Join Date: May 2003
Location: Mountain Brook. AL
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The smaller diameter tube would easily expand to fill the tire, but the greater expansion means that any small defect in the rubber would be rapidly magnified
by the expansion and thus a tube that is designed for a 1" tire inflated enough
for a 1.5" tire would be more likely to fail. If it does fail, it will fail fairly early. The
problem is micro cuts on the surface of the rubber propagating to the ripping point.
Depends on whether you get a "good" or "bad" tube. Note that patches on a
tube expand very little and patching an undersized tube and inflating results in
a definite constriction and hourglassing of the tube.
On the other hand, if the tube is under sized for the wheel diameter, say 650c into a 700c wheel, it will be almost impossible to mount, it won't stay up in the tire, even with inflating the tube lightly. Steve
Last edited by sch; 07-27-04 at 01:07 PM.