If you have a 31.6mm seatpost and a 34.9mm seattube on your frame, you'll need a shim to make up that slack. Grab a problem solvers seatpost shim, and enjoy a nice firm clamp that'll keep your seatpost feeling firm and tight.
Slotted cylindrical shim converts 31.6mm seatposts to fit 34.9mm seat tubes
Deep length sits a few inches into seat tube, to provide sturdy clamp
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Problem Solvers Direct Mount Adapter The Problem Solvers
Direct Mount Adapter allows you to better manage your front derailleur setup on 100mm BB framesets running 2x drivetrains. With the adapter and the included shims, you can fit 34.9mm gear onto ...