Just get some run flat tires. I do not jest. There are such things. Last week the 20" front tire on our tandem went flat and I had left the pump at home. The wife waited near the MUP and I rode 5 miles back to the truck on a totally flat tire. Only had to replace the tube. Did that once before as a teen. Went 10 miles on a flat. Fat, heavy tires both times. Would not try it on a skinny rim/tire combo.