Bontrager Headset Expander Plug and Top Cap 1-1/8in Expander Black

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Headset Part Trek Top Cap Expander 1-1/8" 2018 Black Genuine replacement parts Peace of mind for your carbon fiber steer tube. A safe and secure alternative to the traditional star nut for carbon fiber steer tubes. This expander plug can be easily installed in all Trek 1-1/8" carbon fiber steer tubes. Key Features Approved for use on all Trek carbon fiber 1-1/8" steer tubes Always install one spacer above the stem on carbon fiber steer tubes Do not use on aluminum steer tubes in place of a traditional star nut Torque inner expander bolt to 9-10Nm Torque top cap bolt to 4Nm Specifications Color Black Size 1-1/8in Expander Gender unisex Intended User Age 12 years and over Model Year 2026 Weight 40.0g Show more