FOMTOR Bicycle Seat Post 309 x 350mm Alumium Adjustable Seatpost for MTB Road Bike BMX

Specification: Diameter:27.2/28.6/31.6(mm) Length:350mm Weight:27.2 x 350mm(300g),28.6 x 350mm(315g),31.6 x 350mm(350g) Strength: 4.9 levels ultra high strength, maxium of 580lbs Adjust tube length: 0-320mm Use: MTB, BMX, mountain bike, track bike, fixed gear, road bike and so on How to choose the seatpost size: 1.Check the diameter of the original seatpost,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. Package Include: 1 x Bicycle Seat Post(Length:350mm)