ACS MainDrive External Headset

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MainDrive External Headsets utilize forged steel cups, alloy tops and cap with sealed mechanism bearings. ACS MainDrive External Headset - 1-1/8", Black Color: Black Crown Race: 30 S.H.I.S. Stem Clamp Diameter: 28.6 Threadless Bearing Type: Cartridge S.H.I.S Lower: EC34 S.H.I.S Upper: EC34 Defined Color: Black Show more