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Like most bicycle components cartridge bottom brackets are highly standardized. Almost all bikes with threaded bottom bracket shells are ISO standard: 1.37inch x 24 threads per inch, drive side is left hand threaded. The ISO standard is also known as 'English' or 'BSA'. Obviously this is what your frame has. There are two other parameters you need to know. ...


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BSA 68 is the bottom bracket shell type. BSA determines the threads an shell length, so this needs to match the frame, so it should be the same as old BB. 107 is axle length. This is determined by the crankset, so you need to find the specs for the crankset you want and take the number there. Track bikes have standard chainline, so unless you want to ...


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