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

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

Upgrade or replace your worn-out crank arms with BUCKLOS's high-strength AL6061 aluminum alloy crank arms. Available in three lengths and multiple hole configurations, these crank arms are engineered for smooth, stable power transfer on e-bikes, indoor spinning bikes, mountain bikes, and road bicycles. Easy to install and built to last. Made in Mainland China.

Key Features

• Premium AL6061 Aluminum Alloy – High hardness construction for long-lasting durability and strength under demanding riding conditions.
• Three Length Options – Choose from 152 mm, 170 mm, or 175 mm (length = distance between the two holes) to match your bike's geometry perfectly.
• Multiple Hole Shapes – Available in Square, Diamond, and Spline hole configurations to fit a wide variety of bottom bracket standards.
• Two Configuration Options – Order as a Left Crank Arm only, or as a complete Left + Right Crank Arm set for a full replacement.
• Stable Power Transmission – Precisely machined for consistent, wobble-free pedaling efficiency on every ride.
• Easy Installation – Straightforward fit designed for quick, hassle-free mounting without special tools.
• Versatile Compatibility – Ideal for e-bikes, indoor spinning bikes, mountain bikes, and road bicycles.

Specifications

Why Choose BUCKLOS Crank Arms?

Whether you're restoring a vintage road bike, maintaining your electric commuter, or keeping your indoor spinning bike in top shape, BUCKLOS crank arms deliver the reliability you need. The robust AL6061 alloy resists flex and fatigue, while the multiple hole-shape options ensure you'll find a compatible fit for your existing bottom bracket. Stop riding on worn or damaged cranks — swap them out quickly with BUCKLOS and get back on the road with confidence.

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Frequently Asked Questions

Q: What does the crank arm length (152 mm, 170 mm, 175 mm) refer to?

A: The length refers to the distance between the two mounting holes on the crank arm — the bottom bracket spindle hole and the pedal axle hole. Choosing the correct length ensures proper fit and comfortable pedaling cadence for your body and bike frame. 170 mm is the most common size for standard adult bicycles.

Q: Which hole shape should I choose — Square, Diamond, or Spline?

A: The hole shape must match your bottom bracket spindle. Square taper is the most traditional and widely used standard; Diamond (also a taper variant) suits specific bottom bracket designs; and Spline fits ISIS or similar splined bottom brackets. Check your existing bottom bracket spindle or consult your bike's manual before ordering.

Q: Are these crank arms compatible with my electric bike or indoor spinning bike?

A: Yes! The Left + Right crank arm set is specifically noted as suitable for e-bikes and indoor spinning bikes. Make sure to verify that your bottom bracket spindle hole shape and crank arm length match your bike's requirements before purchasing.

Q: Can I buy just one (left) crank arm, or do I need to buy a pair?

A: Both options are available. You can purchase a Left Crank Arm only for a single-side replacement, or order the Left + Right set for a complete crank arm upgrade. Select the configuration that fits your needs at checkout.

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.