• 1-1/8", semi-cartridge bearing types • For 49mm OD Head Tube • 1-1/8" steerer • Alloy Top Cover • Cr-Mo steel cups with integrated semi cartridge bearings • Stack Height 18.7+3=21.7mm • Weight - 124.3 g HS SXE(I/E) 16.2mm alloy 1-1/8 headset