I remember riding in the late 70's early 80's on my "mtb" and getting flats all the time. If it wasn't a sand spur, tiny sliver of glass, or even a rose bush torn, the tube would sometimes fail from friction inside the tire. Though I also remember back then that carrying a extra bike tube was just crazy, all you needed was a patch kit and bike pump. Many tubes had multiple patches, and they all held up.

Now it seems crazy not carrying a tool kit, tube, and co2 inflator.