Is there still much 531 around?
The last time I looked at the
Woodrup site, specific frame designs could be ordered in 531 with an informative proviso which went something like
... depending on supply. The last complete set of publicly auctioned Reynolds 531 bicycle tubing sold for an astronomical sum.
This has lead me to believe that constructors of classic mode frames are challenged for the true stuff that began mass production in the early 1930's. It has been formed into a galactic number of British airframes, race car chassis and bicycle frames. Could it ever be that the rising interest in classic bicycle frames could influence Reynolds to produce new production? Reynolds may tell you that they have already done this, but with an improved metallurgy. I am not one to argue that finer point. But would it not be a public relations coup if they were to do so — exactly!?
My own personal concerns as regards custom-built, classic style frames as reproductions is that the tubing be of the same outside diameter of most classic tubing, while at the same time it deforms/flexes somewhat in the same way we expect it to. In that set of perimeters, I believe that we are getting into an area where wheel-sets and tire selections are overriding — all the while assuming that classical geometry and proportions arebeing applied.
Perhaps the most important focus should be on the fork — its rake and whether or not the tubing formula behaves similarly to tubing of decades ago. Pretty esoteric stuff ... is it not?
IMHO, much of currently produced steel tubing produced for road machines can do this to a degree where we cannot detect a difference, but depending on application.* Still, I am not totally convinced. But having said that, I am thinking that the lugs and geometry play a more important part, even as modern metallurgy may prevail.
If my late Papa were to be ghosted back in order to ride a replica of his once beloved Bates in some modern, quality tubing (using the same intricate lugs) would he 'dis' the difference? An unanswerable question no matter which way you put it. It is a subject for debate and speculation — all adding up to friendly entertainment — I would hope.
My advise to the OP is to consider what loads will be applied to the frame and what geometry is best suited for your needs.
* Pure racer, sports-touring, touring, loaded touring ... each classic rendition has their respective ideal, specified tubing characteristic. The information is available — very likely on these forums.
