Which is safer, heat or stretch? And by safer I mean least likely to ruin the tyre - they are only go on at 30psi for training / racing cross so blowing off the rim isn't going to be too horrible
I mean, if they don't stretch as is, there is no chance of them mounting without snapping the bead.
Yeah - like the old 'how to ruin a tub in one easy step' technique?
I've also considered heating them to 45-50 deg...