Hammer TH-877

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12mm ''Deep Cup'' design Nylon top cover Forged and CNC machined steel cups 5/32'' x 20 upper bearings 3/16'' x 20 oversized lower bearings 24.7mm stack height 149g Attributes Bear ing Grade Heavy duty caged ball Crown Race Diameter 30mm Headset Position Complete Headset Type External, Threadless Headset Weight 149g Lower Cup 34mm Primary Color Black S.H.I.S. EC34/28.6 | EC34/30 SHIS Lower EC34/30 SHIS Upper EC34/28.6 Stack Height 24.7 Steerer Tube 1-1/8'' Upper Cup 34mm Show more