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Note: Please choose the right size of the seat post Please do measure and confirm the exact post diameter that you need for your bike. Otherwise you may find it too small or too large for your bike frame seat post hole, then you'll have to spend more time to return it. Thank you for your support. Specification: Size: 25.4/27.2/28.6/30.4/30.8/31.6 × 350mm Diameter: 25.4/27.2/28.6/30.4/30.8/31.6mm Total length: 350mm (13.7inch), Tube Length: 325mm (12.8inch), Head Length: 25mm (0.9inch) Strength: 4.9 levels ultra high strength, maximum of 580lbs Setback: 20mm Adjust tube length: 0-350mm Use: mountain bike, track bike, fixed gear, road bike and so on Package Include: 1 * Bike Seat post How to choose the seat post size: 1.Check the diameter of the original seat post,choose the same size as the original diameter. 2.Measure the inside diameter of the frame tube.choose the same size as the inside diameter of the frame tube. 3.Measure your post with calipers for diameter, Measure your old seat post length, select your new seat post length. If you don't have measure tool, you could measure the outside diameter of the seat tube with a ruler, and calculate the diameter of your old post.