Presta Valve ripped out
Darin T. Zimmerman
Has anyone had any problems with getting their presta valves ripped
out of the tube?
I'll put a new tube on and a week later half the valve will be pulled
from the base (I know it's not sharp edge that's causing it).
Jobst Brandt
> Has anyone had any problems with getting their Presta valves ripped
> out of the tube?
This seems to be a major flaw these days and I haven't see any
evidence for its occurrence. I see no cold joint nor any other reason
for this. One cause could be heat of pumping but even that doesn't
hold up because I seldom pump with a frame pump, the only pump where
air is delivered hot to the stem. The fractures in the rubber are not
even consistent. Sometimes the stem comes out with only a little
rubber on it and other times it takes a large chunk with it. It isn't
even tied to any brand.
It is a bit disconcerting because it could occur in a high speed left
hand curve with oncoming traffic. My last one went PSSSSS just after
I got off the bike.
Jobst Brandt <jbr...@hpl.hp.com>
Jeffrey Walters
problems (yet) with Specialized Turbo (all I use anymore).
Joshua_Putnam
>Darin Zimmerman writes:
>> Has anyone had any problems with getting their Presta valves ripped
>> out of the tube?
>This seems to be a major flaw these days and I haven't see any
>evidence for its occurrence. I see no cold joint nor any other reason
>for this.
>Sometimes the stem comes out with only a little
>rubber on it and other times it takes a large chunk with it. It isn't
>even tied to any brand.
I had a run of valve failures with IRC, Kenda, and Nashbar-brand
tubes last year, but after switching to Michelin tubes I have not
had this problem again. I know the problem isn't from pumping,
because I've had it happen to tubes that have never been inflated
with a frame or floor pump, just a compressor. I've also had it
happen on different models of rims, so I know that wasn't the
cause, either. I don't know what caused it with other tubes, and
it's entirely possible with the small sample size that my
flatless Michelins are a fluke.
I nearly crashed from one of the failures, a front valve popping
loose while I was descending in the rain on the way to work.
Luckily I got stopped before the tire came off the rim.
--
Jo...@WOLFE.net is Joshua Putnam / P.O. Box 13220 / Burton, WA 98013
"My other bike is a car."
Bike parts for sale: finger Joshua...@gonzo.wolfe.net for list.
Peter Gordon
>Has anyone had any problems with getting their presta valves ripped
>out of the tube?
>I'll put a new tube on and a week later half the valve will be pulled
>from the base (I know it's not sharp edge that's causing it).
It's happend to me three times recently. All the tubes were
Indonesian made IRC's. When buying an IRC tube last week, I
found that they had increaded in price by 50% and are now
Japanese made. The bonding around the valve looks much stronger.
Cheers
Peter Gordon
gor...@dpi.qld.gov.au
Stephen Hynes
>
>
>Has anyone had any problems with getting their presta valves ripped
>out of the tube?
Yes, I have lost them too. I switched back to Schrader type, and have never
had a problem. You can, too. Simply drill out your rim to allow for the larger
valve stem.
You will also have the happy opportunity to fill your tires at gas stations.
Steve Hynes
John Keith
: Has anyone had any problems with getting their presta valves ripped
: out of the tube?
: I'll put a new tube on and a week later half the valve will be pulled
: from the base (I know it's not sharp edge that's causing it).
I've lost three tubes in about 2800 miles of riding. It has been very
disapppointing, especially the last one which happened about three miles from
home and I had not yet replaced my spare tube!
JK
--
John Keith ke...@fc.hp.com
Information Services
>You will also have the happy opportunity to fill your tires at gas stations.
>
You can have that "happy opportunity" (?) with presta valves as well. I
acquired a little thingamajig from my local bike shop that's made of
brass and screws onto the end of the presta valve stem (and is only
slightly larger than the valve-cap) which makes it compatible with
schrader-type pump fittings. I carry it in my bike-bag in case I flat
and my frame pump croaks (which has happened), so that I can still fill
up at gas stations and avoid having to walk home. It works extremely well,
and cost me less than a buck.
Emergencies aside, however, I much prefer pumping the tires with my Silca
rather than competing with cars and neighborhood kids for the gas
station pump.
RES
--
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