Flush wedge clamps secure seatposts without the external collar that traditional frames use, but they create a gap at the seat tube junction where the post enters the frame. On the Caledonia-5, that gap sits right where road spray, grit, and moisture would otherwise work their way into the clamping mechanism. The Cervelo Seatpost Clamp Cover 314 seals that junction, keeping contaminants out of the wedge system while maintaining the clean visual profile that the integrated clamp design was meant to achieve.

The cover is shaped specifically for the Caledonia-5's seat tube opening and the D-shaped SP18 carbon seatpost that the frame uses. It's not a universal fit—the profile matches the asymmetric post shape and the contour where post meets frame. That precision fit means no gaps around the edges and no awkward overlap that would interrupt the frame lines or catch on your shorts.

Installation requires a specific sequence: the cover must slide onto the seatpost before you insert the post into the frame. You can't add it after the fact without removing the seatpost entirely. If you're doing a fresh build or replacing a lost cover, just slip it over the post, set your saddle height, and the cover drops into position over the junction. It stays in place through normal riding without fasteners or adhesive.... Read More