WILIER SEATPOST EXPANDER CLAMP CENTO1AIR

The Wilier Cento1AIR Seatpost Expander Wedge and Clamp assembly is a highly specialized, multi-part hardware system co-developed with Ritchey. It is engineered exclusively to lock down the carbon monocoque aero seatpost inside the Cento1AIR's dedicated aerodynamic seat tube pocket. 

Unlike modern bikes that utilize a single hidden internal wedge, the Cento1AIR system relies on an integrated, combined dual-fastening structure. An internal expander wedge and a specialized external collar work simultaneously to secure the post from sliding or slipping downward.