Tires: pull them or cut them

[psimet]

Looking for a little guidance: need to start refinishing my wheels but they all have tires from the 60’s 70’s on them. They are pretty hard with no give.

Worth it to take somewhere with a tire machine to remove them or just cut them off? I’ve got 7.

I’ve only briefly tried to pull them with tire levers. They are all popped off the shoulder of the rim and I’m pushing the opposite side of the bead into the rim channel but still no give or flex under body weight.