Replacing a damaged seatpost on a Cervelo with a D-shaped seat tube means finding the exact proprietary profile, and the SP24 Carbon Seatpost is the current-generation replacement for the R5, Caledonia-5, and R5-CX frames. The D-shape matches the aerodynamic seat tube opening on these bikes, so a standard round post won't work regardless of diameter. Cervelo builds this post from UD carbon with engineered compliance that absorbs road vibration without sacrificing power transfer. If you've cracked a post in a crash, want a spare for travel builds, or need a different offset than what came stock, the SP24 drops in with the same fit and feel as the original equipment that shipped with your frame.

The SP24 ships complete with the rail clamp head assembly, which simplifies ordering compared to earlier Cervelo posts like the SP18 and SP19 that required separate head purchases. The two-bolt saddle clamp accommodates standard 7mm round rails and allows fore-aft adjustment along with angle changes for dialing in your position. Two offset options cover most fit scenarios: the zero-offset version keeps your saddle directly over the post center for riders who prefer a neutral or forward position, while the 15mm setback shifts your weight rearward for those who need more distance behind the bottom bracket. If you require 25mm of setback for a more traditional road position, Cervelo still offers the older SP18 post in that configuration.

Installation follows standard carbon seatpost procedures but requires attention to the D-shaped orientation, which only fits one way. The minimum insertion mark sits 65mm from the bottom of the post, giving you a visual reference for safe depth in the frame. Use carbon assembly paste on the post surface and torque to Cervelo's specifications to avoid slippage without crushing the carbon structure. The 370mm total length provides enough adjustment range for most frame sizes, though riders on very small frames with significant saddle height should verify clearance before ordering. The UD carbon finish matches the aesthetic of current Cervelo frames, maintaining a clean look at the seatpost junction. Unlike older Cervelo posts that used different head interfaces, the SP24's included clamp works out of the box with no additional parts needed.