My Tire Mounting Problem
By Steve Litt
On my Gary Fisher Tarpon, I switched from an alloy rim to a steel rim
my rear wheel, and now I cannot center the tire, so my tire has an
low spot that thumps on every revolution and slows me down. The tire is
Continental Town and Country, 26" by something like 2.0", rated at
and I had no trouble with centering or low spots when using the alloy
equipped wheel. When I switched to a wheel with a steel rim, the
problems appeared. I've tried the following attempted solutions:
None of the preceding worked.
- Pumping it to 15 PSI and attempting to manually adjust the tire
the way around
- Applying soapy water all the way around both sides between tire
rim, and pumping it up to 70PSI
- Pumping it up to 90PSI and hoping the low spot would "pop out"
I suspect the root cause may be the configuration of the interior of
rims. The alloy rim had a "ledge" that prevented any part of the tire
sinking so low as to create a low spot directly opposite. It also was
up and down where the bead sits. On the other hand, the steel rim has
"ledge", so it doesn't automatically center. Adding to the problem,
a tiny lip on the interior of the steel rim near the rim's outer edge.
the diagrams below:
|The alloy rim has a ledge to prevent the bead
sinking too far into the rim. Such sinking would cause a tire low spot
degrees around the wheel.
|The steel rim has no such ledge. Further
the problem are the lips, which make it very difficult to "pull" the
outward. The steel rim is also about a half centimeter wider than the
which might possibly have something to do with it.
I really like my steel wheel. It has a bolt on axel to make theft less
It's strong and sturdy. It's cheap enough that I can replace it on a
basis (my original equipment alloy wheel lasted less than a year, and
are $59.00 instead of $25). Can somebody tell me how to properly seat
65 PSI Continental Town and Country tire into my new steel rim?
The answer was to purchase a Nimbus Armadillo tire. It holds up to 100
pounds, and centers like a dream if you pump it up to about 8 PSI and
then hand center.