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Bicycle seatpost collars (or clamps) come in various sizes and materials to match different seatpost and frame requirements.

The size is typically determined by the outer diameter of the bike frame’s seat tube, with common sizes ranging from about 28.6mm to 34.9mm.

As for materials, aluminum is widely used due to its light weight and good balance of strength and cost.

Carbon fiber is also an option for those seeking to minimize weight further, while steel clamps offer durability and strength at a lower cost.

Original price was: $79.74.Current price is: $52.71.