddle just spin while bike riding bike it will not engage
The chain has come off. Refit it onto the cogs then you will have drive back.
Vote for me if this helps, thanks.
SOURCE: how do I adjust the chain of a 29" pacific mens mountain bike?
Loose the 2 bolts from the rear tire and pull the tire back until the chain tensioned then adjust the bolt again.
4. Wheel size BIKE 1
• Press MODE to change to BIKE 1.
• Press SET briefly and the first digit flashes.
• Set the value by pressing RESET, change to the next digit by pressing MODE.
• Bike 1 is always the bike with the handlebar holder WS 1
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