Some handle bars are 9-butted or even 11-butted because of all of the bends that require extra material. A lot of seat-tubes are single butted for example. A single butted tube would mean that it is only butted on one end and a constant throughout the rest of the tube. This helps to reduce weight in low stress points and bulk up where there needs to be more material. The tubing can be thinner in the middle because it takes less stress than the ends and typically you will find most breaks or cracks on frames and parts on the ends versus the middle. The thicker tubing helps increase the strength and allows for a better weld in high stress points. The reason for doing this is because the ends of the tubes are joined with other tubing and welded. Double butted means that the thickness of the tubing on the ends is thicker than in the center. For example on BMX frames, top and down tubes are frequently double butted. A butted tube means that the outside of the tube is a constant diameter and the wall thickness varies. Butted is a term that we see very frequently in BMX products.
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