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@60sOldFart
Blimey, gear specs have changed a bit since the 60s. Used to say e.g. 81" (which you could get with 48x16 or 45x15 or 51x17 etc. Specifying by ring and sprocket size makes gears which are, in fact, the same appear different. Mind you, what do I know - there used to be nobbut fields around 'ere.