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Conversion Kits

Crank Drive Kits

Bottom bracket motors for exceptional torque and hill-climbing ability. The crank drive is the premium choice for demanding terrain — all motors are 250W OEM, fully street legal.

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Available Crank Drive Kits

BAFANG BBS01B

36V & 48V — cadence sensor + throttle
  • 36V version — standard torque for everyday riding
  • 48V version — higher torque for steep hills and heavier riders
  • Cadence sensor for natural, consistent pedal assist
  • Throttle control for direct on-demand power
  • 250W OEM, street legal (EAPC)
Full Details →

TONGSHENG TSDZ2B

48V — torque sensor + throttle
  • 48V for strong hill-climbing ability
  • Torque sensor — control power with your pedals
  • Feels more natural than cadence-only kits
  • Throttle for additional direct power when needed
  • 250W OEM, street legal (EAPC)
Full Details →

TONGSHENG TSDZ8

48V — advanced torque sensor
Best Seller
  • 48V — top-tier electric assistance and hill performance
  • Advanced torque sensing for exceptionally strong and smooth power delivery
  • Easier fitting compared to the TSDZ2B
  • Proven reliability — customer favourite two years running
  • 250W OEM, street legal (EAPC)
Full Details →

Why choose a crank drive?

🏔️
Superior Hill Climbing
The motor drives through the bike's own gears, multiplying torque on steep ascents in a way hub motors simply can't match.
⚖️
Balanced Weight
Centrally mounted at the bottom bracket, keeping the bike's centre of gravity low and handling natural.
🔄
Uses Your Gears
Power flows through your existing drivetrain, so changing gear also changes the effective motor output — just like a regular bike.
🛠️
Keeps Original Wheel
No need to rebuild or replace your wheel. The crank drive fits the bottom bracket, leaving your wheels and tyres untouched.

Not sure which fits?

Use our Kit Finder to check compatibility.

Tell us about your bike and we'll recommend the right motor, battery size, and wheel fit — takes about 2 minutes.

🔍 Open Kit Finder
— or call us —
📞 01702 684444
🚚Free UK delivery on all kits
🛡️Full warranty included
🇬🇧UK support from our team

Also available

Geared Hub Kits →