<p><b>Specification:</b></p> <p>Diameter:25.4/27.2/28.6/30.9(mm) <br /> Length:350mm<br /> Weight:27.2 x 350mm(295g),28.6 x 350mm(315g),30.9 x 350mm(325g)<br /> Strength: 4.9 levels ultra high strength, maxium of 580lbs<br /> Adjust tube length: 0-320mm<br /> Use: MTB, BMX, mountain bike, track bike, fixed gear, road bike and so on</p> <p><b>How to choose the seatpost size:</b></p> <p>1.Check the diameter of the original seatpost,choose the same size as the original diameter.<br /> 2.Measure the inside diameter of the frame tube.choose the same size as the inside diameter of the frame tube.</p> <p><b>Package Include:</b></p> <p>1 x 27.2 Bicycle Seat Post(Length:350mm)</p>