Having ordered a new back tire and waiting for it to come in , I needed to take a last round trip on the bike ,some 80 miles .  About 5 miles into the return trip (35 miles from home) I hit a sharp object in the road and it punctured the center of the tire and tube. (a 140/90/15-712 shinko). As luck would have it the beads stayed on the rim , the center of the tire being thin folded in forming a uu shape ,but the side walls were stiff enough to support the bike and keep the rim 2" of the pavement ,and allowed me to ride the bike home on the shoulder at 30-35 mph, stopping every 10 miles to allow the tire time to cool (no help was around -country roads- it was ride or push  )without damaging the rim (lucky!)  I have since mounted a new tire and tube with a 90 degree stem, another shinko !

Yes luckily I was going straight up a hill when it popped , I just let of the gas and coasted to the side of the road. I was just amazed that I could ride it home and not kill myself or damage the bike.

Wow!,.. 35 miles on a flat!...
Was that a Shinko 712?...

Whatever it was,.. it's my next tire...

A Shinko 712 is on the front of both of my bikes.         jest lucky, me