Hollow-axle bottom brackets
Modern road and mountain bikes rely almost exclusively on hollow-axle bottom brackets with compatible cranksets. This means the bottom bracket itself has no axle and the axle is part of the crankset instead. Although all bottom brackets in this category are hollow, with no in-built axle, there are many different standards. This depends on your bike's bottom bracket shell: press fit, threaded and different types of each.
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Hollow Axle Bottom Brackets
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