Originally Posted by
TenGrainBread
Please look at the tire and find the ISO diameter. "26 x 1 3/8" was used on English style 3 speeds for a few decades (590mm), and on Schwinns in a slightly different size (597mm). Both are different from a 26in MTB wheel (559mm).
The Schwinn tires are technically 26 X 1-1/4” to fit English EA-1 rims and Schwinn S-6 rims with a 597mm BSD. True 26 X 1-3/8” tires fit English EA-3 rims, aka 650A with a 590mm BSD. The most important difference is that the Schwinn compatible rims are open U with no hook, so maximum tire pressure is very low, typically 60 psi maximum. MTB rims and tires are good for much higher pressures.
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Last edited by TejanoTrackie; 10-23-17 at 08:18 PM.
Reason: correction, S-6 not S-1