Originally Posted by
Bill Kapaun
if it's TUBULAR, I'm ignorant of that category to comment.
If it's tubular, it's likely 700C, not 27" anyway (unless more exotic 650C or 650B). Look for ETRTO size markings on the tire and/or rim. nn-630 indicates 27"; nn-622 is 700C, nn-671 is 650C, nn-584 is 650B.
But yes, a 27" x 1-1/4" (32-630) tire will fit on a 27" (630mm bead seat) rim. Frame clearance may be an issue, but that's another matter.