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jontea-
It depend on the tyres really, high end race tyres stretch noticeably, touring tyres less so.
Gravel King sit inbetween.
Or you're just doing it wrong.
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Over any time period.
Often it's soft sidewalled race tyres that'll have the tightest fitting beads, but touring tyres can have the stiffer, less-stretchy beads (I guess because they're built for durability, mileage and not down to a weight).
edscoble
miro_o
Beads do stretch