Square Taper Bottom Brackets 102-120 mm (Campagnolo Taper)Our Classic bottom bracket uses our heat treated stainless steel spindle. This bottom bracket is intended for applications demanding maximum durability and minimum flex. It is offered with our Standard PWX03 bearing. The bottom bracket is offered with a 63 68, 68 73 and 100 mm aluminum shell. For those looking for a low drag bearing option we offer our PWN93 Carbonyte bearing upgrade. Our Pro bottom bracket uses our proprietary titanium spindle. This