FSA ACR No.55R IS52/28.6 - IS52/40 Headset

The ACR No.55R IS52/28.6 - IS52/40 Headset by FSA for ACR and SMR cockpits

The ACR No.55R from FSA is a very special integrated headset that is mandatory for completely internal cable routing within an ACR cockpit and for semi-internal cable routing within an SMR cockpit. The headset with the S.H.I.S. code IS52/28.6 - IS52/40 can only be used with straight 1.5" head tubes and tapered forks. Be sure to combine it with the ACR headset expander, and please note that your frame must be suitable for internal cable routing.

Use:

Designed for 1.5" head tubes in combination with 1 1/8" - 1.5" tapered forks.

Specifications:

Application:

Road, Gravel, Cross Country

Design:

integrated (IS)

Top Outer Diameter:

52 mm

Top Inner Diameter:

28.6 mm

Bottom Outer Diameter:

52 mm

Bottom Inner Diameter:

40 mm

Head Tube:

1.5"

Steerer Tube:

1 1/8" - 1.5" tapered

Technical Information:

Bearings:

ACB chrome steel angular contact ball bearings, 36° x 45°

Top Stack Height:

10.4 mm

Bottom Stack Height:

0.5 mm

Seals:

Black Seal

Top Cap:

ACR Top Cover, Nylon

Compatibility:

Cockpit:

• FSA ACR
• FSA SMR
• FSA ICR

Frame:

• designed for internal cable routing
• 1.5" head tube

Features:

• especially for integrated cable routing in the ACR/SMR/ICR system
• preserves the full rotatability of the handlebars
• for head tube inner diameter 52 mm = head tube outer diameter 55.8 mm
• total height 10.9 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:

130-0020000010

Contents:

FSA ACR Headset No.55R IS52/28.6 - IS52/40, consisting of:

• 1 x bearing, top
• 1 x bearing, bottom
• 1 x ACR Top Cover headset cover
• 1 x ACR Compressor headset expander
• 1 x compression ring
• 1 x crown race