the 590mm rim is the very common 26 x 1-3/8" size used on British (aka Raleigh) "3-speed" bikes for half a century (or more). When shopping on line search 37-590 tire, or if you go to a bike shop say you need a tire for a 26x1-3/8 3-speed.--- not a mtn bike.
Unfortunately, this is becomming a less popular tire so the selection at bike shops will be limited.
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