AheadSet ZS Zerostack Internal 1 1/8in Threadless Bike Headset

The AheadSet Zerostack features cups and cones that work together with a simple O ring to seal out contaminants and increase the headset's longevity. LubeAlarm seals audibly alert the rider when more grease is needed in the headset, extending headset life Features 1 18 high complement caged ball bearings The cone and crown race are the same part creating mirror top and bottom cup assemblies Bearing Type: Cup and Cone Lower Stack Height: 5 mm S.H.I.S Lower: ZS44 S.H.I.S Upper: ZS44 Upper Stack Height: 10 mm Weight: 130 g