FSA SX Pro ZS44/28.6 - ZS55/40 Headset

FSA SX Pro is a semi-integrated headset for 1 1/8" to 1.5" tapered steerer tubes and features forged aluminium bearing cups and an aluminium cap.

Use:

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

Specifications:

Application:

Enduro, All Mountain

Top Cup:

1 1/8"

Bottom Cup:

1.5"

Steerer Tube:

1 1/8" - 1.5" tapered

Design:

Zero Stack (ZS)

Technical Information:

Material:

aluminium

Bearings:

Angular contact ball bearings (36°/ 45° ACB)

Upper Insert Depth:

5.9 mm

Lower Insert Depth:

10.8 mm

Top Stack Height:

18.8 mm

Bottom Stack Height:

2.4 mm

Top Outer Diameter:

44 mm

Top Inner Diameter:

28.6 mm

Bottom Outer Diameter:

55 mm

Bottom Inner Diameter:

40 mm

Seals:

Blue Seal (top), Black Seal (bottom)

Top Cap:

Aluminium, 15 mm

Features:

• for head tube inner diameter 44 mm (top), 55 mm (bottom) = head tube outer diameter 50 mm (upper), 60 mm (lower)
• forged top headset cup CNC-machined bottom headset cup
• total stack height: 21.2 mm

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 Number:

ZS44/28.6 - ZS55/40:

130-0026

Contents:

• 1 x FSA SX Pro top headset cup incl. bearings
• 1 x FSA SX Pro top headset cup incl. bearings
• 1 x FSA headset cap
• 1 x compression ring
• 1 x FSA Ahead cap
• 1 x star nut with aluminium bolt
• 1 x crown race