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How butted bicycle tubing is made

The invention of butted bicycle tubing was one of the great advances in the developement of the bicycle.

In 1897 the Reynolds Tube Company patented a method to butt steel bicycle tubes. That is, they found a way to make the steel tubes used in making bicycle frames thicker at the ends where more strength was needed at the joints and thinner in the center to make the tube lighter and the resulting bike more comfortable. Metal bicycle tubes for high-performance steel bikes are still butted using the technology developed by Reynolds in the nineteenth century.

Here's an explanation from the Bridgestone Bicycle Company explaining how butting is done:

Making butted tubing