BUCKLOS Aluminum Bike Crank Arms 152mm 170mm 175mm MTB Road

BUCKLOS Aluminum Alloy Bike Crank Arms – 152mm / 170mm / 175mm

Upgrade or restore your ride with the BUCKLOS Aluminum Alloy Bicycle Crank Arms. Engineered from high-strength AL6061 aluminum alloy, these crank arms deliver a winning combination of low weight, high rigidity, and stable power transmission — whether you're tackling mountain trails, spinning on an indoor bike, or cruising on a road bicycle. Available in three lengths (152mm, 170mm, 175mm) and multiple interface shapes, finding the perfect fit for your drivetrain has never been easier.

Made in Mainland China.

Key Features

• Premium AL6061 Aluminum Alloy – High hardness and excellent strength-to-weight ratio for dependable, long-lasting performance
• Three Length Options – 152mm, 170mm, and 175mm to suit different rider builds and riding styles
• Multiple Interface Shapes – Square, Diamond, and Spline hole configurations for broad compatibility
• Available as Left-Only or Left + Right Set – Choose exactly what you need for your repair or build
• Stable Power Transmission – Precision machining ensures consistent pedaling efficiency with minimal flex
• Easy Installation – Drop-in replacement design makes swapping out worn or damaged crank arms straightforward
• Versatile Use – Compatible with mountain bikes (MTB), road bicycles, e-bikes, and indoor spinning bikes

Specifications

Perfect Replacement Part

Whether a crank arm has cracked, stripped, or simply worn out, these BUCKLOS crank arms are an ideal direct replacement. The left + right set is especially recommended for e-bikes and indoor spinning bikes where symmetrical load distribution matters most.

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Frequently Asked Questions

Q: Are these BUCKLOS crank arms compatible with my mountain bike?

A: Yes! The BUCKLOS aluminum crank arms are designed for broad compatibility with mountain bikes (MTB), road bicycles, e-bikes, and indoor spinning bikes. They are available in Square, Diamond, and Spline hole interfaces to match most standard bottom bracket spindle types. Always confirm your bottom bracket interface and required crank arm length (152mm, 170mm, or 175mm) before ordering.

Q: Should I buy the left-only crank arm or the left + right set?

A: If only one arm is damaged, the left-only option is a cost-effective solution. The left + right crank arm set is recommended for e-bikes and indoor spinning bikes — or any time you want perfectly matched arms for balanced performance. Both options are available in all three lengths.

Q: What material are these bike crank arms made from?

A: These crank arms are precision-made from AL6061 aluminum alloy — a high-strength, lightweight material widely used in quality cycling components. It offers excellent durability, corrosion resistance, and a stable, efficient power transfer from pedal stroke to drivetrain.

Q: How difficult is it to install these crank arms?

A: Installation is straightforward. These crank arms are designed as direct replacements, so you simply remove the worn arm, align the new BUCKLOS crank arm with your bottom bracket spindle interface (Square, Diamond, or Spline), and tighten securely. Basic bike tools are all that's needed. A small amount of assembly grease is recommended for a smooth fit.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.