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Seamless
From WikiPedalia
Metal tubing used in bicycle frames can be manufactured in two different ways:
- Seamless tubing begins as a solid round bar, which is heated to a workable temperature, then pierced by a mandrel. It goes through a series of rolling operations to bring the diameter and wall thickness to the desired sizes.
- Seamed tubing begins as a strip of flat sheet metal, which is curled into a tubular shape, then the edges are welded together. After this, the seamed tubing may also go through various rolling steps. Seamed tubing is cheaper, but weaker than seamless tubing. Generally, all better-quality bicycle frames are made from seamless tubing.
