Description: External cable wiring dropper remote control seatpost with 100mm stroke and independent hydraulic cylinder for smooth lifting and bicycle seatpost gasket adapter, use the adapter to easily change the size of the seat tube without replacing the seat tube High-quality aluminum alloy material, 3mm thick tube wall, frosted surface, light and strong, exquisite workmanship, good hand feeling; the adapter is fully CNC precision machined, the edges are smooth, and will not hurt your fingers Super-light design will not add more burden to your bicycle (31.6mm-625g) Please check the outer diameter of your bicycle frame seat tube before using this converter. Measure the inner diameter of the old fixture. Or measure the outer diameter of your seat tube (on your bicycle frame). Easy to install-remote lever, cable, housing components, including manual instructions for easy installation Suitable for most roads, mountain bikes, DH, FR, AM, XC bicycles, etc. Specification: Bicycle Remote Seatpost: Material: aluminium alloy Travel: 100mm Full Length: 375mm/ 14.76 inch Seat Cradle Adjust Angle: -5°+18° Diameter: 31.6mm/1.24inch Bike Seatpost Shim Adapter: Material: Aluminium Alloy Size: 27.2 to 31.6mm/1.07 to 1.24inch Length: 60mm/2.36 inch Package Includes: 1 Set Bicycle Remote Seatpost 1 Piece Bike Seatpost Shim Adapter Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!