The Bafang BBS02B 750W is the most popular mid-drive electric bike conversion kit in the UK. If you want to convert an existing mountain bike to electric, this is the kit most UK converters recommend as the sweet spot of power, compatibility, and price. Here is our full review.
Bafang BBS02B Specifications
| Spec | Detail |
|---|---|
| Rated power | 750W (48V) |
| Peak power | ~1,200W |
| Torque | ~160 Nm |
| Weight | 2.95 kg (motor unit) |
| BB shell compatibility | 68mm, 73mm, 100mm (threaded BSA) |
| Voltage | 48V (compatible with 52V with care) |
| Display | Bafang 850C or DPC-18 (included) |
Installation How Hard Is It
The BBS02B installation is achievable for a competent home mechanic with basic bicycle tools plus a Bafang-specific BB removal tool. The motor threads directly into the BB shell (replacing your existing bottom bracket), the controller mounts to the downtube, and the display goes on the handlebar. A first-time installer should budget 3-5 hours. A mechanically experienced person can do it in 1-2 hours. Full installation guides and YouTube tutorials are widely available the BBS02B is the most-documented e-bike conversion kit in existence.
How Does It Feel to Ride
The BBS02B provides strong, progressive power delivery. At 750W rated (1,200W peak), there is enough power for steep UK hills, trail riding, and loaded commuting. The torque sensor option provides a more natural, bicycle-like feel than cadence-only sensing. At level 3 (of 5 PAS levels), most riders find the assist sufficient for all-day trail riding without excessive battery drain. The power character is smooth less aggressive than the BBSHD which most riders prefer for daily use.
BBS02B vs BBSHD vs TSDZ2
The BBS02B beats the BBSHD for most standard mountain bikes: lighter, physically smaller, and compatible with more frames including 73mm shells without adapters. The TSDZ2 is popular for its superior torque sensor feel and quieter operation, but has a reputation for less durability at higher power settings. For the majority of UK trail riders who want reliability, good power, and straightforward installation, the BBS02B is the best choice.
Road Legal Considerations
A BBS02B-converted bike at full 750W is not EAPC-compliant (EAPC requires 250W maximum continuous). However, the motor can be configured via Bafang programming software (BAFang Configuration Tool) to limit output to 250W and cut assistance at 15.5 mph, making it EAPC-compliant. If you want a road-legal conversion, specify this when ordering or configure it yourself after installation. The BBS01B (250W version) is designed specifically for EAPC-compliant builds. See our electric bike law guide for full details.
Verdict
The Bafang BBS02B 750W is the best all-rounder mid-drive conversion kit for UK mountain bikes and trail hardtails. Strong power, broad compatibility, straightforward installation, excellent community support, and competitive price make it the default recommendation for anyone considering a conversion. Not sure if your frame is compatible Check our Bafang compatibility guide.
See also: BBS02 vs BBSHD comparison How to convert your mountain bike to electric Shop Bafang kits