The Shimano FC-6800 left crank arm fixing bolt is an original preload cap designed for Shimano Ultegra FC-6800 cranksets using the HOLLOWTECH II system. Its function is to set the initial bearing preload during installation of the left crank arm, which directly affects smooth, quiet and play-free crankset performance. Once the preload is correctly adjusted, the left crank arm is secured with two pinch bolts, helping ensure long term durability and proper operation.

The part is made from glass-fiber reinforced resin, offering a good balance of low weight and durability. Installation is carried out using the Shimano TL-FC16 tool or a compatible equivalent. It is a practical service component for road, gravel and training bikes equipped with compatible Shimano HOLLOWTECH II cranksets.

Part type: crank arm fixing bolt, preload cap
Intended use: left crank arm for Shimano Ultegra FC-6800
System: HOLLOWTECH II
Function: bearing preload adjustment
Material: glass-fiber reinforced resin
Installation tool: Shimano TL-FC16 or equivalent
Color: black
Quantity in package: 1 piece

Main compatibility: Shimano Ultegra FC-6800
Extended compatibility: selected Shimano HOLLOWTECH II cranksets including 105 FC-5800, FC-R7000, Tiagra FC-4700 and selected Sora and Claris versions

Advantages: precise bearing preload adjustment
Advantages: quiet and smooth crankset operation
Advantages: easy installation without excessive force
Advantages: original Shimano part with reliable fit

Application: road, gravel, training, servicing Shimano HOLLOWTECH II cranksets