The Cane Creek Seatpost Shim is a precision-made adapter sleeve that lets you install a smaller-diameter seatpost into a larger-diameter seat tube on your bike frame. These shims ensure a snug, vibration-free fit when the post and frame sizes don’t match, preventing seatpost movement and protecting the frame from damage.

Simple to install, this shim slips over the smaller seatpost and fills the gap inside the frame’s seat tube, allowing you to reuse a favourite seatpost or dropper post without needing to buy a new one to match the frame diameter.