Originally Posted by
Vintage Schwinn
GOOGLE: kenda k23
KENDA is the Only manufacturer that I know of for these SCHWINN Only 26 x 1 3/8 (37mm - 597mm) Tires.
^^^ This is what I found as well. I discovered this the hard way, initially assuming that the 26" wheels on my 1972 Collegiate Sport were the same size as the 26" wheels on my 90's mountain bikes. I bought the tires for the Schwinn only to find them too small, so I bought a backup set of 590 wheels for the tires, only to then buy a '93 Barracuda frame to build up to use as my suburban/gravel bike. I now find I use this bike more than any other in my fleet. All because I bought the wrong tire. Weird, huh?