Maintain the elite precision and performance of your Shimano Dura-Ace drivetrain with the original crank arm fixing bolt designed specifically for left crank arm assembly. Tailored for the FC-7900 and FC-9000 cranksets, this small yet essential component ensures correct preloading of the bottom bracket spindle interface, delivering a tight, creak-free, and secure fit that withstands the demands of high-performance road cycling.

Crafted from high-strength polymer, this lightweight crank arm fixing bolt reduces unnecessary weight while retaining the mechanical integrity required to hold your crank arm in place during intense torque loads. Shimano’s proprietary design simplifies the crank installation process and ensures compatibility with the brand’s standard crank tools for easy service.

This component is available in two precise variants to match specific crankset thread depths:

• A-Type (Y1KY08000): Features an 8.5mm thread length and is designed for crank arms with an 8mm inner thread length, such as the FC-7900 and select FC-9000 series configurations.

• B-Type (Y1N218000): Features a 16mm thread length and is intended for 13mm inner thread length cranks, offering better engagement for deep-threaded FC-9000 models.

Shimano recommends using the correct bolt type for your crankset to ensure maximum stability and mechanical performance. This bolt serves as a preload adjuster and must be properly torqued before securing the main crank bolts during assembly.

Key Features:

• Genuine Shimano Part: Engineered for precise fit with FC-7900 and FC-9000 cranksets

• Crank Arm Preload Function: Ensures correct bearing compression and crank arm alignment

• A-Type & B-Type Compatibility:
   • A-Type (Y1KY08000): 8.5mm thread for 8mm crank threads
   • B-Type (Y1N218000): 16mm thread for 13mm crank threads

• High-Durability Polymer Construction: Lightweight yet strong for long-term use

• Tool-Compatible Design: Designed for seamless integration using Shimano crank tools

• Included in Package: 1x Crank Arm Fixing Bolt

Applications:

• Shimano Dura-Ace FC-7900

• Shimano Dura-Ace FC-9000

• Ensure you match the thread depth of your crankset to the correct fixing bolt type.