This complete e-bike crank and pedal assembly is an ideal replacement and upgrade kit for mid-mounted electric bicycles.
The AC-08 crank arm is forged from high-strength aluminum alloy with precision square taper interface. Matching wide aluminum flat pedals deliver stable pedaling support. Whether you need to replace worn original cranks or upgrade your e-bike for better riding experience, this set is a reliable choice for commuting, off-road and long-distance cycling.
Core Advantages
✅ High Strength Aluminum Alloy Construction
Solid forged aluminum crank arms, lightweight yet load-bearing. Waterproof surface treatment, anti-corrosion and rust resistant, suitable for all-weather outdoor riding.
✅ 45° Square Taper Interface
Standard 16.7mm square hole, precisely manufactured. Stable connection with mid-drive motor spindles, effectively avoiding crank loosening during riding.
✅ Wide Platform Anti-Slip Pedals
Oversized pedal surface: 125mm × 100mm. Equipped with embedded stainless steel anti-slip pins. Maximizes friction to prevent feet slipping off pedals during intense pedaling. Built-in reflectors improve safety for night riding.
✅ Wide Compatibility for Mid-Drive E-Bikes
Works with mainstream mid-drive motor systems:
Bafang M300 / M400, Shimano E5000 / E6000, Yamaha PW-SE / PW-TE, Panasonic mid drive motors.
Suitable for electric mountain bikes, folding e-bikes, hybrid bikes and road bikes.
✅ Simple Installation
Standard dimensions match most e-bike mid motors. Direct replacement for old crank arms, no frame modification required.
Detailed Specifications
AC-08 Crank Arm
Model: AC-08
Material: Forged Aluminum Alloy
Effective Crank Length: 170 mm (6.69 inch)
Overall Length: 205 mm / 210mm
Interface: 45° Square Taper
Square Hole Inner Size: 16.7 mm
Pedal Mount Hole Diameter: 12.8 mm
Color: Matte Black
Single Crank Weight: 0.41kg
Flat Platform Pedals
Size: 125mm(L) × 100mm(W) × 26mm(T)
Spindle Thread: Standard 9/16" bicycle thread
Material: Aluminum Alloy Body + Stainless Steel Anti-slip Studs
Built-in safety reflectors
Left / Right marked for easy identification
Package Options
Option 1: A Pair of Crank Arms Only
Includes left crank arm + right crank arm (pedals NOT included)
Option 2: Complete Set (Crank Arms + 1 Pair Pedals)
Includes left & right crank arms + one pair aluminum flat pedals
Note: Installation tools, chainring and e-bike motor are NOT included.
Installation Tips
Confirm your mid-drive motor adopts standard 45° square taper interface before ordering.
Distinguish Left / Right crank arms clearly during installation.
Tighten crank fixing screws and pedal threads to prevent loosening during riding.
After long-distance riding, regularly check and re-tighten fasteners.
Compatibility Reminder
This crank fits square taper mid-drive motors. It is NOT compatible with splined crank interfaces.
If you are unsure whether it fits your e-bike, please send photos of your original crank spindle for verification before purchase.
Who This Product Is For
Perfect for DIY e-bike builders, riders replacing damaged factory cranks, and cyclists looking to upgrade narrow original pedals to wider platform pedals for more comfortable all-day riding. Suitable for daily commuting, trail riding and urban cycling.
Certification
FAQ Section
Q: Will these cranks fit my Bafang M400 mid drive motor?
A: Yes, the AC-08 square taper crank is fully compatible with Bafang M300 and M400 mid-mounted motors.
Q: Are the pedals included?
A: We provide two purchase options: crank arms only, or full set with pedals. Please select the variant you need on the product page.
Q: Does it work for folding electric bikes?
A: Yes, compatible with most folding e-bikes equipped with matching square taper mid drive motors.
Q: Are pedals marked left and right?
A: Pedals are clearly marked L (Left) and R (Right) with standard bicycle thread direction.
Q: Can these pedals be used for mountain bike off-road riding?
A: Yes. The stainless steel anti-slip pins provide excellent grip even on bumpy trails and wet conditions.