Bontrager Expander Plug and Top Cap Headset ew-jc130-sm_di2_y-splitter_connector_wire Bar End Mount sold separately

Bar End Mount sold separately for road bar integration

whether you're sprinting out of a corner or clipping in on a technical climb

- Professional installation recommended if unsure

Please note: this kit is not compatible with 2008 or 2009 Madone seat caps

Hardware sold separately

Bontrager Expander Plug and Top Cap Headset ew-jc130-sm_di2_y-splitter_connector_wire Bar End Mount sold separatelyProtect your carbon steer tube the right way. The Bontrager Headset Expander Plug and Top Cap is the correct and recommended alternative to a traditional star nut for Trek carbon fibre steer tubes offering a secure, damage free installation that won't compromise the structural integrity of your fork. Unlike a star nut, which is hammered into place and can cause irreversible damage to a carbon steer tube, this expander plug uses a clamping mechanism