Crank drive motors are widely thought to be the best motors for electric bikes as they allow you to use the bike gears to get up hills or to haul heavy loads.
If you know you are going to have to climb very steep hills, more than 17%, you are better off with a crank drive motor.
The motor is a modest 250 W, the bike only has seven gears, and the bike fully loaded with motor and battery weighs in at just 34 pounds. Yet I get up massive hills on this bike without breaking a sweat.
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