FSA Orbit IS 138 Aluminium Headset 15.2mm 1-1/8" to 1-3/8"

The FSA Orbit IS 138 headset is an integrated aluminium headset for frames with a tapered head tube, 45/52 standard. It is for fitting or replacing the headset on a bike with a tapered fork.

• Weighs just 66 g, useful if you want to keep your bike light
• For tapered forks, compatible with the 1-1/8" - 1-3/8" range
• FSA IS-2-138 bearings with a 36°x45° angle for smooth steering
• Aluminium alloy body, strong and lightweight
• Before ordering, check that your frame has an integrated tapered head tube meeting the 45/52 standard

Technical specifications

• Standard: 45/52
• Material: aluminium alloy
• Weight: 66 g
• Top cap height: 15 mm
• Upper head tube: internal diameter 41.2 mm / external diameter 45 mm
• Lower head tube: internal diameter 49.1 mm / external diameter 52 mm
• Tapered fork: 1-1/8" - 1-3/8"
• Angle: 36°x45°
• Bearings: FSA IS-2-138, 36°x45°
• Package contents: one FSA star nut for forks with metal steerers