Popping valve stems.

kenwstr
Posts: 503
Joined: Tue Apr 23, 2013 8:21 pm

Popping valve stems.

Postby kenwstr » Sat Feb 10, 2018 11:19 pm

Hi,

So I have been repairing thorn punctures every week this season but have had 4 valves separate from the tube in as many months. The tubes are maybe 2 years old but thorn punctures have been exceptionally frequent this season. I run 100 psi in rear and 80 psi in front. The last one, I had just repaired the tube and inflated the tyre and was putting some things away so wheel was not on the bike yet and I hear it soft pop and whoosh goes the air. So off comes the tyre again and I check, it's popped the valve stem. Just a little hole right at the base of the valve stem which has clearly separated from the butyl. Now I swear, there are no sharp edges around the rim hole and the rim tape is correctly positioned, not blocking the hole. The butyl appears to be in good condition having always used talc. The pressure is checked regularly especially as they have had many pricks this season. Could it simply be age or is it more likely something I'm doing. They are all the same brand of light race tube but I don't want to identify the brand in case there are unfair assumptions made. However, is this a known issue with a particular brand.

Ken

User avatar
foo on patrol
Posts: 6450
Joined: Sat Dec 19, 2009 11:12 am
Location: Sanstone Point QLD

Re: Popping valve stems.

Postby foo on patrol » Sun Feb 11, 2018 6:57 am

I've had the area at the base of the valve start leaking on a number of them over the past few years and it had nothing to do with the rims. Poor quality in the rubber sealing of the tube. :idea: :wink:

Foo
I don't suffer fools easily and so long as you have done your best,you should have no regrets.
Goal 6000km
Image

User avatar
Tim
Posts: 1966
Joined: Wed Jul 07, 2010 5:02 pm
Location: Gippsland Lakes

Re: Popping valve stems.

Postby Tim » Sun Feb 11, 2018 7:41 am

I had a run of tube failures a year or two back.
Mostly cheap tubes supplied "free" with tyre purchases but also Continentals. Similar problem to OP but also unable to properly adhere a patch.
Since been buying dearer Schwalbe tubes. No problems.
I thought I might have been a bit rough attaching and removing the pump head but the problem ceased with better tubes.

User avatar
Ross
Posts: 5390
Joined: Sat Nov 07, 2009 8:53 pm

Re: Popping valve stems.

Postby Ross » Sun Feb 11, 2018 8:45 am

I've had problems in the past with Conti lightweight tubes (butyl, not latex) just randomly exploding, the tube split along the seam not the valve coming away from the tube. Luckily not while I've been riding. I just use normal weight butyl tubes now, normally whatever is on special rather than any particular brand (currently using Lifeline from Wiggle with no issues).

twowheels
Posts: 1214
Joined: Mon Apr 23, 2007 6:14 pm
Location: Perth

Re: Popping valve stems.

Postby twowheels » Sun Feb 11, 2018 12:36 pm

I had the same problem with presta tubes. Are you screwing down the nut on the outside of the valve body? I found after I threw the nut away instead the problem went away.

uart
Posts: 1599
Joined: Sat Jan 02, 2016 9:15 pm
Location: Newcastle

Re: Popping valve stems.

Postby uart » Sun Feb 11, 2018 8:25 pm

Be careful about riding too far after you get a puncture or even a slow leak. As the tyre deflates it can sometimes move around on the wheel, causing the valve stem to get bent over and stressed at the base.

Several times I've fixed punctures for people who have ridden like this, only to find that the base of the valve stem gives out when I go to reinstall the tube.

User avatar
Derny Driver
Posts: 2428
Joined: Wed Nov 21, 2012 12:18 pm
Location: Wollongong

Re: Popping valve stems.

Postby Derny Driver » Sun Feb 11, 2018 9:11 pm

My bet is that its a faulty batch of tubes.
Try a different brand.

User avatar
10speedsemiracer
Posts: 1404
Joined: Sat Feb 11, 2017 7:38 pm
Location: Melbourne, in the suburbs, near some hills

Re: Popping valve stems.

Postby 10speedsemiracer » Sun Feb 11, 2018 10:38 pm

Funny enough, I've had a similar experience, with two Conti Race tubes, not the Tour tubes. At the time I thought it was my own fault for over-tightening the valve stem retaining ring nut, however have since shifted to two other brands and haven't had a recurrence.
Mmm, SunTour

kenwstr
Posts: 503
Joined: Tue Apr 23, 2013 8:21 pm

Re: Popping valve stems.

Postby kenwstr » Mon Feb 12, 2018 12:05 pm

Ta for the replies. I generally don't use the valve stem nuts except occasionally as an easy and temporary way to prevent the valve being pushed into the tyre when attaching the pump head. Figure I'll just switch brands and see how that goes. In the meantime I have temporarily resorted to thornies out of frustration.

Ken

jackthelad
Posts: 339
Joined: Sat Nov 15, 2008 12:24 pm
Location: Perth, Western Australia

Re: Popping valve stems.

Postby jackthelad » Wed Feb 14, 2018 3:48 pm

Mountain Biker here
I went Tubeless on my Ultegra 6800 wheels
Running Hutchision Fusion3, Schwable Pro one rear,
on the only road bike i own.
Tubeless to me is a known Quantity, and how it works and behaves..
I run it because with tubes, i kept getting fitment punctures, dues to having cerebral palsy
i could not fit the tyre well, with little muscle strength in one of my hands
i would suggest a tubeless conversion, if your wheels are not already tubeless compatable,
work very well around perth and the thorns here, see no reason, woud not work for you
SantaCruz HighTower LT
SantaCruz Blur XC Carbon
Kona Kula Supreme(Retired/Spare)
Surly Karate Monkey
Ribble Rd Bike

kenwstr
Posts: 503
Joined: Tue Apr 23, 2013 8:21 pm

Re: Popping valve stems.

Postby kenwstr » Wed Feb 14, 2018 10:24 pm

What do you when a tubeless gets a flat 50 km from town and no mobile reception?
Ken

User avatar
Duck!
Expert
Posts: 7119
Joined: Tue May 21, 2013 8:21 pm
Location: On The Tools

Re: Popping valve stems.

Postby Duck! » Thu Feb 15, 2018 12:06 am

Throw a tube in it.

Or plug it.

Or as a get home, then chuck the tyre if it's a bad hole solution, externally patch the tyre.
I had a thought, but it got run over as it crossed my mind.

jackthelad
Posts: 339
Joined: Sat Nov 15, 2008 12:24 pm
Location: Perth, Western Australia

Re: Popping valve stems.

Postby jackthelad » Thu Feb 15, 2018 11:43 pm

kenwstr wrote:What do you when a tubeless gets a flat 50 km from town and no mobile reception?
Ken

Carry a Tube
or Tubeless tyre repair kit ..
SantaCruz HighTower LT
SantaCruz Blur XC Carbon
Kona Kula Supreme(Retired/Spare)
Surly Karate Monkey
Ribble Rd Bike

Who is online

Users browsing this forum: No registered users