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@peter_v
Lowest you can go on NR cranksets is 42 due to the 144 bcd... My friend Frans is planning to use either his steel Reus or this Speedwell ti from the 1970s, as you can see with a TA crankset with a 50 and a 34 ('granny') ring. On the back he has a 13-26 if I'm not mistaken, also with a short cage Campagnolo NR derailleur. This works fine as long as you get the chain length right.