Originally Posted by Tony_G

It might be that, but most old dry rot I see takes the form of crazed checking, or spiderweb cracking.

I ran the tires at 85 PSI, which turns out to be underinflated. Why I thought 85 was ok is detailed in my long winded post #20 in this thread.

Anyway, looking at the tires, I see "1618" hot stamped in the sidewall. Everything else is moulded in. No way for me to know for sure, but taking into account European date style, 1618 may represent June 1, 2018.