Position One Headset Cap and Star Nut 1-1/8"

Product Overview

The Position One Headset Cap and Star Nut is a compression lockout system designed for 1-1/8" steerer tubes. It provides bearing preload adjustment and steering stability through a top cap and integrated star nut assembly with BTR fastener.

Key Features

• Compression Star Nut Design - Wedge-style nut threads onto steerer tube and creates downward preload when top cap is tightened; eliminates bearing play without over-tightening
• BTR Fastener Included - Standard bolt-through-rotor compatible screw; allows preload adjustment without removing fork or brake components
• Simple Installation - Tool-free adjustment once installed; tighten top cap to dial in bearing preload until play is eliminated and steering is smooth
• Durable Construction - Aluminum cap and steel star nut withstand repeated preload adjustments over the bike's lifespan

Technical Specifications

• Steerer Tube Diameter - 1-1/8"
• System Type - Compression star nut with top cap
• Fastener - BTR (Bolt Through Rotor) screw (included)
• Material - Aluminum cap; steel star nut
• Installation - Thread star nut onto steerer tube; mount top cap and tighten fastener to desired preload

Compatibility and Ideal Use Cases

• Steerer Compatibility - Fits 1-1/8" threadless steerer tubes only; not compatible with 1.5" tapered or older threaded stems
• Headset Compatibility - Works with any 1-1/8" external or integrated headset; standard across modern MTB and trail bikes
• Use Case - Essential component for threadless headset setup; allows field adjustment of bearing preload without tools
• Maintenance - Periodically check and adjust preload if steering develops play due to normal bearing settling or wear
• Not Compatible With - Tapered (1-1/8"-to-1.5") steerer tubes or integrated headset systems that use press-fit caps