Problem Solvers 4.4 mm Shim, 27.2mm to 31.6mm

The Problem Solvers 4.4 mm Shim, 27.2mm to 31.6mm lets you run a 27.2mm seatpost in a frame with a 31.6mm seat tube — a straightforward fix for a common compatibility gap. If you have a frame you want to use with a narrower post, or a seatpost you want to carry across builds, this shim handles the mismatch cleanly without requiring a new component on either end. Machined to close the 4.4mm gap between these two common seatpost standards, it seats securely and keeps the post properly supported under load. A tidy solution from a brand that specialises in exactly this kind of practical hardware.