Bicycle Seat Post Size Chart

Bontrager offers road and mountain bike stems in a variety of lengths and rises along with seatposts with a unique clamp design that makes them highly adjustable.

Bicycle seat post size chart. This has resulted in a de facto standard of 27 2mm for high quality bicycles that have 1 1 8 o d. So if you don t know what size bike do i need here are the answers. Setting up comfortable riding position. How much the saddle needs to be raised from the end of the seat tube.

You can calculate or use the bike size charts below. For seatpost height in terms of bicycle fitting see. The length of the seatpost depends on frame geometry design and size i e. Since high quality seatposts are widely available in 27 2 most high end aluminum and carbon fiber road bicycles also use 27 2.

Separate post explains the maximum amount of seatpost extension from the frame minimal insertion length. Ride with more confidence and comfort with the perfect stem and seatpost for the way you ride. Bicycle seat post diameter on british or italian bike frames is typically around 1 1 8 inches in diameter or 28 6 mm. The bike size is measured from where the seat post starts and to the crank.

For example using the appropriate shim on a 27 2mm diameter seatpost will enable it to be used in a frame with a seat tube diameter designed for 31 6mm posts. Older french frames use 28 mm seat posts and older american style bicycle frames use a 1 inch seat post according to sheldon brown a bicycle mechanic and writer. Stems and seatposts help you achieve a proper bicycle fit. As a result a larger seatpost size is often a sign of a higher quality bicycle.