Bafang BBS02B 500w 48v Electric Bike Conversion Kit UK

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Set Alert for Product: Bafang Electric Bike Motor Kit Mid Drive 500W 48V Bicycle Conversion Kit Ebike Components Kit Electric Bicycle Motor BBS02B - £417.39
Last Amazon price update was: September 26, 2021 4:39 pm
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Last updated on September 26, 2021 4:39 pm
Bafang BBS02B 500w 48v Electric Bike Conversion Kit UK
Bafang BBS02B 500w 48v Electric Bike Conversion Kit UK


The Bafang BBS02B 500w 48v electric bike conversion kit is a good alternative to the 750w version if you don’t really need the kind of power the latter produces. Personally I think the 500w version of the BBS02B is plenty powerful enough.  For the full review of the Bafang BBS02B click the link at the bottom of this page.

The 500w Bafang BBS02B 48v produces more than enough power for most riders, and in my experience is more reliable over the long-term.

Summary – what makes the Bafang BBS02B so great?

Thanks to its ‘plug and play’ design the Bafang BBS02B will fit a majority of regular bicycles with a few exceptions (see below). Providing your bike has a standard BSA threaded bottom bracket  then installation should be fairly straightforward for the competent DIY enthusiast.

bafang bbs02b mountain bike conversion

A Bafang BBS02B conversion done correctly will produce a great looking E-Bike

This 500w 48v version of the BBS02B has the maximum current capped off at 18A (in the firmware) but essentially it is the same as the 750w version. I personally prefer this model as it still goes very well indeed but I haven’t experienced any controller failures on this model – this is likely to be down to the lower current output of 18A (as opposed to 25A for the 750w).

Caution! Although I would still advise sticking with a 48v battery over a 52v. I have installed quite a few 500w 48v BBS02B versions with a 52v battery without any problems.

If you don’t mind experimenting with the controller settings you can purchase a USB programming cable and download the free open source software  – for more information on how to do this safely, follow the instructions on Karl’s electricbike-blog. I personally recommend keeping the maximum current to 18A and lowering the start current on the pedal assist and throttle to 5% – this will make the start-up much smoother and reduce load on the motor and electronics.

Neat installation – because of the design, a Bafang BBS02B installation if done correctly will result in a very neat and professional looking e-bike conversion.

Choose your power! Most of the Bafang display units allow the rider to choose from up to 9 gradually incremented levels of assist. This means that you as the rider can either decide to stay within your comfort zone (for pedalling) or maybe push yourself that little bit hard and share the workload with the motor. I have written a separate article on using an e-bike to get fit and lose weight on my other website.

Motor Specification:

  • Bafang Model: MMG340.500
  • Motor Model: BBS02B
  • Power: 500W (864w peak with 48v battery)
  • Voltage: 48V
  • Controller Current: 18A
  • No Load Speed(RPM): 140-160
  • Load Speed(RPM): 120-135
  • MAX Torque: 120 N.m
  • Top Speed: 45km/h (depends on bike gearing)
  • Efficiency: > 85%
  • PAS SENSOR: Cadence and Speed Sensor
  • Reduction Ratio: 1 : 21.9
  • Certification: CE/EN 14764/ROHS
  • Waterproof Grade: IP65
  • Bracket bottom length: 68mm-73mm standard threaded BSA type
  • Motor Operation Temperature: -20℃-45℃

What’s in the box:

  • Bafang mid drive motor unit
  • Crank arms (pair)
  • Chainring
  • Brake Lever or Hydraulic Brake Sensor (
  • Thumb Throttle
  • External Speed Sensor
  • Display(DPC18,850C,C965)
  • 1T4 cable (wiring harness)
  • Assorted fixings

Legal notice

The Bafang BBS02B should not be used in public spaces or on the road in the UK due to current laws regarding the power output and speed of electric pedal cycles.


The Bafang BBS02B will turn your humble mountain bike into a high-performance off-road electric bike. I would strongly recommend that you only fit the kit to a good quality bike that has been fully serviced and has decent components (especially brakes).  Installation can be challenging for the uninitiated and requires patience, the right tools and a certain degree of bicycle knowledge.

If you decide to re-configure the controller settings using the optional USB cable, it is fine to leave the peak current at 18A. I’ve yet to experience any controller failures on this 500w version.

Please check out the review below for more information of the Bafang BBS02B.

Visit for the full and detailed Bafang BBS02B review


8.4Expert Score
Bafang BBS02B 500w 48v Electric Bike Conversion Kit UK
The BBS02B 48v 500w is a sensible alternative to the 750w version.
The Bafang BBS02B 48v 500w is basically the same motor as the 750w but with the maximum current limited to 18A in the controller. Considering I usually limit the max current on the 750w BBS02B to 18A anyway it makes sense just to buy the 500w version (unless to want the 25A and1200w peak power of the 750w). I've always felt the 500w produces more than enough power. I've installed loads of this version over the last few years and haven't had any issues, unlike with the 750w version.
Value for money
Ease of installation
  • Good value
  • Great performance
  • Very smooth
  • Quiet
  • Neat installation
  • Much more reliable than the 750w (in my opinion)
  • Not road legal (in the UK and EU)
  • Can be challenging to install

Additional information

Specification: Bafang BBS02B 500w 48v Electric Bike Conversion Kit UK

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