Thread: Tire size question
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Old 07-12-15 | 10:37 AM
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Pompiere
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From: NW Ohio

Bikes: 1984 Miyata 310, 1986 Schwinn Sierra, 1987 Ross Mt. Hood, 1988 Schwinn LeTour, 1988 Trek 400T, 1981 Fuji S12-1977 Univega Grand Rally, S LTD, 1973 Sears Free Spirit 531, 197? FW Evans

Most 26x1 3/8 tires are made for rims that have a 590mm bead seat diameter. 26x1.5 or any other decimal are made to the mountain bike standard 559mm bead seat diameter. You could use a 26x1.25 tire, if you are looking for a narrower tire.
Sheldon Brown's Bicycle Tire Crib Sheet
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