It is my understanding that regular 531 was rebranded as 531C when the lighter gauge 531SL was marketed in the early eighties. Interestingly according to Le Cycle in the late sixties all the top French makes eg Peogeot, Lejeune and Motobecane were using "Reynolds 3/10" for their Pro bikes. This is claimed for Pingeon's 60cm 1967 Tour winning bike. So much for the importance of rigidity! By the way Bill Philbrook always referred to tubes by their gauge, ie 22 and 24. No doubt some old English system maybe the same as spokes? Regards language in the peloton-bunch-field-gruppo. I've never heard seat mast in the Uk, post, pillar or pin but not mast. "Sprints and tubs" was universal and rear gear was usual combined with front clanger, no doubt a play on the way those Gran Sport changers worked. The only Italian I can think of in common usage is Tifosi and Gregario although when one of my feeble break-away attempts on a clun run is reeled in I announce "gruppo compato". But Italian has provided the all time classic cycling phrase "Uno homo solo commando" Apparently used by the radio commentator as Coppi topped the Stelvio alone. Magic. (sorry if I've abused Italian) Ray Green Brighton England
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