Originally Posted by
noglider
There's a woman down the street offering me a ladies Collegiate Sport for $40. It needs work, which I can handle. I think I know someone to sell it to. But it has 26 x 1-3/8 tires, which I believe are NOT standard 26" tires, and it needs tires desperately. If I can find them, I'll buy the bike. If not, no thanks.
That particular size of tire is available through many distributors, and at very inexpensive prices.
The tougher task would be finding a quality upgrade tire. If all you're looking for is a replacement, they're common. It is known as a Schwinn S-6, or ISO/E.T.R.T.O. 597 mm.