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

Peace of mind for your carbon fibre steer tube.

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