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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.
yoshy-
I thought 650bx47 was equivalent in outer diameter to 700cx30? I should clarify the tyres in the picture were 700c.
But ye looking at a few speedway bikes/frames it does look like 26" was more common.
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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”.
oheyitsd
Eeyorecore
Could be 26 1 3/8? It’s remarkably close to 650b, 590 vs 584. Was 26 1 3/8ths CSW a thing?