The S-1 headset uses the same design as the S-8, with only minimal concessions.The S-1 utilizes even more affordable, yet ultra durable steel cups. The S-1 shares the overhanging cup/cover design of the S-8, which keeps contaminants from reaching the bearings. This overhanging "treacherous path" feature is repeated with the lower cup/crown race. All Cane Creek headsets, including the S-1, feature design details such as an undercut transition and stepped insertion for ease of assembly into frames; and are compatible with Cane Creek Interlok spacers. Classic: fits in a traditionally designed head tube and utilizes external bearing cups. Material: cold forged steel cups. Steel crown race with integrated rubber seal. Replaceable sealed cartridge bearings. Neoprene bearing seals. Lower stack height: 12.3mm. Upper stack height: 15.1mm. Total stack height: 27.4mm. Fits 1" 1/8 aheadset diameter tubes.