The Specialized STP MY18 Tarmac Seatpost Wedge with Bolt is a replacement internal clamp designed for 2018 and newer Tarmac frames. It secures the aero seatpost inside the frame’s top tube, providing reliable pinch force without external hardware. The wedge assembly includes an aluminum body and a high-strength steel bolt, and installs flush with the frame to maintain aerodynamic profiles.

• Application: internal seatpost clamp for 2018+ Specialized Tarmac frames

• Includes: alloy wedge body and steel pinch bolt

• Installation: push-fit wedge inside top tube and torque bolt to spec

• Torque specification: 55 in-lb (6.2 Nm) recommended

• Material: aluminum alloy wedge with steel hardware

• Compatibility: Specialized Tarmac MY18 and later models with aero seatpost design

• Function: prevents seatpost slippage while preserving frame aerodynamics