BMX seatposts: pivotal and race
A BMX seatpost is chosen according to the seat it carries, most often pivotal, and according to the frame: a diameter of 22.2, 25.4 or 27.2 mm and enough length to respect the minimum insertion mark. Short freestyle posts and shaped race posts are all on this page.
Pivotal, Stealth or railed: which post for which seat?
A pivotal post ends in a serrated head that takes the bolt running through the seat: the angle is adjusted in a single move. The Stealth variant takes the bolt from underneath and also accepts classic pivotal seats. A railed seat needs a railed seatpost, with a clamp that grips its rails.
BMX seatpost sizes: diameter and length
The diameter of the post is set by the frame: 25.4 and 27.2 mm are the most widespread, and 22.2 mm is found on some small bikes. It is engraved on the original post. The length depends on your seat height: short freestyle posts keep the seat low, and every post must stay inserted beyond its minimum insertion mark.
Aluminium, carbon and shaped profiles
Most posts are made of aluminium, sometimes machined to save weight. In racing, some models adopt a shaped profile, such as the Elevn Aero, or carbon, such as the Pride Racing Spline CF. A carbon post is tightened to the specified torque, with a suitable assembly paste.
Parts to pair with your seatpost
Choose your post together with the BMX seat it carries. For other bikes, see MTB seatposts and the full range of bike seatposts.
Which BMX seatpost brands to choose?
Insight offers its pivotal post in 22.2 and 27.2 mm, from mini bikes to pro bikes.
Elevn offers the Aero, a shaped pivotal post for racing, in 25.4 and 27.2 mm.
Federal offers the Stealth, a 25.4 mm aluminium pivotal post onto which the seat is fixed from underneath, and which is also compatible with classic pivotal seats.
Eclat, a components brand from Cologne, offers the Torch and Exile posts.
Kink BMX, a riders' brand from Rochester, in the United States, supplies a pivotal post and a Stealth post.
BMX seatposts on sale
For an end-of-line post, take a look at BMX clearance; newly listed models are in new arrivals. Black Friday is a good time to match your seat and post.
Frequently asked questions
What seatpost diameter for my BMX?
Read the diameter engraved on the original post, or check the frame's specifications. Failing that, measure the inside of the seat tube with a vernier calliper. An undersized post will end up twisting and marking the tube.
Does a pivotal post accept a railed seat?
No. A railed seat fits on a railed seatpost, a pivotal seat on a pivotal post. Choose the seat and the post together.
What seatpost length should you choose?
One that gives you your seat height while staying inserted beyond the insertion mark. In freestyle, a short post is enough; in racing, tall riders need a longer post.
How do you stop the seat from twisting?
Clean the post and the inside of the tube, check that the diameter is correct, then tighten the seat clamp to the specified torque. On a carbon post, assembly paste improves the hold without overtightening.
Is a carbon seatpost worthwhile on a BMX?
It is mainly used in racing, to save a few grams. In freestyle, aluminium stands up better to impacts and to landing on the seat.
