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Will a 27 x 1 wheel fit on a bike which had a 27 x 1-1/4? A back wheel with same size of cassette.
According to www.sheldonbrown.com the rim is the same size. 27x"1 and anything - except 1 1/2 is an Iso630 wheel so the same size.
The frame dropout spacing will need to match the hub axle width (O.L.D). Another useful Sheldon Brown web page here
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