Yes, tubulars WILL turn inside out, because the tread constrains the carcass where it is attached, and the basetape will therefore elongate, but has anyone got an example of damaging the base tape? The stuff is a pretty loosely woven linen twill, in cotton tires. It has give.

I've pumped them up exactly this way many times to test for airtightness with no problems that my dumb eyes can see. I'd like to hear about an example, so I can learn something.

Road Fan