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The Shimano Bottom Bracket BSA 109mm/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, urban, trekking, and older MTB frames that use square-taper or similar crank interfaces in this spindle length range. 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 trusted components. The sealed cartridge design helps keep out water and dirt, reducing maintenance needs and extending service life, especially for riders who commute year-round or ride in mixed weather conditions. Installation is straightforward with common bottom bracket tools, making it suitable for home mechanics as well as professional workshops. Whether you are restoring a classic bike or maintaining your daily rider, this Shimano BSA bottom bracket offers dependable performance and long-term value.
