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700C/622 tubs.
But they're not 622, a 700mm/28" tubular rim is 632mm diameter. There is no "C" because that is a letter designating the difference between tyre overall nominal diameter and bead seat diameter for a clincher tyre.
While the sidewalls of a clincher rim mean the rim OD and brake alignment are similar for 700 tubular and 700C clincher, the tyre sits "higher" on the tubular rim so the rolling diameter of a 700×25 tubular is slightly larger than a 700×25C clincher
I mean, if it’s Glasgow then I’m the sheriff!
I want to be safe though.
Hadn’t thought about 28” tubs, had only really looked at 27” clinchers. I’ll have a look and see what’s available.
Edit: thought you meant that 28” tubs were a different thing to 700c tubs. Or, to be clear, 622 tubs.