Features: * Bicycle Bike Seat Post Shim Tube Sleeve Reducer Seatpost Converter Adapter * brand new and high quality *Made of high quality materials, and practical *Fit for 222/254/27.2/31.6/339 hole diameter seat tube *Made of aluminum alloy material, light and beautiful. Precision machining, which can solve the problem that the size of your frame and seat tube does not match Specifications: *Material: Aluminum Alloy *Color: As Pictures Show *Size: 60mm (34.9 height 40mm) *Optional model: 22.2 to 25.4, 25.4 to 27.2, 25.4 to 28.6, 27.2 to 28.6, 27.2 to 30.4, 27.2 to 30.8, 27.2 to 31.6, 27.2 to 33.9, 31.6 to 33.9, 33.9 to 34.9 *Weight: 24g (Approx) *Installation : 1. Open the tube clamp, put the converter into the hole of the frame seat tube, and push it to the end 2. Insert the seat tube into the converter, adjust the height, and lock the tube clamp Package Contents: 1*Seat Post Shim Tube 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. 【Seat Post Shim Tube】The bicycle seat post shim tube is designed for MTB bikes and serves as a converter adapter for seatpost reduction. It is made of for durable and practical materials. 【Multiple Size Options】The shim tube is available in various sizes including 2 to 25.4, 25.4 to 27.2, 25.4 to 28.6, 27.2 to 28.6, 27.2 to 30.4, 27.2 to 30.8, 27.2 to 31.6, 27.2 to 33.9, 31.6 to 33.9, and 33.9 to 34.9, compatibility with different seat tube diameters (222/254/27.2/31.6/. 【High-Quality Aluminum Alloy】Crafted from lightweight and beautiful aluminum alloy material, the shim tube offers precise machining to resolve the mismatch issue between the size of your frame and seat tube. 【Easy Installation】To install, simply open the tube clamp, insert the converter into the frame seat tube, push it to the end, insert the seat tube into the converter, adjust the height, and lock the tube clamp. 【Package Contents】Each package includes 1 seat post shim tube weighing approximately 24g, providing a reliable solution for seatpost conversion needs.