Description: 【Compatibility】: Specifically designed for CUES series FC-U4010/FC-U6000 cranksets, this adjustment ring is essential for fine tuning the clearance between the crank and bottom bracket, ensuring optimal performance and longevity of your bike components 【Easy Installation】: The Crank Bottom Bracket Adjuster can be easily adjusted using a 2.5 mm hex wrench. Simply insert the wrench through the designated hole to rotate and adjust, making it user friendly even for those with minimal mechanical experience 【Quality Material】: Crafted from quality aluminum alloy, this crank preload adjustment ring offers good durability and resistance to wear, providing reliable performance in various riding conditions 【Fit】: With an approximate diameter of 46 mm, this Bottom Bracket Preload Adjuster is engineered fit seamlessly with your crankset, ensuring a secure and stable connection 【Practical Accessary】: Each purchase includes 1pc preload adjustment ring, good for adjusting clearance between crank and bottom bracket Specification: Material: Aluminum Alloy Size Chart: Diameter: 4.6 cm/1.81 inch Inner Diameter: 2.45 cm/0.96 inch Package Includes: 1 Crank Preload Adjuster Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.