> It seems to me that the French 531 Bartali > owned by Kurt Sperry, must be a plain gauge > tubing frame, if it has a 26.4 mm internal > diameter, although Sutherland's guide gives > this as an alternative to 26.6 for a double-butted > tube. 26.2 is given as the PG internal diameter. > Norris, In my experience, 26.4 is the most common seat post diameter for French bikes made from double-butted 531. Perhaps it's a matter of whether the frame is made from 513c, 531sl or whatever... The alternative, of course, is that the tubing decals are not accurate. (Oh, horrors!) Best regards, Fred Rednor -= Arlington, Virginia (USA)
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