B187 Bicycle Seatpost

To fit frame seatpost hole:25.4mm. Extra long:15.7"(40cm);Help to raise height of saddle,so that tall rider don't have to bent much forward. Material:Strong aluminum alloy,durable and light weight. Clamp is adjustable for the saddle tilt angle. Replacement seatpost for most bike,such as:mountain bike,road bike,universal bikes. SpecificationsMaterial:Aluminum alloy 7075Weight:about 300g(27.2mm)/320g(30.9mm)/340g(31.6mm)Color:blackLength:400mm/15.7''Tube thickness:2mmTube outter diameter:25.4mm,27.2mm,28.6mm,30.9mm,31.6mm  (five size for you to choose,please choose the right size before you place the order)Micro adjustable clamp:you can adjust the tilt angle of the saddle via the clamp to make the saddle horizontal. （Installation diagram） Attention:the bike saddle is not including.How to measure and confirm the diameter that you need ?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