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For 1 1/8" head tubes combined with 1 1/8" steerer tubes.
Upper Cup: 1 1/8"
Lower Cup: 1 1/8"
Steerer Tube: 1 1/8"
Design: standard Ahead (EC)
Material: aluminium (6061 AL)
Bearings: low resistance, stainless steel industrial bearings, sealed
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).
EC34/28.6 - EC34/30:
- Design: standard ahead (EC)
- Steerer Tube: 28.6 mm
- Steerer Tube Crown Race: 30 mm
- Head Tube (Frame Inner Diameter): 34 mm
- 2 x KCNC upper and lower bearing cups, incl. bearings
- 1 x KCNC cover cap
- incl. bolts and nuts