Apart from the set that came with the aeroplane when it was delivered brand new, most other tyres will be re-treads, albeit remanufactured to the same standard are the originals. The carcasses are re-used... again ... and again.

Cheers
BEX
Not many visitors...
I did spot (but not photograph) a couple of young fillies in period dress wandering around - I should have asked them to pose!