Originally Posted by
CliffordK
Hmmm.... Most interesting.
So you have discovered the tire blister!!!
When you had it mounted, was it soft or hard?
Same as it is now - feels like an air bubble.
Any chance you've had that blister since new, and just never noticed it?
If the cords are intact, then it is probably OK to ride, at least on the rear tire.
I'm with @
ThermionicScott . I might pop it, even just for curiosity. Possibly a hollow hypodermic needle from the inside. Sniff the gas or fluid that comes out?
The tag is curious. Perhaps there is an element of the tire expelling gasses over time (or during construction), and that process is impeded by the tag.
Alien Impregnation?
Definitely hasn't been there since new, not sure how long it's been there but I believe it's relatively recent.