These tires fit Schwinn 26" "Middleweight / Cruiser" rims from the 50s, 60s and 70s. Note, this is interchangeable only with tires marked with a fraction, i.e. 1 3/4". This is not interchangeable with tires marked with a decimal, i.e. 1.75" Altough the numbers are mathematically equal, the rim and tire sizes designated by fractions vs. decimals are never the same. ISO: 54 x 571
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