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For the gears to withstand the potential forces, they need to be made of high quality, correctly heat-treated materials and also need to be big
Extremely durable, weather-resis
The better value is the model whose layout you will use consistently
This system senses the initial 1/4 to 1/2 turn of the cranks before providing the proportional assist with the torque sensor measuring your pedal power
5 Clayton Have been using them for years
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