Replace worn, bent, or stripped crank arms on your Bafang mid drive with this pair of 170mm black aluminum crank arms, built specifically for the Bafang BBS01, BBS02, and BBSHD motor spindle. A direct bolt-on fit — no adapters, no guesswork. Want a high-shine look instead? See our custom polished 170mm BBS02 / BBSHD crank arms.

Why Riders Replace Their BBS02 / BBSHD Crank Arms

A BBSHD or BBS02 puts far more torque through the drivetrain than a standard bike, and the crank arms take a beating from rock strikes, drops, and over-torqued pedals. Stripped pedal threads or a loose, rounded taper are the most common reasons we see riders come in for new arms. This set restores a solid, creak-free connection between your pedals and your motor.

Features

• Direct fit for Bafang mid drives: BBS01, BBS01B, BBS02, BBS02B, and BBSHD
• 170mm length: the standard, most versatile crank length for commuting, trail, and cargo e-bikes
• Lightweight aluminum alloy with a durable black finish
• Sold as a pair – left and right arm included
• Standard 9/16" pedal threads – works with any standard adult bike pedal

Specifications

Installation Tips

• Remove your old arms with a standard crank puller.
• Clean the spindle taper before installing — no grease on a square taper interface.
• Torque crank bolts to spec and re-check after your first 50 miles.

Frequently Asked Questions

Will these fit a Bafang M600, M560, or Ultra motor?
No. These are for the BBS series (BBS01/BBS02/BBSHD) only. For M600/M560 motors, see our HPC 155mm CNC Performance Cranks (M600/M560); for Ultra motors, see the HPC 155mm CNC Ultra Drive Cranks.

Do these come with pedals?
No, pedals are sold separately. Any standard 9/16" pedal will fit.

Do these work with the Hi Power Cycles mid drive conversion kit?
Yes — our High Performance Mid Drive Conversion Kit uses the same BBS spindle, so these are a direct replacement.

Questions about fitment? Email sales@hpcbikes.com — our team in Simi Valley, CA is happy to help. Browse more cranksets and crank arms.