Short answer: mid-drive for off-road, hills, and anything over 3 kW. Hub motor for street commuting, budget builds, and simplicity. Almost every serious e-moto (Sur-Ron, Talaria, Stark Varg) is mid-drive — that's not a coincidence.
How they differ
A *mid-drive* motor sits at the crank/swingarm pivot and drives the rear wheel through a chain or belt. A *hub motor* is built into the wheel itself — the wheel is the motor.
Where mid-drive wins
*Unsprung weight.* This is the big one. A hub motor adds 4–10 kg to the wheel — the worst possible place for weight. Suspension has to control that mass on every bump, so traction and compliance suffer badly off-road. A mid-drive keeps the mass centred and low, letting the suspension do its job.
*Gearing leverage.* A mid-drive multiplies torque through the final drive ratio. Swap a sprocket and the same motor climbs steeper hills or gains top speed. A hub motor's "gearing" is fixed by wheel diameter — what you buy is what you get.
*Thermal performance on hills.* Hub motors climbing long grades at low speed operate far from their efficiency sweet spot and cook themselves. Mid-drives spin at high RPM regardless of wheel speed, staying efficient and cool.
*Serviceability.* A wheel with a hub motor means every puncture involves motor cables. A mid-drive wheel is just a wheel.
Where hub motors win
*Simplicity and cost.* No chain, no sprockets, no belt tension, near-zero drivetrain maintenance. For a street commuter that never sees a hill steeper than a bridge ramp, that's a genuine advantage.
*Silence.* Direct-drive hubs are almost perfectly silent. Mid-drives have gear and chain noise.
*Regenerative braking.* Direct-drive hubs regen naturally. Most mid-drives can't regen meaningfully through a freewheel drivetrain.
*Price.* A capable 1.5 kW hub kit costs half of an equivalent mid-drive setup.
The power threshold rule
Below ~1.5 kW: hub motor is fine, buy on price.
1.5–3 kW: depends on terrain — flat city, hub; anything with hills, mid-drive.
Above 3 kW: mid-drive, full stop. At that power the unsprung weight and thermal problems of hub motors dominate everything else.
What the manufacturers chose
Sur-Ron Light Bee: 6 kW mid-drive. Talaria Sting: 8 kW mid-drive. Stark Varg: 60 kW mid-drive. Zero SR/F (street): mid-mounted with belt. The only high-power hub-motor holdouts are budget street scooters — and their handling shows it.
Compare real mid-drive and hub motors — with actual torque figures and prices — in the catalogue at /parts, or drop them into a virtual build in the 3D configurator.