Sono copertoni con dei fili metallici all'interno che li rende più resistenti.

Una spiegazione (https://www.hibike.it/schwalbe-durano-plus-28-copertone-perf...
"The bead wire tire is one of the variants, the foldable is the other. Where is the difference between wired-on and folded tyres on the road bike? As the name already says, there is a metal wire incorporated into the bulge (carcass) of the road bike's wired-on-tyre, which CANNOT be folded and basically, it has its round, firm shape. This is why the tyre can only poorly be transported on tours - the biggest "disadvantage" is quickly explained. Furthermore, they weigh a little bit more than the foldable ones due to the use of metal, but they outdo the foldable ones in terms of price. Here, the wired-on-tyre can score: It can be bought at lower prices! And it is said that it is easier to mount a wired-on-tyre than a folded tyre due to its pre-defined shape. Other than that there are no further differences. In addition, it is important to pay attention to the rolling resistance when choosing your tyre and also that the tyre is low-wear and as puncture-protected as possible. Whether you choose the wired-on or the folded variant, whichever you prefer is a matter of taste...."

ecco un glossario:
https://www.sportoutdoor24.it/abici-delle-due-ruote-glossari...

metterei
del tipo rigido (wired on)