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When using a geared motor in your electric mountain bike, you won't need to have a big motor and a big battery for your bike to have a lot of power. A conventional-sized motor and power supply are all you need. Make sure that you have right-sized battery for your motor, so you won't burn up your battery too quickly. Make sure that your motor is protected from any elements like rocks, wind, and rainwater. Don't place it too low, since it can be easily hit by things from the street like small pebbles or sticks. But it ought not to be positioned way too high either, since it will cause some instability in your riding.

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