27.5 mountain bikes are mountain bikes which use a large volume tire that is approximately 27.5 inches in diameter, 56 mm wide (ISO 56-584 / 27.5 × 2.25) on an ISO 584 mm rim. 27.5 mountain bikes are also called tweeners, since it "fits between" the traditional 26-inch wheels and the newer 29ers.
27.5 mountain bikes are mountain bikes which use a large volume tire that is approximately 27.5 inches in diameter, 56 mm wide (ISO 56-584 / 27.5 × 2.25) on an ISO 584 mm rim. 27.5 mountain bikes are also called tweeners, since it "fits between" the traditional 26-inch wheels and the newer 29ers.
Source: Wikipedia "27.5 mountain bike" · CC BY-SA 4.0
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