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- Online since 1998
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Application: Cross Country, Road, City & Touring
Upper Cup: 1 1/8"
Lower Cup: 1 1/8"
Steerer Tube: 1 1/8"
Design: zero stack (ZS)
Material: aluminium 2000
Bearings: angular contact cartridge bearings (steel)
Upper Insert Depth: 9.4 mm
Lower Insert Depth: 9.4 mm
Upper Stack Height: 16.5 mm
Lower Stack Height: 5.8 mm
Upper Outer Diameter: 44 mm
Upper Inner Diameter: 28.6 mm
Lower Outer Diameter: 44 mm
Lower Inner Diameter: 30 mm
Seals: R2 rubber lip seal
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).
Use the AH-T DIY to press in your headset.
Manufacturer Part Number:
- 1 x Acros AZ-44E upper bearing cup, incl. steel bearings
- 1 x Acros AZ-44E lower bearing cup, incl. steel bearings
- 1 x headset dust cap
- 1 x Ahead cap
- 1 x star nut with M6 x 30 bolt
- 1 x compression ring
- 1 x crown race
-black / ZS44/28.6 - ZS44/30 : 96 g