A seatpost shim lets you easily fit the 27.2 mm diameter dual-position seatpost into your larger seat tube. Just drop the shim in your frame's seat tube and insert the dual-position seatpost. Once installed, the shim is essentially invisible.
- Fits 28.6, 29.8, 30.0, 30.9, 31.6, and 31.8mm outer diameter.
- Fits 27.2mm inner diameter.
- 100mm (4-inch) length spreads out clamping load along seatpost and frame.
Seat Tube Shims