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The BAFANG BBS02B is a mid-drive electric bike conversion kit that mounts a 500W motor at the bottom bracket, driving through the bike's chain and gears. It ships with the parts most builds need: brake levers with motor cutoffs, chainring, thumb throttle, speed sensor, headlight and bottom bracket removal tools. It suits riders converting a disc- or V-brake bike with a 68-73 mm, 100 mm or 120 mm bottom bracket. Against hub-motor kits it climbs better and keeps weight central, but it needs a battery and display bought separately and adds drivetrain wear.
In stock
In stockSold by GreenergyReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
Store links may earn us a commission. Some prices via Klarna.
Lowest price we've seen: $585.99 on Nov 13 at Banggood. Tracked across 1 store since Nov 13.
Owners of BBS02B kits generally report strong, quiet assistance and good hill climbing once installed. Most complaints center on installation effort and the extra cost of battery and display.
This is a BAFANG BBS02B mid-drive conversion kit for building a custom electric bicycle. The motor is rated 36V 500W and uses a CAN bus system. The kit includes brake levers, chainrings, a thumb throttle, a speed sensor, a headlight and bottom bracket removal tools.
It fits mountain bikes, urban commuter bikes and recumbent tricycles that have a chain drive and either disc brakes or V-brakes. It fits bottom brackets 68-73 mm, 100 mm or 120 mm long with an inner diameter of 33.5-36 mm, to JIS standards. The 73 mm screws are not included.
The kit offers three riding modes: throttle, pedal assist and standard riding. A CAN protocol display can be chosen separately. This version comes without a battery, so a compatible battery is needed.
