I've got a bike that hadn't been used in a while until a couple weeks ago, it was in a place where it gets direct sunlight (I'm trying to fix that) and as a result some things like the seat have spoiled.
Anyway, I inflated it just fine and have used it several times since then. About a week ago, another bike's tyre exploded (my guess is sun + overinflation); I spent a while trying to inflate that one to see if I could spot the rip, unsuccesfully and then just lt it be.
Since then, I've been unable to inflate the first bike's tyres due to major resistance (I guess the valve on the pump is not working properly)
Today, I was trying to inflate it before going out when I noticed there are bits peeling or being shaved off the side of the valve and I'm wondering whether this could be dangerous?