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spotter-
You were right. I had some old 26" wheels from a retro MTB I bought, took the cassette and spacers off so it would fit in the back and it definitely is for 26 inch. There's heaps of space in the front, back not so much but could probably get a 2.2/3 inch in.
@alialias well I was already slowly building a retro MTB fixed gear but chainline issues slowed it down. So maybe I will get hold of some wheels and put some together. Not sure what to do about braking, maybe just run small gear and go without.
Anyone got a 120mm fixed hub on 26" rims? lol
oheyitsd
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.