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The Shimano Bottom Bracket BSA 122.5mm/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 most traditional threaded frames with a 73 mm shell width, making it a versatile choice for many mountain, trekking, and hybrid bikes. The 122.5 mm axle length is commonly used with triple and some double cranksets, providing a stable and durable interface between your frame and crank arms.
Built with Shimano’s proven bearing technology, this bottom bracket is engineered for long-lasting performance and low maintenance. Sealed cartridge bearings help keep out dirt and moisture, ensuring consistent, quiet rotation even in wet or muddy conditions. Whether you are refreshing an older bike, replacing a worn-out unit, or completing a new build with a dependable drivetrain core, this Shimano BSA bottom bracket offers an excellent balance of durability, compatibility, and value. It is an ideal upgrade for riders who want dependable performance without unnecessary complexity.
