ACS MainDrive components are high quality, value-priced replacement parts for everyday use. MainDrive Threadless External Headsets include forged steel cups, alloy top and cap with sealed mechanism bearings.
Available in 5 anodized colors for 1 1/8" steer tubes.
S.H.I.S. IS42/28.6 | IS42/30
Available colors: Black, Blue, Red, Gold, and Purple.