Acros ZS44/28.6 Upper Headset Cup

Item number: 80891

excl. shipping cost
to the delivery destination: USA

up to 10 days

Delivery to USA is not possible.

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ZS44/28.6 Upper Headset Cup - black/ZS44/28.6
ZS44/28.6 Upper Headset Cup - black/ZS44/28.6
ZS44/28.6 Upper Headset Cup - black/ZS44/28.6
ZS44/28.6 Upper Headset Cup - black/ZS44/28.6
ZS44/28.6 Upper Headset Cup - black/ZS44/28.6
ZS44/28.6 Upper Headset Cup - blue/ZS44/28.6
ZS44/28.6 Upper Headset Cup - red/ZS44/28.6
  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.89 / 5.00
The ZS44/28.6 upper headset cup from Acros, with a semi-integrated design for 1 1/8" head tubes and standard or tapered steerer tubes, is an all-round worry-free product. It impresses with double sealed angular contact ball bearings made of stainless steel, optimised headset grease and additional seals.

Use: Designed for 1 1/8" upper head tube diameters combined with standard 1 1/8" or 1 1/8" - 1.5" tapered forks.


Application: Road, Gravel, All Mountain, Cross Country, Enduro, City & Touring
Design: Zero Stack (ZS)
Upper Outer Diameter: 44 mm
Upper Inner Diameter: 28.6 mm
Head Tube: 1 1/8"
Steerer Tube: 1 1/8" , 1 1/8" - 1.5" tapered

Technical Information:

Material: aluminium
Bearings: Stainless steel angular contact ball bearing, double sealed
Upper Insert Depth: 7.7 mm
Upper Stack Height: 8 mm
Seals: 2 x double lip seal


- optimised headset grease
- double lip seal against moisture and dirt
- centring ring made of fibreglass-reinforced composite material with vulcanized seal
- long durability with minimal maintenance

Standardized Headset Identification System (S.H.I.S.):

In order to clarify and bring uniformity to a sea of headset standards, manufacturers Acros, Cane Creek, Hope, Race Face, Reset Racing and Ritchey have agreed upon using a shared nomenclature, which will likely include more participating companies in the future. This system takes into account a combination of frame and fork dimensions. Both the upper and lower part of the headset are marked by two alphanumeric identifiers. The first identifier indicates the type of headset (External Cup, Zero Stack, Integrated) and head tube diameter. The second identifier - separated from the first by a backslash - indicates the diameter of the steerer tube. When referring to a complete headset, the specifications of both upper and lower parts must be combined.


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 Numbers:

black: 22.02.605R6S
red: 22.04.605R6S
blue: 22.05.605R6S


Acros ZS44/28.6 Upper Headset Cup, consisting of:
- 1 x bearing cup with stainless steel bearings
- 1 x top cap
- 1 x Ahead cap
- 1 x star nut with aluminium bolt
- 1 x compression ring


  • black/ZS44/28.6: 43 g


in stock 2 to 7 days up to 10 days Out of stock inform me
  • black/ZS44/28.6

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