feature: Made of aluminum alloy material, lightweight and , it can be used for a long time. Fully machined, non-slip, easy to install and remove Suitable for MTB bikes, mountain bikes, road bikes and more. It can be used as a set of large-diameter For seatposts and small-diameter For seatposts. CNC machining anodized Specification: Product Name: For Seat Tube Reducer Material: aluminum alloy Specification: 22.2 to 25.4 25.4 to 27.2 25.4 to 28.6 25.4 to 30.9 25.4 to 31.6 27.2 to 33.9 27.2 to 28.6 27.2 to 30.8 27.2 to 31.6 27.2 to 30.4 28.6 to 31.8 30.9 to 36 30.9 to 31.6 31.8 to 34.9 31.6 to 33.9 33.9 to 34.9 27.2 to 30.9 27.2 to 30 30.9 to 33.9 Packing size: 80*60*60mm Package Contents: Seat tube reducing sleeve *1 Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Compatibility - Bicycle For Seat Post Tube Seatpost Sleeve MTB Bike Reducer Adapter Good Performance Materials - These bike accessories are made of premium material, ensuring their durability and long-lasting performance. Optimal Performance - These accessories offer versatility and adaptability to different cycling needs and provide optimal performance and reliable functionality enhance the riding experience and ensure safety. Easy Installation - These accessories can be easily installed on your bike to get your bike running again. After-sale Serive - We provide high quality products, if there is any problem with our product, please contact us.