Everyone so far has viewed this from the perspective of stretching a too-small tube too much. But consider it from the opposite perspective for a moment. A tube that is too large is hard to install, tending to get caught under the bead of the tire - a recipe for an on-the-road blowout. I'd rather use a tube that is slightly too small than one slightly too large. Stretching a tube from 25 to 28mm (not much of a stretch) is IMHO better than trying to cram a 32mm tube into 28mm.
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