Bike crank arms engineered to handle e-bike torque while offering a wide choice of lengths, the Alps2Ocean Bike Crank Arms aim to suit conversions and heavier riders. Riders needing a dependable upgrade after surgery or for a conversion can feel confident in stable pedalling. Will the spindle interface and chosen length match your bike and riding style?
⚡ At a Glance
- • Durability: Forged Alloy 6061 construction, high strength and hardness resists deformation
- • Best for: E-bike conversions and riders needing a robust replacement crank arm
- • Not ideal for: Users who require a spindle interface other than Diamond Hole
Forged Alloy 6061 crank arms available in ten lengths for tailored fit. Diamond Hole spindle interface, diameter 12cm, and clearly marked left and right arms simplify installation.
Strong, long-lasting pedalling - thanks to Forged Alloy 6061
Forged Alloy 6061 construction delivers high strength and hardness, reducing the risk of deformation under heavy load. The forging process aligns grain structure for greater fatigue resistance compared with cast alternatives.
Reliable under the higher torque of mid-mounted e-bike motors, so riders get consistent power transfer and fewer maintenance surprises. Suitable for riders needing a tough crank for daily use or conversions.
Adaptable fit for different riders - with 10 length options
Lengths available include 89mm, 102mm, 114mm, 127mm, 140mm, 152mm, 160mm, 165mm, 170mm and 175mm, covering a broad range of leg lengths and riding styles. Shorter cranks suit extreme sports and faster cadence, longer cranks increase leverage.
Choose a length that matches leg length, cadence preference or rehabilitation needs to improve comfort and pedalling efficiency. Clear size choices make tailoring fit straightforward for conversions or replacements.
Compatible with common mid-drive conversions - with Diamond Hole spindle interface
Diamond Hole spindle interface is specified, with a listed diameter of 12cm and separate left/right arms marked L and R for correct orientation. One pair is designated for e-bike use, while single arms can be used across other bike types.
Simplifies many mid-mounted motor swaps and conversions, including user-reported success on Bafang-style conversions. Labelling and included crank bolts reduce installation guesswork.
✨ The 4 Key Reasons for Alps2Ocean Bike Crank Arms
- Left and right labelling - Makes installation straightforward and avoids fitting errors
- Crank bolts included - Ready to fit without sourcing replacement hardware
- Single-arm flexibility - Allows use for MTB, road, folding, cargo and city bikes
- User-validated fit for conversions - Reported success on common mid-drive and Bafang projects
📋 Technical Details at a Glance
- Category: Sports bicycle crank arms
- Brand: Alps2Ocean
- Material: Forged Alloy 6061
- Available lengths: 89mm, 102mm, 114mm, 127mm, 140mm, 152mm, 160mm, 165mm, 170mm, 175mm
- Spindle interface type: Diamond Hole
❓ Frequently Asked Questions
Q: Are these crank arms suitable for e-bike conversions?
A: Yes, a pair is specified for e-bike use with mid-mounted motors and the Diamond Hole interface listed for spindle attachment.
Q: How do I choose the correct crank length?
A: Select from the ten available lengths (89mm to 175mm) to match leg length, cadence preference or the original crank length; confirm chosen size matches needs before purchasing.
Q: What is included in the package and are both arms supplied?
A: The package includes two crank arms (left and right) plus crank bolts; left and right arms are clearly marked L and R for correct installation.
🏆 Our Verdict
Suitable for riders converting to or repairing e-bikes and for anyone who needs a robust, size-specific crank arm replacement. Forged Alloy 6061 construction combined with a Diamond Hole interface and a wide range of lengths makes the offering especially useful for conversions and tailored fit. While individual needs vary, the durable build and inclusive hardware support long-term value for conversion and repair projects.
