GANOPPER Seatpost Shim 27.2 to 30.9 mm Cycling Mountain Bike Seat Post Shims Alloy Bicycle Seatpost Adapter for MTB BMX,Road Bike

Tips Because of hollow design?In the process of transportation?it may be out of shape.If you found any deformation,please kindly exchange one Shim Product Feature: Made of full CNC precision machining aluminum alloy, anti-slip, light weight and durable. Easy to install and remove, convenient for you to use. With this seat post tube adapter, you can change the bicycle seat tube to the size you want. Suitable for MTB bike, mountain bike, road bike, etc. Please check the outer diameter of your bicycle seat tube. Check original seatpost Laser Mark on the tube.Measure the inner diameter of the old clamp. Or measure the outside diameter of the seat tube. Then make the right choice. Specification Condition: 100% Brand New Material: Aluminum Alloy Color: black Length:100mm/3.93 inch Inner diameter: 27.2mm/1.07 inch Outer diameter: 30.9mm/1.22 inch Convert any 27.2mm seatpost to a 30.9mm seatpost Package list: 1 * 30.9 to 27.2 Bicycle Seatpost Shim