Built this one up with Sun CR-18 EA3 rims and Col de la vie tires:
As others have pointed out, there are far more tire and rim choices these days in 650b/584mm, and most bikes that can be converted to 590mm wheels can likely be converted to 584. However, Grand Bois in Japan shows a couple of intriguing options:
https://cyclesgrandbois.com/SHOP/279...5974/list.html
I’ve ordered other things from them, particularly when the dollar buys lots of yen, and service was good, shipping prompt and fairly reasonably priced.