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@walm
Until just now I thought that tubs weren't actually tube-like but more like clinchers which weren't clinched and had to be glued in place (i.e. U-shaped in cross-section not circular).
In fact, I never understood why tape would work at all, since most tape is hardly capable of forming an air-tight seal between rim and rubber. Particularly at 100+ PSI.
In my mind's eye I saw a bunch of highly retentive chaps supergluing rubber tyres to rims in a process probably taking days. I had been deeply impressed by people willing to fix a flat on their tubs at the roadside when obviously an operating theatre or dust-free semiconductor manufacturing type environment would be more conducive to creating that tricky air-tight seal.
I am clearly an utter moron.
As you were...