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All  |   Discussion (0)PABs (Power-assisted bikes)

An efficient PAB has:
- torque applied directly to the rear wheel's hub, not by friction to the tyre or wheel
- the engine inside the hub for better weight distribution
- a good battery (light, compact: <1kg; powerful: 200-400W; smart: fool-proof, long-life, less toxic to the environment)
- a pedal-sensor: assists only when pedalling
- an electronic controller: adjustable power, e.g. a grip-shift throttle or pedal sensor
- a battery power gauge: to let you know when the power is running low

Research shows the best PABs currently run for ~70km on a sealed flat road, no wind, and some pedalling.   kellyjones00 (593)

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