OT? bicycle tires

1) I thought, starrting about 1978, that bicycle tires had to have a
reflective strip on each side, so the tires would show up in
headlights. I've seen tires for sale without that. ???

2) Bike tires could be twisted into three rings, easier to carry than
one big ring but still pretty bulky. Now Bell and maybe others sell
tires where the tire is rolled up, and from left to right, including
both beads, the tire is flat. These are sold in boxes where the front
of the box is cut out and one can see the surface well and touch it.

Now isn't the middle of the tire longer than either bead? Does it
stretch when it's rolled up? What about the side wall? Does the middle
get shorter?