Specialized Light Weight Alloy Top Cap & Star Nut - 1-1/8" Steer Tube

Specialized Factory Replacement 1-1/8" Star-Nut & Top Cap Assembly

This Specialized factory replacement star-nut and top cap assembly is designed for bicycles using a 1-1/8" threadless steerer tube. The kit includes a six-flanged star-nut, a lightweight concave alloy top cap, and a long M6 alloy bolt, providing secure headset preload and a clean, low-profile finish.

Ideal for headset installations, fork replacements, or worn hardware service.

Kit Contents

• Star-Nut:

  • Size: 1-1/8"

  • Type: Six-flanged steel star-nut

• Top Cap:

  • Material: Lightweight alloy

  • Shape: Concave design

• Top Cap Bolt:

  • Thread: M6 × 1.0P

  • Length: 35mm

  • Material: Alloy

  • Tool Interface: 4mm hex

Features

• Designed for standard 1-1/8" threadless steerers

• Six-flange star-nut provides strong, secure anchoring

• Lightweight alloy components reduce unnecessary weight

• Concave top cap offers a clean, modern cockpit appearance

• Genuine Specialized factory replacement part

Recommended Use

• Road, gravel, and mountain bikes with 1-1/8" alloy steerer tubes

• Headset service or fork installation

• Replacement for damaged or corroded star-nut assemblies

⚠️ Installation Note:
Star-nuts are intended for alloy steerer tubes only. Do not install in carbon steerers—use a compression plug instead.

A simple, reliable, OEM-correct solution for proper headset preload and long-term steering performance.