The DUO 44/56 Zero Stack (ZS) headset is low profile, lightweight and designed to provide exceptional steering. Features include Sealed cartridge bearings with Alloy cups to fit headtubes with 44mm upper and 56mm lower bore diameters. An extra lower fork crown race is included to fit both 39.8 and 30mm Steer tube diameters.
Note: The ZS style headset is also known as “Semi-Integrated”
Bottom: ZS56/39.8 & 30