Bottom brackets (or BB) generally consist of a spindle, cups and bearings; they connect the bike’s cranks to its frame and allow them to rotate.  Prices do not include postage, contact if you’re interested.

More in stock, just ask if you can’t see what you’re looking for or are unsure – see also Sheldon Brown info.  All the BBs here are English threaded square taper fitment, in very good used condition unless stated otherwise, and are listed in order of price – high to low.