104BCD Chainring Spider Adapter, Aluminum Alloy Spider for Bafang Mid‑Drive Motor M500 (MM G520.250.C) M510 (MM G522.250.C) M600 (MM G521.250/500.C) M620 (MM G510.1000.C), MTB E‑bike Replacement Part

104BCD Chainring Spider Adapter for Bafang Mid‑Drive Motor

This 104BCD chainring spider adapter is engineered for Bafang mid‑drive e‑bike motors. It delivers seamless integration with Bafang M‑series mid‑drive systems, offering reliable performance for mountain‑bike e‑bikes under demanding off‑road riding conditions. Constructed from durable high‑strength aluminum alloy, it provides excellent strength‑to‑weight ratio, great wear‑resistance and robust power transmission for long‑term heavy‑load riding.

Compatibility

✅ Perfect fit for Bafang mid‑drive motors:

• M500 (Equivalent Model: MM G520.250.C)
• M510 (Equivalent Model: MM G522.250.C)
• M600 (Equivalent Model: MM G521.250/500.C)
• M620 (Equivalent Model: MM G510.1000.C)

✅ Compatible with standard 104BCD bolt‑circle‑diameter chainrings

✅ Application: Mountain e‑bike, off‑road terrain, e‑MTB retrofit & upgrade projects

Precise Parameters

Package Includes

1 × 104BCD Chainring Spider Adapter

Only the above package content, other products are not included.

Key Features

✅ Universal Fit for Bafang M‑Series Mid‑Drive Motors: Precisely machined to match Bafang M500, M510, M600, M620 mid‑drive motor mounting interface, ensures seamless integration with e‑bike power systems for enhanced reliability.

✅ High‑Strength Aluminum Alloy Construction: Premium aluminum alloy material provides outstanding strength‑to‑weight ratio, anti‑deformation and wear‑resistant performance under heavy torque and rough off‑road riding conditions.

✅ Optimized for Mountain Bike Applications: Designed specifically for e‑MTB and off‑road terrain. Delivers robust power transfer and smooth chain engagement for demanding trail and mountain cycling environments.

✅ Standard 104BCD Compatibility: Adopts widely‑used 104 BCD bolt‑circle‑diameter specification, works with most standard 104BCD bicycle / e‑bike chainrings, supports flexible chainring upgrade choices.

✅ Direct Replacement & Easy Installation: Exact mounting geometry for direct swap‑in, simple assembly for e‑bike repair workshops and DIY e‑bike builders.

Specifications

• Product Name: 104BCD Chainring Spider Adapter
• BCD: 104mm
• Material: High‑strength Aluminum Alloy
• Compatible Motors: Bafang M500(MM G520.250.C), M510(MM G522.250.C), M600(MM G521.250/500.C), M620(MM G510.1000.C) Mid‑Drive Motors
• Suitable Use: Mountain E‑bike / e‑MTB off‑road riding
• Package: 1 × Chainring Spider Adapter

Important Notes

Please verify your Bafang mid‑drive motor model (M‑series and corresponding MM G‑code) before placing your order to prevent incompatibility. Minor color differences may appear due to lighting conditions and screen display variations. Chainring, crank arm, motor and other e‑bike components shown in reference images are NOT included. This spider only fits 104BCD spec chainrings, please double‑check your chainring BCD specification.

Ideal spare parts for e‑bike repair stores, DIY retrofit enthusiasts and ebike wholesale distributors. Reliable 104BCD spider upgrade solution for Bafang M‑series mountain e‑bike projects.