Hope ZS49/28.6 4 Headset Top Assembly

A high-quality product: the ZS49/28.6 4 Headset Top Assembly by Hope

The Hope ZS49/28.6 headset top assembly is characterised by its reliability and durability. The reason for this is the corrosion-resistant stainless steel bearings and the double seal. In addition, the headset cup is made of high-quality aluminium. The compression ring is slotted to facilitate assembly.

Use:

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

Specifications:

Application:

Downhill, All Mountain, Enduro, Cross Country, Trail

Top Cup:

1.5"

Steerer Tube:

1 1/8" , 1 1/8" - 1.5" tapered

Design:

Zero Stack (ZS)

Technical Information:

Material:

aluminium (2014-T6)

Bearings:

angular contact ball bearings, stainless steel

Upper Insert Depth:

11.5 mm

Top Outer Diameter:

49.7 mm

Top Inner Diameter:

28.6 mm

Seals:

Cap and integrated rubber seal

Features:

• replaceable corrosion-resistant stainless steel bearings
• slotted compression ring race for easier assembly
• double seal

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 top and bottom parts 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 top and bottom parts must be combined.

Nomenclature:

EC:

Bearings contained within headset cups that are located outside of the frame (External Cup)

ZS:

Bearings contained within pressed-in headset 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 Numbers:

red:

HSC4R

blue:

HSC4B

orange:

HSC4C

purple:

HSC4PU

black:

HSC4

Contents:

• 1 x Hope upper headset cup incl. stainless steel bearings
• 1 x top caps
• 1 x compression ring
• 1 x O-ring
• 3 x spacers
• not incl. star nut
• not incl. Ahead cap