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The tire beads should be of about the same size/volume in both 25 and 28 (and most all other tube type) tires. So the fit issues due to the narrow rim, tire beads and valve should be pretty much the same. The tire mounting issues due to the tire's bead seat diameter being slightly different (as in a mm or so) is more about that tire's manufacturing (and the rim cross sectional design). Two different aspects of tire mounting. Which was the issue for you? Also where around the rim/tire were you ending up to fit the last bit of the tire's bead over the rim's edge? Andy
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AndrewRStewart