Wore out three sets of tires already!
- Apr 3, 2011
- Eugene / Springfield Oregon
For instance S-5 and S-6 rims use a 26 X 1 3/8 tire with a 597 ISO Schwinn S-7 wheels use a 26 X 1 3/4 tire or a 26 X 2 X 1 3/4 tire both of which use a 571 ISO. BTW No matter what the Basic rim size with Schwinn rims (16-20-24-26) they make S-5 & 6 S-7 and S-2 so a 16 inch Schwinn rim marked S-7 would use a 16 X 1 3/4 tire and so on. Of all the Schwinn rims the only one's that use like size tires are S-5 & S-6 which use the same size tires, namely 1 3/8 tires.
Schwinn may have used some bikes after they stopped building them in Ill. that used 26 X 1.75 tires but those wheels wouldn't have been marked with a Schwinn tubular S - what ever mark.
BTW any rim that will take a 26 X 1.75 tire or 26 X 1.95 tire or ANY modern 26 inch tire can use a 26 X 2.125. You can safely go up and down on the width which is the later part of the tire size (1.75 - 1.95 etc..) as long as you have the clearance on your frame . 559 is the new standard for all 26 inch wheels. The only exception is any older narrow 26 inch tire like Raleigh or other european bikes.