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The Shimano Bottom Bracket BSA 122.5mm/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, trekking, hybrid, and older MTB frames that use square-taper or similar crank interfaces. Shimano’s proven bearing quality helps reduce friction and improve durability, so your cranks spin freely and consistently, ride after ride.
This bottom bracket is an excellent choice for refreshing a worn drivetrain or completing a new build with dependable components. The 122.5 mm axle length is commonly used with triple and some double cranksets, helping to achieve proper chainline and shifting performance. Thanks to its robust construction and sealed bearings, it offers good protection against dirt and moisture, reducing maintenance needs. Whether you are commuting, touring, or simply enjoying weekend rides, this Shimano BSA bottom bracket delivers the quiet, stable performance you expect from a trusted brand.
