How to Choose the Size that you need

1. Check the diameter of the original seatpost, choose the same diameter of the original seatpost. For example, if there's a mark " Φ27.2"on your old seat post, then you can buy a new 27.2 mm seat post.
2. If you have a vernier caliper, measure the diameter of the original seatpost, then buy a similar size new seat post. For example, if the measurement is about 27.1 mm, then select a 27.2 mm seat post will do.
3. Measure the inner diameter of the middle tube of the frame, then buy a 1 mm thickness less new seat post.

Installation Tips:

1. Seatpost used for for most old style bike, and the bike saddle with clamp.
2. By raising the saddle height, a forward leaning riding position is born, even if the air resistance (drag) is reduced.
3. This item is sale as a single bike seat post, the saddle clamp is not included, you can buy a clamp separately or remove one from your old saddle.