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Upper Cup: 1 1/8"
Lower Cup: 1.5"
Steerer Tube: 1 1/8" - 1.5" tapered
Design: zero stack (ZS)
Bearings: semi-cartridge bearings (loose balls)
Upper Outer Diameter: 44 mm
Upper Inner Diameter: 28.6 mm
Lower Outer Diameter: 56 mm
Lower Inner Diameter: 40 mm
Top Cap: 4.2 mm
- Series: Comp
- Bearing Angle: 45°
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 zero stack (ZS), or (c) 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 (zero stack).
IS: Bearings that fit directly into a bonded or machined interface that is integrated into the frame (integrated).
Manufacturer Part Number:
- 1 x Ritchey Comp press-fit upper cup incl. bearing
- 1 x Ritchey Comp press-fit lower cup incl. bearing
- 1 x top cap
- 1 x Ahead cap with bolt and star nut
- 1 x compression ring
- 1 x crown race
- black/ZS44/28.6 - ZS56/40: 155 g