The blue run of Rams was the only one to offer 50 and 52 cm frames. They have 26" wheels (559 BSD) to preseve a better geometry. They cannot be upsized to 650B or 700 due to lack of space under brake bridge. They take up to 1 1/2" wide tires without fenders and 32mm tires with fenders. You could take a 54 cm and downsize its wheels to 650B or 559 with a change of brakes but I suspect the handling would suffer at 559.(I tried 559s on Ed Braley's 650B converted 53 cm, 700 orig design, Nashbar. It works but handles poorly) A 54 was made for 700 wheels.
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