Trek Electra brand Bontrager brand Trek Travel
United Kingdom / English
You’re looking at the United Kingdom / English Trek Bicycle website. Don’t worry. We’ve all taken a wrong turn before. View your country/region's Trek Bicycle website here.
  • Bontrager Headset Expander Plug and Top Cap
Bontrager Headset Expander Plug and Top Cap
Bontrager Headset Expander Plug and Top Cap

We'll take care of you. Period.

It's our mission to provide you with world-class hospitality every time you visit us online or in-store. We're always here to help you. It's the Trek way.

30 Day Unconditional Guarantee

Ride it and love it, or we'll take it back. If for any reason you're not 100% happy with your trekbikes.com purchase, you can send it back within 30 days for a refund or exchange - no questions asked.

Free shipping on all orders over £50

Simple, free delivery options for however you prefer to shop. Orders over £50 ship to your home for free, and all orders ship free to your local retailer for in-store pickup

Bontrager Headset Expander Plug and Top Cap

Model W547432
£17.49 RRP Sale price

Peace of mind for your carbon fibre steer tube.

Confirm delivery options

Address details

This site delivers to the UNITED KINGDOM (excluding Channel Islands, Isle of Man and Northern Ireland)

  • Note: We do not offer delivery to Post Office or APO addresses.
Direct-to-home delivery

Get your most accurate delivery costs. We offer free ground (for orders over ), 2-day and overnight delivery options.

Premium home delivery

Confirm that you’re in the selected retailer’s delivery area.

Find a retailer

Pricing details

Retailer price

Retailer pricing applies when you purchase goods online that the shop has in stock today. Order is subject to retailer acceptance.

RRP

Manufacturer’s Suggested Retail Price. This is the price you’ll pay ordering directly from Trek. Total price including delivery and taxes may be seen in the basket.

In-store collection
Direct-to-home delivery

Genuine replacement parts

A safe and secure alternative to the traditional star nut for carbon fibre steer tubes.

This expander plug can be easily installed in all Trek 1-1/8" carbon fibre steer tubes.

Product details

  1. Approved for use on all Trek carbon fibre 1-1/8" steer tubes
  2. Always install one spacer above the stem on carbon fibre steer tubes
  3. Do not use on aluminium steer tubes in place of a traditional star nut
  4. Torque inner expander bolt to 9-10Nm
  5. Torque top cap bolt to 4Nm