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Tubing Selection for Recumbents: Practical

Some practical considerations for selecting tubing for a recumbent bicycle frame. By Mark Stonich In this article, I’ll be refering to 4130. This is the alloy number for commonly available Chrome-Molebdenum steel. The most likely source for this tubing is aircraft supply houses. Aircraft grade 4130 is seamless drawn and supplied Condition “N” (normalized). I …

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