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· The ZS-2 is of the same ZeroStack design which features very low profile aluminium cups that "hide" down in the head tube of the bicycle's frame. · compatible only with specifically machined head tubes. · The ZS-2 uses sealed cartridge bearings for solid durability. · All 1-1/8" ZS headsets are compatible with Cane Creek Interlock spacers. · Product Weight: 4.75 oz |