I have a real quick question and I'd love to know what the name of this part of the tire is called, because I could just use a reference book or website, but I thought it'd be straightfoward to ask here.

Why I I Took My Tire/Tube Off

I wanted to check my tubes on my tire for my road bike--tires are 700x32, max psi of 110, and thought I'd remove the tire as well.


Lines in Tire Hidden Under Rim

After installing, I noticed that the lines that are about 1/4 long (probably less) and less than 1/4 part, all along my tire, that are perpindicular to the outside of my tire on certain parts of the tire I took off are underneath the rim, somewhat hidden. I noticed where this is the case, it's on both sides of the tire.

The rear tire which I have not removed, does not look like this. Both pics attached in this thread are from the same tire, the rear tire.

What's the Cause Here?
I'm not sure what, if anything, I may have done incorrectly. Perhaps the tube is not installed quite right? I don't think those lines are simply worn out there, because it's on both sides and there should be at least a faint line underneath that is perpendicular and goes all around the tire which are close to the rim. You can see this in the picture with the section of the tire with lines more over the rim, "Lines ove rim"

Any experience to draw on and advice, I'd appreciate it.

Thanks!