Bafang M620 M820 170mm ISIS Aluminum Crank Arm Set

This high‑performance mid‑mounted motor crank‑arm set is engineered for Bafang M620 and M820 mid‑drive e‑bike systems. Made of premium aluminum alloy, it ensures stable power transmission and smooth pedaling efficiency for mountain trail, gravel and cargo e‑bike riding. Adopted ISIS spline standard, it locks tightly with ISIS bottom bracket and maintains precise drivetrain alignment. 170 mm crank length balances pedaling torque and maneuverability for technical terrain.

Compatibility

✅ Perfect fit for Bafang mid‑drive motors: ‑ M620 (Equivalent Model: MM G510.750.C / MM G510.1000.C) ‑ M820 (Equivalent Model: MM G532.250.C)

✅ Standard: ISIS spline interface

✅ Crank Length: 170 mm

✅ Application: eMTB / eRoad / cargo e‑bike mid‑drive motor crank replacement, drivetrain upgrade

Precise Parameters

Package Includes

1 × Left Crank Arm 1 × Right Crank Arm

Only crank arms included; chainring, bottom bracket, motor, bolts and other e‑bike components are NOT included.

Key Features

✅ High‑performance Crank for Bafang M620 / M820 Mid‑Drive Systems: This crank arm set is designed for Bafang M620 and M820 mid‑drive systems, delivering reliable power transfer and smooth pedaling efficiency for mountain biking, gravel and cargo e‑bikes.

✅ Perfect Fit for ISIS Standard: Compatible with ISIS specification bottom brackets. The ISIS spline interface enables seamless assembly, secure mounting and optimal drivetrain alignment.

✅ 170 mm Optimized Crank Length: 170 mm crank length creates an ideal balance between power output and pedal stroke efficiency. Great for agile mountain trail riding and complex technical terrain.

✅ Lightweight & Strong Aluminum‑Alloy Construction: Crafted from high‑grade aluminum alloy. Strong structural rigidity with low weight, anti‑corrosion and wear‑resistant for long‑term off‑road and gravel use.

✅ Direct‑Replacement Spare Part: Suitable for replacing worn, bent or damaged original cranks on Bafang M620 and M820 mid‑drive e‑bikes, easy to install for shops and DIY users.

Specifications

• Product Name: Bafang M620 M820 170mm ISIS Aluminum Crank Arm Set
• Compatible Motors: M620(MM G510.750.C/1000.C), M820(MM G532.250.C)
• Crank Length: 170 mm
• Spline Type: ISIS spline
• Material: Aluminum alloy
• Package: 1 × Left Crank Arm + 1 × Right Crank Arm

Important Notes

Confirm your motor model and ISIS spline standard before ordering. This crank set only works for Bafang M620 / M820 mid‑drive motors. Chainring, bottom bracket, mounting screws, motor and frame shown in reference pictures are for demonstration only and not included. Minor color difference may exist due to lighting and screen display.

Ideal replacement drivetrain spare part for e‑bike repair stores, DIY retrofit enthusiasts and ebike wholesale distributors. Heavy‑duty ISIS crank arms for Bafang M620 / M820 e‑MTB & e‑Road mid‑motor builds.