Qu: Do Tyres Stretch Over Time

[Cycling Badger]

I have a set of tyres with folding beads.
Easy enough to get on and off without leavers.
Puncture last week, replaced tube (snakebite)* and tried to reseat tyre.
The tyre seemed too big for the rim diameter and I had to mount it a couple of times to get it centred and bead engaged.
I've used these tyres multiple times before, and I swap tyres in and out depending on ride.
The tread has mileage left, and I didn't notice any obvious sidewall damage.
I'm off to give the bead a better inspection.

My question is has anyone experienced a tyre with folding bead stretch so that they become to loose relative to wheel diameter.



*Snakebite : Turns out that even if the on-line calculator states 55 PSI, you still need to check minimum pressure on sidewall of tyre! In this case it was 60 PSI. Updated my tyre pressure notes to inflate to 65 PSI to give a margin for error. (Beside being bloody obvious, I very much suspect this advise is given on the on-line app, but I just didn't read it.)

 

[Ming the Merciless]

Tyres always get easier to remove / fit after use. That tyre that was hard to fit the first time, but easier the next time. Likely only a matter of mm. But never loose enough the bead doesn’t sit right in the rim.

 

[rogerzilla]

Folding tyres seem to.stretch a lot more than wire-beaded tyres. About two weeks inflated on a rim tames most very tight tyres.

 

[Webbo2]

I had a GP 5000 on a 50mm carbon rim for over a year. I punctured and when I replaced the tube I had a right battle to get the tyre back on the rim even with a tyre glider. Ended with bleeding knuckles due to catching them on the spokes. So not all tyres stretch with age.
However I replaced my front tyre a Pirelli with like for like and it’s the first tyre in years I have managed to get with just my thumbs.
So if they get looser it probably blown off the rim by now.😂😂😂😂