Internal wedge clamping keeps seatposts secure without the bulk of an external collar, and the Cervelo Seatpost Wedge provides the factory replacement for S-Series and S5 frames that use this system. The wedge slides into the seat tube and expands against the seatpost when you tighten the bolt, creating grip through compression rather than squeezing from outside. If your original wedge gets damaged, stripped, or lost during a seatpost swap, this part restores proper clamping function.

Forged aluminum construction gives the wedge the strength to handle repeated tightening cycles without deforming. The forging process produces a denser grain structure than cast alternatives, which matters when you're applying torque to secure a carbon seatpost inside a carbon frame. Sharp edges get eliminated during manufacturing, reducing the risk of scratching your frame's interior during installation or adjustment.

Compatibility spans multiple generations of the S-Series platform. The wedge fits the S5 from 2011 through 2018, the S3 and S2 from 2014 through 2018, and the S3 Disc from 2016 through 2018. If you're running a newer S5 Disc model (2019 and later), you'll need the updated SPC-0E0S5 clamp assembly instead, as the internal geometry changed with that frame revision.... Read More