26x1-1/2 was the more commonly ussd designation for the wheel size used by Schwinn and Raleigh on their 80s MTBs. It's the same as 650b. As was mentioned earlier, decimal sizes are never the same as fractional sizes. The best bet is to always check bead seat diameter. 584 for 650B, 590 for 26x1-3/8, 559 for 26xdecimal, plus 571 and 597 and some other oddballs that may cause 26 or 650 confusion.
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