Chainring Adapter BCD 104
The Chainring Adapter BCD 104 is for the Bafang BBS02 750 watt electric bike motor kit and BBS01 only. Will not fit the Bafang BBSHD 1000 watt.
When you build your bike using the Bafang BBS02 750 watt or the Bafang BBSHD 1000 watt electric bike motor kit and you are using the stock chainring that came with your kit you may be in for a surprise. The stock chainring may come into contact with the chainstay. When this happens you can either use a spacer to move the entire motor, which sometimes creates even more problems, or you can use a chainring adapter and use the original chainring that came with the bike. To use an adapter the holes have to match up. What is a BCD? BCD stands for “Bolt Circle Diameter.” If you already know the BCD of your chainring then you are ready to go. If not, you might have to either look it up or borrow/buy a tool that measures the BCD. For example, the Park Tools Chainring Diameter Gauge.
Another method of measuring the BCD is using a method suggest by Wolf Tooth. Wolf Tooth products has a great informative page on “How to measure the BCD.”
Another adapter we carry is the: Chainring Adapter BCD 130