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The Shimano Bottom Bracket BSA 121mm/68mm is a reliable, threaded bottom bracket designed for bikes that use the classic BSA (English) bottom bracket shell. With a 68 mm shell width and a 121 mm axle length, it is ideal for many square-taper cranksets found on city, trekking, touring, and older mountain bikes. Shimano’s proven bearing quality ensures smooth rotation and efficient power transfer, helping you pedal more comfortably and confidently on every ride.
This bottom bracket is built to handle everyday use, from commuting through all seasons to relaxed weekend rides. The sealed cartridge design helps keep dirt, water, and grit away from the bearings, reducing maintenance needs and extending service life. Thanks to the standard BSA threading, installation and replacement are straightforward for most home mechanics and bike shops. Whether you are refreshing a well-loved bike or completing a drivetrain overhaul, the Shimano Bottom Bracket BSA 121mm/68mm offers a dependable, cost-effective solution that restores stiffness and smoothness to your pedaling.
