Diameter Size: 25.4 to 22.2mm,28.6/30.0/30.4/30.8/31.6/33.9mm to 27.2mm seatpost shim adapters.
Material: Bike reducing sleeve is made of high-quality aluminum alloy, lightweight, anti-rust,durable and can be used for a long time.
Installation:our seatpost shim can be installed in just a few seconds,easy to install and disassemble without tools.
Notes: Please measure the outer diameter of the seatpost (or check the size markings on the original tube) and the inner diameter of the bike frame,then choose the appropriate size.
Wide Application: Bike Seatpost tube adapter is compatible with most mountain bikes,road bikes,MTB, BMX,fixed gear bikes, etc.