I had yet another flat today even with Slime which has helped a bit. No, I am not considering foam filled. I see tires that weigh 12 pounds and others that weigh 14 pounds in that size. Some say 4 ply. Web surfing does not seem to provide much about tire specs. It would be great if there were aircraft tires in that size but I do not see any. Any opinions if there are any "good" tires out there?