I found this write up on the Dahon website. The company specializes in manufacturing folding bicycles. In order to compensate for the sacrificed stiffness of the design the company developed a new shaped frame tubing which they have tested to be stronger and stiffer than traditional oval shaped tubing. Because of the importance of percision and control, as well as the need to withstand excessive abuse, this could be a useful addition to the extreme wheelchair frame.
Follow the link here
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