CANE CREEK 40 EXTERNAL Cup 1-1/8" Threadless Bike Headset EC34/28.6 - EC34/30 6061 T-6 aluminum internally relieved cups and cover to reduce weight High-quality, low friction face-seals on the crown races Dependable black-oxide, sealed bearings Weight 89g/98g S.H.I.S Upper: EC34 S.H.I.S. Clamp Diameter: 28.6 S.H.I.S Lower: EC34 Crown Race: 30.
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