Bafang BBS02B 48V 500W Mid Drive Motor Kit -

The Bafang mid drive motor kit is a popular ebike conversion kit, which we have been supplying since 2014. This tried and tested ebike kit is well regarded within the ebike community, with spare parts and installation / maintenance information readily available online.

The Bafang BBS01B 36V 250 watt mid drive motor kit offers a good combination of strong torque, high efficiency with low power consumption and noise output. The motors central mounting position results in a balanced low center of gravity, with power output transferred through the bikes drivechain, meaning the motor can operate within its optimum RPM range.

The Bafang kits we supply are the newest version available, with dedicated light and gear shift sensor connectors.

The Bafang BBS02B 48V 500W motor kit is basically the Bafang BBS02B 750W 25A motor kit which has been reprogrammed to 18A, meaning you benefit from the more robust 25A controller. Please note the motor casing is marked BBS02B 750W 25A.

Battery pack is not included with the Bafang motor kit. Click here to view battery listings. Motor kit would be compatible with 48V battery packs only.


Included Parts:

Bafang Mid Drive Brushless Motor (internal controller).
LCD Display C965 + Operation Button (options include Colour 500C, Colour DPC18) .
Thumb Throttle.
46 Tooth Chain Ring + Plastic Chain Cover (options include 44T, 48T Chain Ring).
2 x Brake Cutoff Levers (options include hydraulic brake sensors)
Left And Right Crank Arms.
Speed Sensor + Magnet.
1T4 Wiring Harness - Waterproof Quick Release Connectors.
Fixing Plate.
2 x M33 Nuts.
2 x M6*12 Cap Head Allen Bolts.
5 x M5*10 Cap Head Allen Bolts.
5 x Self Tapping ST 3.9 Screws.
1 x Installation Spanner.
1 x Crank Extractor Tool.



Voltage: DC 48V
Power: 500 Watts
Current Limit: 18A (controller is 25A version, reprogrammed to 18A)
Motor Weight: 4.25KG
Controller: 9 Mosfet, Intergrated With Motor
PAS Sensor
BB Length: 68mm-73mm Standard Threaded BSA Type
Max torque: >120Nm
Max Efficience: 80%
Waterproof Grade: IP65


Additional Info:

The Bafang conversion kits can be fitted to standard bike frames, through a simple installation process. The donor bike should have a standard bottom bracket width between 68-73mm (not exceeding 73mm), with an inside diameter of approximately 33.6mm - 33.9mm. Longer bolts and washers are included for bikes with a 73mm bottom bracket shell. Carbon frame bikes would likely not be compatible with the Bafang mid drive motor kits, due to increased shell thickness.

The Bafang kit is supplied with a 44T, 46T or 48T tooth single chain ring, so if your bike has a front derailleur it will not be required. 

The supplied brake cutoff levers are cable operated, so will not be compatible with hydraulic brakes. Should you require hydraulic brake sensors including with the kit, please select this option from the drop down list.

We add additional high quality Mobil SHC 100 Synthetic Red Lithium Grease to the secondary reduction gears before dispatching motor kits.

Motor kit is intended for off road use only, as it exceeds the legal power limit of 250 watts. Click here to see government guidelines covering electric bikes.

We are a UK based company, with all stock dispatched from within the UK. Motor kits comes with 1 year limited warranty.

Victor N.

Great motor. Bought and received in a few days! Solid and protective packaging and quick delivery. Review submitted 06/19/2018.

Robin S.

All I can say is wow! Fitted this to an old heavy hybrid, can use pedal assist and throttle at same time so best of both worlds. Mixed riding on roads and cross country trails averaged 15mph purely on throttle topping out at 31mph. Buy the gear shift sensor as a must, a decent draper crank puller, same for the bottom bracket, they are really tight in there, and the bafang tool. You'll also be advised to get a decent cable cutter for the gear cable. Excellent service from Eclipse, extremely well packed and good communication. Best thing I ever bought in my life, wish I'd gone for the 750 watt unit but having said that, the 500 is everything I had hoped for and more. Took about 4 hours to install. Would I use eclipse again, absolutely! Review submitted 07/05/2020.