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Road Seatposts

Cervelo SP18 Carbon Seat Post No Head

Cervelo introduced their Squoval Max tubeset with the 2018 R5. The more aerodynamic tubes feature a D-shaped or flatback seattube, hence the development of a UD carbon flatback shape seatpost, the SP-18 Carbon Seatpost. Cervelo offers the two bolt fore-aft seatpost head as a separate item. This is a post only- no head.

Cervelo requires 70mm minimum insert for safety, which is clearly marked, as is the adjustment scale for accurate installation, fit, and re-insertion. The overall length is effectively 350mm, and the setback version is a 25mm model.


  • Replacement seatpost- post only no head- for 2018+ Cervelo R5
  • Model SP-18 Carbon seatpost has a D-shape, flatback design to match frame
  • UD carbon construction: effectively 350mm length with head affixed
  • Two-bolt seatpost head sold separately
  • Offered in two versions: 25mm setback, Zero offset
  • Color: UD carbon matte