Hub Gears With a Mid-Drive Motor

Yes, the two can be combined, and some makers say so directly. But the pairing puts more load through the gear hub, so the details in the manuals matter.

What a mid-drive does

A mid-drive motor sits near the pedals. Wikipedia describes it as a system "where the electric motor is not located in a wheel but instead drives the chain"¹. The motor's push and your own pedalling both go through the chain to the back wheel.

That's why the gear hub matters. Everything the motor adds passes through the hub's gears, on top of what you add yourself.

What Wikipedia says

The e-bike article states that "Mid-drives can be combined with an internal gear hub"¹. It then adds a caution: "This may require care due to the lack of a clutch mechanism to soften the shock to the gears at the moment of re-engagement"¹.

A clutch is a part that joins two shafts so they turn together. The caution is about the moment parts of the hub join up again after a shift. How much that matters for your bike is a question for the hub and motor makers.

What a hub maker says

One hub maker publishes an e-bike version of its hub with a button shifter, described as giving "a synchronized shift at the push of a button"². The same page headlines that version as being for e-bikes². This is a maker's own claim about its own product. It doesn't tell you how any other hub copes.

Power limits on mid-drives

Wikipedia says mid-drive power is typically limited, because it goes through the chain and sprocket, "to protect against fast wear"¹. It adds that a mid-drive uses the bike's existing rear gears, so the motor can work well over more speeds¹. Those are general statements about mid-drives. They don't tell you whether any one hub suits any one motor.

So ask. The hub maker and the bike's builder can answer. A generic claim isn't a green light.

Before you buy: what to look up

• Does the hub maker list your motor, or a motor type, as approved? Look in the hub manual, not the shop listing.
• Does the motor maker say which hubs it works with?
• Does the manual give a limit on the motor's force through the hub? If a number is given, read what it applies to.
• How is the axle held against twisting? Wikipedia says a hub's axle "must be securely braced against rotation"³.

Don't change motor settings or limits to suit a hub. If something is unclear, ask the maker, and follow the manuals for your own bike.