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PostPosted: Tue Aug 30, 2016 3:27 pm 
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Joined: Fri Nov 16, 2012 4:09 pm
Posts: 30
So since I have "deep" rims, I have to use a longer sized valve tube. For a few years I've used the Continental 80mm tubes.

Problem is, a lot of the time when I'm using a co2 cartridge, or a frame pump when fixing a flat by the side of the road the action of unscrewing the inflating device unscrews the valve core and all the air comes right back out. I try to be as gentle as possible not to over tighten the pump connection, but I'll be damned if half the time no matter how careful I am....

Does anyone have any best practices here? I've been lucky riding in a group the last few times this has happened, but I have nightmares about being at the side of the road in the middle of nowhere holding my... valve core in my hands....


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PostPosted: Tue Aug 30, 2016 4:07 pm 
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Joined: Tue Jul 19, 2016 9:13 pm
Posts: 35
I also had this problem with some tubes and in my experience this is not related to a specific brand. So far, tightening the valve core with pliers has solved the issue for me.


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PostPosted: Tue Aug 30, 2016 4:09 pm 
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Joined: Fri Nov 16, 2012 4:09 pm
Posts: 30
PhilippCX wrote:
I also had this problem with some tubes and in my experience this is not related to a specific brand. So far, tightening the valve core with pliers has solved the issue for me.


Were you pre-tightening them?

Last Saturday I rode out of a buddies place and had a flat when I went to leave, and was able to borrow a pair of needle nose pliers. But I don't really want to take a set with me on the road. :)


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PostPosted: Tue Aug 30, 2016 4:36 pm 
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Joined: Tue Jul 19, 2016 9:13 pm
Posts: 35
Basically a couple of times when inflating the tire at home I unscrewed the valve core when undoing the chuck of the pump. Being fed up with this I tightend the cores properly and never had any issues since.

To be on the safe side, you could also use a tiny bit of Locktite.


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PostPosted: Tue Aug 30, 2016 5:26 pm 
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Joined: Fri Dec 24, 2010 9:37 pm
Posts: 913
Location: it's raining, it must be uk
imho conti tubes ship with the valves loose, i always tighten them with pliers (two pairs, onew to hold the stem, one to screw in the valve), once that's done i've had no problem using a lezyne screw-on pump head

if you're not going to ever need to remove the core (i.e. to put sealant in) then a dab on loctite will make sure the core stays put


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PostPosted: Tue Aug 30, 2016 5:28 pm 
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Joined: Fri Nov 16, 2012 4:09 pm
Posts: 30
sungod wrote:
imho conti tubes ship with the valves loose, i always tighten them with pliers (two pairs, onew to hold the stem, one to screw in the valve), once that's done i've had no problem using a lezyne screw-on pump head

if you're not going to ever need to remove the core (i.e. to put sealant in) then a dab on loctite will make sure the core stays put


Brilliant. Thanks to you both! I'm going to go through my spares and loctite them all!


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