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Seatpost diameter sizes (standards)

Bicycle seatpost dimension (width, size) standards

Updated: 15/04/2021. To help prevent mistakes when purchasing or changing seatposts, this article explains what kinds of seatpost diameters are most commonly used and how they are measured. Only diameter (width) is dealt with here. The length of the seatpost depends on frame geometry (design) and size – i.e. how much the saddle needs to … Read more