Description

Left Crank Arm 170mm Silver Alloy – Square Taper JIS | 9/16″ Pedal Thread | OEM

Replacement 170mm left crank arm designed for bikes using a JIS square taper bottom bracket interface. Manufactured from durable aluminium with a clean silver finish, this crank arm is ideal for replacing damaged or worn crank arms on a wide range of MTB, hybrid, commuter, BMX, and road bikes.

Designed to fit standard cotterless JIS square taper bottom bracket axles, this crank arm accepts standard 9/16″ pedal threads and offers a strong, lightweight, and reliable replacement solution.

⚠️ Please Note:
The interface is commonly referred to as square taper, but the spindle shape is an offset diamond / rhombus shape, as shown in the product images. This is the most common design used on JIS cotterless crank systems.

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Key Features

• Left side crank arm only
• Durable aluminium construction
• Silver finish
• 170mm crank length
• Fits JIS square taper / cotterless bottom brackets
• Compatible with standard 9/16″ pedals
• Lightweight and strong
• OEM packaged

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Compatibility & Application

Suitable for bikes using:

• JIS square taper bottom bracket axles
• Cotterless crank systems
• Standard 9/16″ pedal threads

Commonly compatible with many:

• Mountain bikes (MTB)
• Hybrid bikes
• Road bikes
• Commuter bikes
• BMX bikes
• Exercise bikes

Please check your existing crank length and bottom bracket interface before purchase.

⚠️ Important:
This crank arm is designed for JIS square taper systems only and is not compatible with ISIS, Octalink, Hollowtech, or splined crank interfaces.

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Why Choose This Crank Arm?

This replacement crank arm provides a cost-effective solution for repairing bikes with damaged pedal threads, stripped crank interfaces, or crash damage. The aluminium construction keeps weight low while maintaining strength and durability for everyday riding.

Ideal for workshop repairs, bike restorations, or replacing worn original crank arms.

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Why Choose Hopkinson Cycles?

✅ Free UK Postage
✅ Family-Run Independent Bike Shop
✅ Expert Technical Advice
✅ Friendly Customer Support From Real Cyclists
✅ Fast Dispatch & Reliable Service
✅ Huge Range of Bike Parts & Bearings In Stock

At Hopkinson Cycles, we supply quality bicycle components, drivetrain parts, bearings, tools, and workshop essentials for MTB, BMX, road, commuter, and retro bikes.

🌐 Hopkinson Cycles
📧 info@hopkinsoncycles.com
📞 01924 274209
📍 Queen Street, Horbury, Wakefield, West Yorkshire, WF4 6LP