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The Shimano Bottom Bracket BSA109.5mm/68mm is a reliable, threaded bottom bracket designed for smooth, efficient power transfer on a wide range of bikes. Using the classic BSA (English) thread standard and a 68 mm shell width, it is compatible with many road, urban, trekking, and older MTB frames that use this common interface. The 109.5 mm axle length is typically suited to double cranksets and provides a balanced chainline for crisp, consistent shifting performance.
Built with Shimano’s proven bearing technology, this bottom bracket is engineered for durability and low maintenance. Sealed cartridge bearings help keep out water and dirt, extending service life and reducing the need for frequent overhauls. Riders will appreciate the smooth rotation that improves pedaling efficiency and comfort on long rides or daily commutes. Whether you are refreshing a worn-out drivetrain or completing a classic build, this Shimano BSA bottom bracket offers dependable performance, straightforward installation with standard tools, and compatibility with many square-taper style cranksets that use this axle length.
