Slight drift - sorry.
Many years ago, I decided to try to max out my XJ-S on a local die-straight (and virtually unused) single-carriageway stretch of the A5.
I got an indicated 140 out of her without any mishap or excitement, and decided to bottle out at that. Not that there would have been much left to go, you understand!
Anyway, the point of the story is - I drove straight home and when I got there something caught my eye on one of the rear tyres. Right at the shoulder, the tread had split from the carcass and sidewall, and you could clearly see the metal banding inside the structure of the tyre.
Needless to say that the next several moments were spend in very subdued and quiet contemplation... I have had a 'thing' about the state of tyres ever since.
My advice is carry a spare. Don't use that foam stuff - horrible!