104BCD Metal Chainring Adapter Spider

This chainring adapter spider is made of durable metal and features a precise 104mm bolt circle diameter (BCD). It measures approximately 38 teeth (38T) and weighs 125 g. Designed specifically for Bafang mid-drive motor systems, it ensures mechanical compatibility with BBS01, BBS02 and G340 series electric bike motors. Installation is straightforward — it bolts directly onto the motor’s crank interface without modification. Ideal for e-bike owners upgrading or replacing worn chainrings while retaining original motor functionality. Note: Appearance may vary slightly between production batches; such variations do not impact performance or fit.