Compatible with MICRO SPLINE 12-speed cassettes, the SHIMANO DEORE XT freewheel rear hub incorporates SCYLENCE technology to improve ride stiffness and provide a quieter experience on the track.・More acceleration rapide amplifies the riding experience・Smaller spline diameter for a 10T sprocket by MICRO SPLINE・Easy installation and reliable performance on the track" Easy brake disc attachment with spline mount and locking ring-CENTER LOCK・Axis: 148 mm・Racking type: crossed by 3