The Problem Solvers Seatpost Shim is what you need when your seatpost is a little too small-diameter to fit tightly into your frame. It's made of light, durable aluminum and has a lip on the top so it won't slide down inside the frame during installation.
|1.4mm shim, 27.2 seatpost to 28.6 frame||708752009882||ST0214||210000080590|
|4.4mm shim, 27.2 seatpost to 31.6 frame||708752012875||ST0244||210000032226|
|1.6mm shim, 25.4 seatpost to 27.0 frame||708752024373||ST0516||210000032526|