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?