Adjustable Cup
From bikelopedia
Overview[edit | edit source]
Sheldon Brown's Entry[edit | edit source]
In a conventional threaded bottom brackets, the left cup is adjustable, and its position is secured by a lockring. The right cup is not adjustable, its position is fixed, usually by a shoulder which presses against the side of the bottom-bracket shell. The fixed cup is screwed all the way into the bottom bracket, until the shoulder runs up against the end of the bottom-bracket shell. The bearings of a cup-and-cone bottom bracket are adjusted by screwing the adjustable cup in or out of the bottom bracket shell, and the adjustment is secured by the lockring. [1]