This bottom bracket is the choice for a huge range of original equipment manufacturers (OEM) and bike builders because it-s inexpensive, robust, hard-wearing and smooth running. It features a sealed cartridge bearing for zero maintenance with an anodized aluminium barrel. Designed with phosphate coated cold-forged steel cups for strength on both sides meaning no cheap plastic cup for the non-drive side! When fixing up an old bike or building a new one, a good quality bottom bracket is the heart of your drivetrain. Get it right, do it once and everything else can be built on that solid foundation. The Square Taper Cartridge Bottom Bracket is a suitable replacement bottom bracket for bikes with the 68mm British / ISO thread bottom bracket shell. It comes in a variety of spindle lengths to suit different chain-lines.