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    Help me understand how derailleurs work with rear hub motor please

    Cant get my head round this. It's obvious how they work if the power comes from the main chainwheel, eg a bottom bracket motor, or just your own legs, the smaller the cog on the derailleur the faster the wheel turns for each rotation of the cog. But when the motor is on the same wheel /hub as...
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    Why so few hub geared bikes with belts ? Looking at Kalkhoff

    After a few years off a bike, now looking for an ebike to aid my dodgy knees. As per title, most bikes seem to have derailleurs, which I hate. Clunky, high maintenance, prone to damage, and just out of place on a high tech bike, rattling a chain around. But it seems few manufacturers or...