I'm with spotter, if a 43mm tyre doesn't fit in the front at 584, 590 would be even tighter. 26" isn't a reason not to build it up imo.
590 (26 1 3/8) is closer to 584 35 or 38 init? The actual rim size has little bearing on overall tyre diameter. But y’all are probably right at it being 26”.
@Eeyorecore started
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I'm with spotter, if a 43mm tyre doesn't fit in the front at 584, 590 would be even tighter. 26" isn't a reason not to build it up imo.