It appears that your cart is currently empty
This¬†shim will let you easily fit the 27.2mm¬†Dual-Position Seatpost¬†or¬†ShockStop Seatpost¬†into your larger seat tube. Just drop the shim in your frame's seat tube and insert the seatpost. Once installed, the shim is essentially invisible.
‚Ä¢ Fits 28.6, 29.8, 30.0, 30.9, 31.6, and 31.8mm outer diameter
‚Ä¢ Fits 27.2mm inner diameter
‚Ä¢ 100mm (4-inch) length spreads out clamping load along seatpost and frame