Description Wide compatibility and upgrade potential This hub body is designed for Giant, Trek, and other major bicycle brands, offering a general fit for various wheel models to upgrade your ride. 811 speed support for smooth gear transitions Engineered to accommodate 8, 9, 10, and 11speed cassettes (mountain use), delivering smooth and reliable gear changes for improved cycling performance. Durable steel construction with precise sizing Made from robust steel with a sleek black finish (M16x49.2mm). This hub body withstands rugged riding conditions while weighing just 165 g. Precision engineering for reliable power transfer Exact dimensions and meticulous design guarantee seamless integration with your existing wheel setup for consistent and trustworthy power transfer. Use scenarios Replacing a worn hub body on a bike with a Giant or Trek wheelset to restore reliable operation and compatibility with modern cassettes. Upgrading a mountain bike with 811 speed drivetrain to improve shifting performance across varied terrain. Replacing hub bodies across multiple bikes due to broad compatibility with major brands and standard dimensions, simplifying maintenance and upgrades.