Schwinn Tire Sizes, AKA 1 3/4 does not = 1.75...and more


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Brutuskend

Finally riding a big boys bike
Apr 3, 2011
281
238
Eugene / Springfield Oregon
#21
so is a Schwinn 26 x 1.75 tire 571 ETRTO?
No, All schwinn tires except for one's that fit S-2 rims use factional tires instead of decimal maked tires.
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.
 
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