Bottom bracket
A sub-assembly located inside the bottom of the bike frame, consisting of bearings, bearing surfaces and an axle to which the cranks attach. In a ‘cartridge bottom bracket’, the bearings are encased in a sealed metal tube.
A sub-assembly located inside the bottom of the bike frame, consisting of bearings, bearing surfaces and an axle to which the cranks attach. In a ‘cartridge bottom bracket’, the bearings are encased in a sealed metal tube.