At 5:04 PM +1200 7/25/14, David Mann wrote:
On Jul 25, 2014, at 6:56 am, Steve Sharpe <[email protected]> wrote:
My Raleigh C40 (schrader valves) was flat after two years. I
pumped them up a few weeks ago but when I went to ride it the front
tire was flat. Took it apart and the tube was shredded. I don't
know when it exploded, because I didn't hear anything. That one
usually holds air better than the Super Course.
My guess is that the rubber perished. I've had that happen once
before. It'll look like lots of cracks in the rubber.
I originally put that tube in because the valve on the previous one
leaked. I just wanted to replace the valve, but around here you can
no longer buy replacement valves; you have to buy a new tube and
valve.
My wife is in the same mode as you. This year her tires go flat
every few days, but no one can find a leak in them. Usually they
need topping up every few months as well (Prestas). I suspect a
leaky valve.
Could be the valve, some tubes have removable cores. I had a tire
that used to go flat at about that rate. Tightened up the valve
core and the problem went away. That was a more expensive tube
(Continental brand) than what I normally use. My usual cheapies
don't have removable valve cores.
Take the tube out, put a little air in and dunk it in a bucket of
water. If there's a slow leak you'll see a stream of bubbles.
She's done that; and she's taken it to two different shops and
they've done it, too. Found nothing but still it goes flat. For all
the money she's spent trying to track down that leak she could have
bought several new tubes and been done with it.
--
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