By reducing the number of teeth on the rear sprocket or increase the number of teeth on the front sprocket.ĭiameter of gear. ![]() To do this, you would need to GEAR UP the bike. The opposite situation, might be that the bike has lots of power, but is reaching the rev limiter in top gear and you would like to reduce the revolutions at a particular speed. You can do this by adding more teeth to the rear sprocket or reducing the number of teeth on the front sprocket. The answer, might be to GEAR DOWN the bike. You have plenty of top end speed, but need more slow speed control. ![]() An example of this would be, that the bike is difficult to start in first gear and the clutch needs to be used more than you would like. Why do you need to know your gear ratio? It might be, that your bike is not performing as you would like and a change in gear ratio might help the performace. ![]() To calculate the ratio, devide the number of teeth on the rear sprocket, by the number of teeth on the front sprocket and the resulting number is your gear ratio. ![]() An example of gear ratio will be with one gear of 10 teeth and the second gear of 20 teeth, giving a ratio of 2 (20/10=2). The gear ratio, is the ratio of turns made by one gear, compared to the other gear, when the gears are connected by a chain.
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