ACS Maindrive Headsets

Black Mountain Bicycles Verified independent store

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Forged steel cups, alloy tops and cap with sealed bearings Available for 1" (25.4mm) or 1-1/8" (28.6mm) EC (traditional cup) applications Color Black Bearing Type Cartridge Crown R ace 30 Defined Color Black S.H.I.S Upper EC34 S.H.I.S. Stem Clamp Diameter 28.6 Threadless S.H.I.S Lower EC34 Show more