When precision and reliability are non-negotiable, the Shimano Crank Arm Fixing Bolt delivers dependable performance for critical crank assembly. Designed as a genuine Shimano replacement part, this fixing bolt is specifically engineered for left crank arm installation on DXR FC-MX71 single chainsets and is fully compatible with the DXR FC-MX70 series — denoted as an “A” match, ensuring identical material quality, dimensions, and finish.
Constructed from high-grade reinforced plastic, this lightweight yet durable component plays a vital role in correctly preloading the crank arm before final tightening, ensuring optimal crank interface alignment and preventing premature wear or loosening. Shimano’s proprietary design allows for easy installation with the appropriate Shimano crank arm fixing bolt tool, making this an essential item for maintenance, repairs, or crank swaps.
Even when the exact replacement is unavailable, this fixing bolt remains cross-compatible with select Shimano models such as the SLX FC-M660-9, offering functional interchangeability without compromising fit or performance.
Key Features:
Genuine Shimano Replacement Part: Ensures precise compatibility and long-term reliability
Left Crank Arm Preload Function: Crucial for properly seating and aligning the crankset
“A” Match Compatibility: Exact material, size, and finish match for DXR FC-MX71 & FC-MX70
Lightweight Reinforced Plastic: Combines strength with minimal added weight
Easy Installation: Designed for use with Shimano’s dedicated crank arm fixing bolt tool
Cross-Compatible: Can be used with SLX FC-M660-9 if exact match is unavailable
Specifications:
• Application: Left crank arm assembly
• Material: Reinforced Plastic
• Compatibility:
✔ Shimano DXR FC-MX71 (primary fit)
✔ Shimano DXR FC-MX70 (“A” match)
✔ Shimano SLX FC-M660-9 (compatible alternative)
Why It Matters:
A small part with a big job — the crank arm fixing bolt ensures your Shimano crankset remains tight, aligned, and free from creaks or shifting under load. Whether you’re a BMX racer on DXR cranks or a trail rider running SLX, this original Shimano component restores factory performance and ensures peace of mind.
Note: Always torque according to Shimano’s specifications and follow the crankset's installation guide for optimal results.
