A great solution for repairs on bicycles with External type BB cranksets where the bicycle frame has damaged or stripped threads in a 68mm English type bottom bracket.The YST BB-0901 (BB-2010) threadless unit threads to itself and has a bevelled cup for a snug fit.Lightweight alloy body with sealed bearings suitable for 68mm English type BB shells.Compatible with straight 24mm crankset axles (Shimano type) or stepped 24/22mm type axles (SRAM type) by using included extra spacer.Use hollow-tech II style BB tools to fit the 44mm Outer Diameter cups with 16 external notches