Cervelo SP23 Long Carbon Seatpost w/Head

The Cervelo SP23 Long Carbon Seatpost w/Head is the extended-length version of Cervelo's aero seatpost for its P5 and P-Series triathlon and time trial bikes, built in UD carbon with an aerodynamic profile shaped to match the frame's seat tube rather than a round, universal post. At 400mm, the long version gives taller riders or those running a slammed saddle position the extra insertion depth the standard-length SP23 doesn't have, while keeping the same adjustable offset and aero shaping.

It ships as a complete unit with the seat clamp head included, so it's ready to bolt a saddle straight to the post rather than sourcing a separate clamp. Being frame-specific, it only fits the seat tube shape it's designed for — Cervelo's P5 (2019 and newer) and P-Series (2020 and newer) — so it's worth confirming your frame's model year before ordering. For P5 or P-Series owners who need more post length than the standard SP23 provides, or who are replacing a damaged or worn post, this is the direct factory match that keeps the bike's aero profile intact.