Drive type
Friction drive
A roller against the tyre. Specialist assessment, not a universal fit.
Skarper
Skarper
British disk drive. The motor sits on the chainstay and drives the rear disc, not the tyre and not the bottom bracket. 250 W, about 240 Wh.
250 WDisk drive25 km/h
Maker list
Rubbee
Rubbee
Lithuanian friction drive. A powered roller presses the rear tyre. Lift it off and the bike is a bicycle again.
250 WFriction drive25 km/h
Maker list
Ridekick
Ridekick
A push trailer. The motor and wheel live behind the bicycle and hitch to the seat post. Your wheels stay stock.
250 WTrailer20 mph
Maker list
Bimotal
Bimotal Elevate
US disk drive. It mounts at the rear brake and drives the rotor, so the wheel and the bottom bracket stay stock.
750 WDisk drive20 mph
Maker list
HillTopper
HillTopper
American friction drive. A roller on the rear tyre, clamped near the seat stay.
750 WFriction drive20 mph
Maker list
Gboost
Gboost
Compact European drive listed at 250 W with packs from about 251 to 441 Wh.
250 WFriction drive25 km/h
Maker list