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The Shimano Bottom Bracket BSA 126mm/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 and offers a secure, creak-free interface between your frame and crankset when installed correctly. The 73 mm shell width is common on many mountain and trekking frames, while the 126 mm axle length is suited to specific crank and chainline requirements, helping you achieve precise drivetrain alignment.
Built with Shimano’s proven bearing technology, this bottom bracket is engineered for durability and consistent performance in all weather conditions. Sealed bearings help keep out water and dirt, reducing maintenance needs and extending service life. Whether you are refreshing an older bike, completing a drivetrain overhaul, or building up a dependable commuter or touring rig, this BSA bottom bracket provides a solid, cost-effective foundation. It is ideal for riders who value straightforward installation, compatibility with widely used standards, and the long-term reliability associated with Shimano drivetrain components.
