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The Shimano Bottom Bracket BSA 122.5/73mm 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, it fits frames with a 73 mm bottom bracket shell and is matched to cranksets that require a 122.5 mm spindle length. This makes it a popular choice for many mountain, trekking, and hybrid bikes that use square-taper or compatible crank interfaces, offering a proven balance of durability, stiffness, and ease of maintenance.
Built with Shimano’s well-known attention to bearing quality and sealing, this bottom bracket is engineered to keep out dirt and moisture, extending service life even in wet or muddy riding conditions. The smooth-running bearings help reduce friction so more of your effort goes directly into forward motion. Thanks to its threaded BSA design, installation and replacement are straightforward for home mechanics and professionals alike, using common tools. Whether you are refreshing an older drivetrain or completing a new build, the Shimano Bottom Bracket BSA 122.5/73mm provides a dependable foundation for everyday riding and long-term performance.
