UPANBIKE Bike Seatpost Shim Sleeve - Universal Bicycle Seat Post Tube Adapter for Mountain, Road & Electric Bikes - Perfect for Adjusting Seat Height & Enhancing Riding Comfort

Product Specifications Material:Aluminum alloy Total length:60mm Net weight:20g Color:black Ten Sizes for you to choose: 25.4mm to 27.2mm 25.4mm to 28.6mm 25.4mm to 31.6mm 27.2mm to 28.6mm 27.2mm to 30.0mm 27.2mm to 30.4mm 27.2mm to 30.8mm 27.2mm to 31.6mm 27.2mm to 33.9mm(Especially suitable for electric bicycles) 31.6mm to 33.9mm(Especially suitable for electric bicycles) Please confirm the exact seatpost shim diameter that you need for your bike before purchasing,thank you very much for your support. 27.2mm to 30.8mm size specification(Size Example) Inner diameter:27.2mmOuter diameter:30.8mmUse this seatpost shim sleeve(size 27.2mm to 30.8mm),you can use 27.2mm seatpost on your 30.8mm bike seatpost.Please confirm your bike frame seat post outer diameter before ordering(Measure the inside diameter of your old clamp,or measure the outside diameter of your seat tube). Installation Renderings Suitable for many kinds of bikes,such as mountain bike,road bike,folding bike and etc...