FSA headset NO.55R/558 1.5 ACR RETROFIT w/TH-874-1 B1-OD 55.8

FSA headset NO.55R/558 1.5 ACR RETROFIT w/TH-874-1 B1-OD 55.8

FSA NO.55R/558 1.5 ACR RETROFIT headset w/TH-874-1 B1 – OD 55.8

The complete FSA NO.55R/558 ACR RETROFIT headset is designed for frames with a head tube diameter of 55.8 mm (1.5") and for ACR (Aerodynamic Cable Routing) internal cable routing systems. It enables elegant routing of brake hoses and housings straight through the stem and head tube, ensuring a clean and aerodynamic look of the bike.

Features and benefits:

• Compatible with the integrated FSA ACR / SMR system for internal cable routing

• RETROFIT type – designed for converting classic frames to cable routing through the head tube

• Bearings of the ACB (Angular Contact Bearing) type 45°×45° – smooth and precise steering

• Lower bearing TH-874-1 made of stainless steel for a long service life

• Durable aluminium housing and caps with a precise fit

• Elegant black anodised finish

Technical specifications:

• Model: NO.55R/558 ACR RETROFIT

• Outer diameter: 55.8 mm

• Type: integrated headset (IS 55/40)

• Bearing angle: 45° × 45°

• Lower bearing: TH-874-1

• Compatibility: FSA ACR / SMR systems, 1.5" frames

• Material: aluminium / steel bearings

• Weight: approx. 110 g

• Colour: black

Use and recommendations:

Ideal for modern road, gravel or MTB frames with cable routing through the head tube. Suitable for converting a classic frame to the internal ACR Retrofit system without having to replace the whole frame.