Worth adding to this fine advice, in some circumstances an excessively
wide tube makes it very difficult to seat the tire without catching the
edge of the tube under the bead. If that's an issue, going to a
slightly narrower tube can make tire installation a lot easier.
On 03/09/2014 02:17 PM, Ron Mc wrote:
I'm with Michael - sounds like pinched tube. The best way to avoid
pinched tubes is to install the bead over the rim, starting just
beside the valve stem. A bit of air in the tube, pushing the tube
into the rim ahead of the tire bead, and gradually work your way
around the wheel back to the stem. As you approach the stem, you have
gradually let air out of the tube. When you get close to the stem,
finish seating the bead by pushing the stem as far into the tire as
you can while you seat the last piece of bead. Add just a bit of air
to the tube, and go all the way around the tire rocking the bead to
free any pinches.
On Sunday, March 9, 2014 1:07:39 PM UTC-5, Michael Hechmer wrote:
This certainly does sound like a pinched tube. What do the holes
look like? A pinch produces two small holes that look like a
snake bite. If this is the case, after mounting the tube go
around each side of the rim pushing the tire in and make sure you
can see the rim. Then run a lever around between the rim and
tube. Put about twenty pounds in and inspect the rim - tire
connection. If it's OK add another 20 lbs and repeat.
Since you have swapped wheels it don't sound like a rim defect.
Also, from your note it sounds like it is only the rear. Have
you considered swapping the tires? Also, I always mount the label
next to the stem so I can more easily find a relationship between
the tube and something embedded in the tire.
Keep us posted.
Michael
On Sunday, March 9, 2014 1:19:06 PM UTC-4, Nick Worthington wrote:
Querying the collective knowledge here. We're having a
recurring problem with the rear tire on my wife's Betty
blowing out at around 60 PSI and above. Schwalbe Little Big
Ben, which is rated for 50-85 PSI. Yesterday, it blew two
blocks from home, after being topped up with air, ithad been
ridden with no problem for several months since the last
blowout. Thought it might be rim tape, so we actually swapped
the whole wheel, since we had a spare. Still happens. Once,
it blew just after inflation, in our hands, when we were
replacing the tube from a prior blow out. I'm thinking it
must be the tire itself, but I don't see anything obvious -
Maybe a slightly rough patch near the bead, but it doesn't
seem to have any obvious pointy bits....
Thoughts?
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