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Upper Cup: 1"
Lower Cup: 1"
Steerer Tube: 1"
Design: external cup (EC)
Bearings: cartridge bearings (titanium-coated)
Upper Outer Diameter: 30 mm
Upper Inner Diameter: 25.4 mm
Lower Outer Diameter: 30 mm
Lower Inner Diameter: 26 mm
- Series: WCS (World Championship Series)
- Sealed bearings
- Total Stack Height: 28 mm
- 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 WCS Logic upper cup incl. bearings
- 1 x Ritchey WCS Logic lower cup incl. bearings
- 1 x top cap
- 1 x Ahead cap with bolt and star nut
- 1 x compression ring
- 1 x crown race
-black / EC30/25.4 - EC30/26 : 94 g