Roval Rapide/Terra Top Cap and Bolt

A shaped alloy cap and a single M6 bolt: that is the entire part, and it is the one that tends to disappear when an integrated cockpit comes off the bike for travel, or gets rounded out by someone chasing a creak. The Rapide/Terra Top Cap and Bolt from Roval is the factory service item for that hardware, and it is the piece that sets headset preload on the cockpit before anything else up front gets tightened.

Preload is the whole job here. The cap presses down on the stack below it as the bolt draws up, taking play out of the headset bearings before the steerer clamp bolts come to torque. Run that sequence backwards and you end up with either a knocking front end over rough pavement or bearings loaded hard enough to feel notchy through the bar. The cap profile is made to sit flush against the top of the Rapide cockpit rather than perch above it, which is the point on a cockpit built around clean airflow across the stem.

The bolt measures M6 x 1.0P with a 30mm length. Worth measuring that against what comes out of your own steerer before you order, particularly on a bike that has been through a few builds or had a non-stock expander fitted along the way. Specialized lists this assembly as the service part for the 2023 and 2024 Roval Rapide cockpits, and it is the item called out as sold separately alongside the Tarmac SL8 headset transition and spacer kit, which supplies covers and spacers but no cap.... Read More