Refers to ISO 559mm bead seat diameter rims and tires, the modern standard for mountain bikes, many hybrids, and small touring bikes. Tire sizes range from 26 x 1.0 to 26 x 3.6 and are printed in decimal format. A number of older American, British, and French tires are also listed as 26 x 1 1/4 to 26 x 1 3/4 in fractional notation; these refer to tires and rims of different ISO sizes.

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