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Got ya, I couldn't work out whether the 1 1/2 or 1 3/8 bit refered to tyre width, or the particular ERD. Seems to be both in most cases. Ordered some Delta Cruisers which are definitely the same 37-590 as the ones they are replacing.
edit: thought he'd somehow managed to fit a 650B tyre on to a 650A rim
Who knows? It could be 37-559 :-) Col de la Vie comes in 650A (590) and 650B (584) versions including a 650A which is a bit wider than the usual 26×1⅜ and is marked 26×1½