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For 1 1/8" steerer tubes and standard 1 1/8" head tubes.
Upper Bearing Cup: 1 1/8"
Lower Bearing Cup: 1 1/8"
Head Tube: 1 1/8"
Construction: semi-integrated (ZS)
Bearings: sealed cartridge
Cap: 4.2 mm
Standardized Headset Identification System (S.H.I.S.):
The Standardized Headset Identification System (S.H.I.S.) creates a common language for describing modern bicycle headsets. The system provides comprehensive and scalable headset fitment information in a standardized format; making it easy to communicate headset requirements based on frame and fork interfaces.
The system addresses the critical interface dimensions required to fit a fork to a frame, as well as bearing location/cup type. To determine fit, four dimensions are needed: (1) stem-clamp diameter of fork, (2) crown-race seat diameter of fork, (3) head-tube top inside diameter, and (4) head-tube bottom inside diameter. Bearing location and cup-type are identified as (a) external cup (EC), (b) semi-integrated or ZeroStack (ZS), or © integrated (IS).
EC: Bearings contained within cups that are located outside of the frame (External Cup).
ZS: Bearings contained within pressed-in cups where the cup and bearings rest inside the frame (ZeroStack).
IS: Bearings that fit directly into a bonded or machined interface that is integrated into the frame (Integrated)
tpi threads per inch
ZS44/28.6 - ZS44/30:
- Construction: semi integrated (ZS)
- Head Tube: 28.6 mm
- Crown Race: 30 mm
- Steerer Tube (Frame Inner Diameter): 44 mm
- Bearing Angle: 45°
Manufacturer Part Number:
- 2 x Ritchey Comp Press-Fit bearing cups, upper and lower, bearing included
- 1 x bearing cover
- 1 x top cap, including bolt and star nut
- 1 x compression ring
- 1 x crown race
- black/ZS44/28.6 - ZS44/30: 135 g