I have some NOS 600 size rims and some very old 600X22 tires (Wolber). At 25+ years old the tires should probably end up in a dumpster. I had always planned on building up a bike with the rims. What size tire (and where can I get it) should I use? Anybody know anything about 600? Is it just a swap for 24"? Am I losing my mind?