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The controller takes the signal from your throttle or pedal sensor and uses it to control how much electricity flows into the motor(s).
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There are a number of forums dedicated to electric bikes, including Endless Sphere and Electric Bike Review.
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The first thing you should consider when choosing an electric bike is the motor size. The larger the motor, the more power it can produce and therefore the faster your bike will go. If you want to go fast on rough terrain, look for a large-sized motor.