CYSKY Seatpost Adapter Shim, Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX, Fixie Gear. 27.2mm to 31.6mm

materials: Aluminum alloy Length: 60mm Size: Convert a 25.4 seat post to fit a 27.2 seat tube. Convert a 27.2 seat post to fit a 30.8 seat tube. Convert a 27.2 seat post to fit a 31.6 seat tube. Convert a 27.2 seat post to fit a 33.9 seat tube. Convert a 33.9 seat post to fit a 34.9 seat tube. Suit for MTB bike, mountain bike, road bike etc. Package Include: 1 Piece of Seat Post Adapter Note: Please check your bike frame seat tube outside diameter. Measure the inside diameter of your old clamp. Or measure the outside diameter of your seat tube (on your bike frame). Then make a right choice.