The Complete Guide to Electric Bikes by Zappy Wheels

Author:Zappy Wheels
Language: eng
Format: epub
Tags: bike guide, electric bike guide, electric bike book, bicycle maintenance, bicycle touring, bicycle repair, bicycle guide
Publisher: Zappy Wheels
Published: 2017-04-19T00:00:00+00:00

Rear Hub Motor

Rear hub motor e-bikes are the ones in which the motor is placed directly on or inside the rear wheel. The majority of electric bikes come with a rear hub motor because they are much cheaper than a mid-drive motor, but still power the bike very effectively. There are two types of rear hub motors: direct (gearless) and geared.

Direct hub motors have different names like brushless, direct drive, gearless and they all mean the same thing. The direct rear hub motors are generally larger and heavier and because of that make use of the whole hub shell. They’re also more durable because there are no gears and, therefore, fewer moving parts. They can go faster, but since they’re heavier, they have some drag and give a little less torque. They’re also very silent since they have no moving parts. A direct hub motor is always engaged and can make use of regenerative braking, which will give some extra electricity back to the battery. Some, but not all direct hub motors have this feature.

On the other hand, geared rear hub motors are relatively smaller and lighter than direct rear hub motors. They can even pass for regular wheel hubs. They have relatively more torque but can’t go as fast as direct hub motors. There is less drag in these motors, but since there are multiple moving parts, you can expect some noise from the motor. Still, they are very durable as well. Another important difference is that when the motor isn’t in use, the wheel can move freely, so there’s no resistance. But this also means there can’t be regenerative braking.

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