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Old 06-19-06, 08:13 AM   #1
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Valve Extenders - What am I doing wrong?

I have Velocity Deep V's which require tubes with long presta valves. The spare tubes use regular length presta valves so I bought a valve extender that screws onto the presta valve to make it long enough to use with the Deep V rims.

Well today I had a flat so I swapped the tube and added the valve extender. I removed the nut that holds the valve against the outside of the rim and put the extender on and finger tightened as much as I could. I made sure to loosen the nut on the valve so I could inflate it before I put the extender on. The extender itself doesn't have a tightening nut and is really just a long cylinder that threads onto the valve. When I started pumping, I couldn't inflate the tube more than maybe 30-40lbs/in pressure before the air would would leak around the seal between the pump and valve extender. This wasn't enough to ride on so I ended up walking the rest of the way to work.

Does anybody have any experience with these extenders? What am I doing wrong? Any insight would be appreciated.
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Old 06-19-06, 08:35 AM   #2
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Does the extender require you to use tubes with a removable valve core? If so, did you move the valve core to the end of the extender?
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Old 06-19-06, 08:52 AM   #3
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Originally Posted by NoRacer
Does the extender require you to use tubes with a removable valve core? If so, did you move the valve core to the end of the extender?
Nope. The only thing I can see from the instructions that I didn't do was wrap the valve w/ teflon plumbers tape.
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Old 06-19-06, 09:02 AM   #4
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I'm not too good with valve extenders either. I've had better luck, when there's enough valve stem sticking out, with the a Schraeder adapater as an "extender".
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Old 06-19-06, 09:09 AM   #5
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Forte road tubes from Performance have long valve stems, might be worth checking out.
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Old 06-19-06, 09:14 AM   #6
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If you do want to use valve extenders, use Teflon plumbers' tape on the threads of the valve, or pipe-thread sealant, you know the toothpaste-type stuff. But the long-valve tubes are sounding like a winner here
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Old 06-19-06, 09:14 AM   #7
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Quote:
Originally Posted by jyossarian
I have Velocity Deep V's which require tubes with long presta valves. The spare tubes use regular length presta valves so I bought a valve extender that screws onto the presta valve to make it long enough to use with the Deep V rims.

Well today I had a flat so I swapped the tube and added the valve extender. I removed the nut that holds the valve against the outside of the rim and put the extender on and finger tightened as much as I could. I made sure to loosen the nut on the valve so I could inflate it before I put the extender on. The extender itself doesn't have a tightening nut and is really just a long cylinder that threads onto the valve. When I started pumping, I couldn't inflate the tube more than maybe 30-40lbs/in pressure before the air would would leak around the seal between the pump and valve extender. This wasn't enough to ride on so I ended up walking the rest of the way to work.

Does anybody have any experience with these extenders? What am I doing wrong? Any insight would be appreciated.
Yep...i use Hutchinson Race tubes with 3" stems
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Old 06-19-06, 09:32 AM   #8
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Yeah, I'm gonna swing by the LBS for the proper tube, but this is what I had with me, so I figured I must've been doing something wrong. I don't have any plumbers tape in my tool kit, just a wrench, tube and levers.
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Old 06-19-06, 10:01 AM   #9
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I squeeze the pump head onto the valve really hard while pumping and that seems to take care of the leaking.
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Old 06-19-06, 11:41 AM   #10
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Turns out plumbers tape or an O-ring is what I needed to make the extender seal properly. I don't have either in my toolkit, so instead I got some tubes w/ extra long valves that did the trick. I guess I could've gotten some plumbers tape at Home Depot. I was about 8 blocks away, but I didn't think of it at the time. Thanks all!
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