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The Shimano Bottom Bracket BSA 68mm/121mm is a reliable, threaded bottom bracket designed for bikes that use the classic BSA (English) bottom bracket shell standard. With a 68 mm shell width and a 121 mm axle length, it is ideal for many city, trekking, and older MTB or road frames that require a longer spindle for proper chainline and crank clearance. Shimano’s proven bearing quality ensures smooth rotation and consistent performance, making it a solid choice for refreshing a worn-out drivetrain or completing a new build on a budget.
This bottom bracket is built to handle everyday riding, from commuting and leisure rides to light touring. The sealed bearing design helps keep out dirt and moisture, reducing maintenance and extending service life. Compatible with square-taper cranksets that match the 121 mm axle length, it offers straightforward installation with standard bottom bracket tools. Whether you are restoring a classic bike or keeping a trusted workhorse on the road, the Shimano Bottom Bracket BSA 68mm/121mm delivers dependable function, quiet operation, and the durability you expect from Shimano components.
