Joined: Nov 2005
Posts: 4,016
Likes: 2,077
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
I have a bike that came from the factory with those 27x1 1/4 rims but had 27x1 1/8 tires. It's just a guide, not a restriction. What really matters is the actual inside measurement. You could run anything from 27x1 up to 27x1 3/8, also depending on the tire makers accuracy in sizing.