To install, first place the sleeve into the bottom bracket shell of your bicycle frame. The sleeve is designed to adjust automatically to fit the diameter, ensuring a snug and reliable fit. This innovative feature that the remains securely in place, providing optimal performance and reducing the risk of any unwanted movement or noise during rides. The sleeve's compatibility with various sizes makes it a versatile choice for cyclists looking to upgrade or maintain their bike's bottom bracket system. With this sleeve, you can enjoy a smoother and more efficient cycling experience. Features -Color:Silver -Material:Aluminium Alloy -Size:2.50X2.50X1.00cm/0.98X0.98X0.39in -High versatility: compatible with various bottom bracket conversion sleeves, offering flexibility for different bike models and upgrades - : constructed from durable materials that provide exceptional durability and resistance to corrosion -Precision machining: expertly machined to ensure a fit and reliable performance, contributing to the bike's overall stability -Easy to use installation: designed for easy installation, allowing users to quickly and efficiently set up the conversion sleeve without special help -Enhanced bike performance: the bottom bracket conversion sleeve improves the bike's efficiency and comfort, leading to a more enjoyable riding experience Package list: 1 x Bicycle Bottom Bracket Adapter