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The Shimano Bottom Bracket BSA 109.5/68mm 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, and urban frames that use square-taper or compatible cranksets in this spindle length. 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 an older bike, completing a drivetrain overhaul, or building up a dependable commuter. The 109.5 mm axle length is a common specification that works with many double cranksets, helping you achieve proper chainline and crisp shifting. Thanks to its sealed cartridge design, it offers good protection against dirt and moisture, reducing maintenance needs and extending service life. Whether you are upgrading a worn-out unit or finishing a new build, the Shimano Bottom Bracket BSA 109.5/68mm delivers the dependable performance and straightforward installation mechanics appreciate.
