Jack, you are the master fabricator, but perhaps there is some
misconception here about the (sacred) Reynolds 531. Phil Irving, the
immortal Vincent motorcycle designer, in his book "Motorcycle
Engineering" (1961) says, on p.96, "The chrome-molybdenum tubing termed
"531"(a symbol derived from its chemical composition) is the strongest
tubing available in the commercial range. It is quite suitable for
ordinary brazing and loses very little of its "as-drawn" strength
thereby." Table 7.1 on the same page shows the properties of five types
of Reynolds tubing, and in yield stress they range, after brazing, from
17 tons/sq. in. for "B", to 40 tons for "531". Ultimate stress figures
are 24 and 45, respectively.
I understand all the finest British racing motorcycle frames were made
of 531, and I seem to recall that it was also used on a lot of
high-class British bicycles, too. Bill
Of course this is pretty academic, since only a few on this list live in
countries where 531 is even available. Gary, do they sell it down in NZ
and Aus? Bill
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