After sitting out the entire summer last year and then the winter, this is what I found between my ZX-14's front tire and the cardboard it had been resting on. It looked like tiny fiber tunnels such as you might expect to be woven by an insect. When I brushed it away, lo and behold, there were actual indentation trails in the tire that matched. That Pirelli woulda lasted one more rear tire but I changed both front and rear.

What the heck is this?

BTW, the tire is a slick. There's not supposed to be any tread.

Cardboard

Tire

* Last updated by: Rook on 7/7/2019 @ 3:08 PM *

The tire rubber is full of petro-chemicals and other chemical additives to create the rubber compound they want for the tire. must have reacted with the moisture and the cardboard

I was thinking that too. Cardboard is probably not a good thing to leave siting under a tire for any length of time.