Electric Bike Conversion Kit

Update: Bafang is selling a new 68-120mm BB BBS02 1000W drive unit which should be available soon. Check out this link for more info. In many ways the BBS02 is the king of mid drive units. Being the most affordable and easily installed on a wide variety of bike frames the BBS02 fails on many fronts when it comes to being installed on fatbikes. Most fatbikes have a much wider Bottom Bracket than the industry standard 68mm. Fat bike manufacturers have mostly standardized on the 100mm BB so the chainline can still not hit the tire in the lower gears. There is...

Update: Bafang is selling a new 68-120mm BB BBS02 1000W drive unit which should be available soon. Check out this link for more info. In many ways the BBS02 is the king of mid drive units. Being the most affordable and easily installed on a wide variety of bike frames the BBS02 fails on many fronts when it comes to being installed on fatbikes. Most fatbikes have a much wider Bottom Bracket than the industry standard 68mm. Fat bike manufacturers have mostly standardized on the 100mm BB so the chainline can still not hit the tire in the lower gears. There is...

Karl Gesslein / August 5, 2015 Bafang has finally decided that their P75NF75 mosfets on the 750 Watt BBS02 are grossly inadequate for the 1200 Watts that they allow to flow through the controller when it is cranked on. It sounds like they are now using the IRFB3077 mosfets which should run much cooler and be able to handle more amps for longer without popping like jiffypop over a bonfire. Under all that horrible-to-remove potting material lies newer cooler running mosfets with the latest BBS02 750W units. What does this mean to you the consumer? It means you can beat on that new BBS02 even...

Update: Newer versions of the 750W BBS02 are shipping with better mosfets that probably won’t blow. Before you take apart your blown controller and switch them out be advised that it is MUCH easier to just buy a new controller with the newer IRFB3077 mosfets, more info about it is here. The BBS02 controller is the weakest part of the BBS02 unit. When Bafang switched to the 9 Mosfet unit and bumped the power up to 750 watts for the US market they did not replace the poor quality mosfets in the controller with ones that could take more power. Poor programming from...

Karl Gesslein / May 6, 2015 BBS02 axle I have hundreds of hours trailriding on the BBS02, here is the BBS02 motor problems I have had so far One bent axle Two broken plastic gear covers One blown controller Two bent chainring adapters One motor has an awfully squeaky clutch Three broken speedos and one lost magnet Two stripped out Bafang crankarms One stripped out nylon gear Granted I am a 205 lb guy who carries a 16lb battery on his back and trailrides like a total hooligan. What steps can you take to minimize the damage to your drive units? Get a smaller...