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Need help installing valve extensions(11 posts)

Need help installing valve extensionsmanofsteel
Nov 5, 2002 10:11 PM
I just purchased a used set of Zipp 530 wheels. This is my first experience with carbon deep dish rims in which valve extensions come into play and I am having a heck of a time pumping air without leakage. I was told by my LBS to first thread the valve stems with teflon tape before screwing on the extensions. I tried it today and air still leaks but very slowly. Do I need tubes with shorter valve stems? What am I doing wrong and what needs to be done to adequately retain air pressure. I'm also thinking about what happens when I puncture during a ride. Should I keep a spare tube already equipped with a tightly sealed valve extension? Or am I out of luck and keep the cell handy so I can call the gf for a ride? Please enlighten me. Any comments/suggestions are well appreciated.
First, get decent extensionsStarliner
Nov 5, 2002 10:39 PM
If the extensions you are using are the aluminum shell type, yank them and throw them in the recycling bin. Then get some good ones:

http://www.excelsports.com/new.asp?page=8&major=1&minor=31&description=Presta+Valve+Extenders%28Pair%29&vendorCode=VITT

NOTE: your tubes must have a removeable valve core.
Those are kinda cool extenderspmf1
Nov 6, 2002 5:41 AM
However, they require tubes with removable valve cores. I'd worry that in a pinch, what if you couldn't find them? Pretty much the same problem as tubes with extended valves -- they work great, but what if you need a tube in the middle of a century? None of my buddies carry them.
How about a different brand of tubes?Allez Rouge
Nov 6, 2002 5:22 AM
Last tire change, I decided to try Vredestein tubes after having them recommended by a few folks. They came with valve stem extensions already installed. I didn't need the extensions with my Open 4 rims but having no experience with these things, I didn't know whether they screwed off or snapped off. So I mounted them up and rode the bike for a couple weeks with the extensions in place. No leaks at all. I subsequently learned that the extensions screwed out, and removed them.

I ordered the tubes from Colorado Cyclist. Don't recall the exact cost but it was right in the ballpark with other quality tubes (I have learned that using good tubes goes a long, LONG way toward eliminating flats, so I never fool with the cheaper house brands).
re: Need help installing valve extensionspmf1
Nov 6, 2002 5:36 AM
I've had 2 sets of Spinergy Rev-X wheels for years and they definitely need valve stems. Spinergy sells them, but any model will work. They screw into the valve stem of your tube. All tubes have threaded stems. You do not need to get the tubes with extra long stems unless you want to (these are expensive and typically not be available when you really need one). You do not need teflon tape on the threads. In fact, that may be your problem. Make sure you unscrew the valve core before you install them. Also make sure that when you screw the extension in, you are not also screwing the valve core in. Sometimes this happens and I use a tiny hex wrench to unscrew the valve core (just stick it into the extender and move it around counter clockwise). If the valve core is screwed in, it will sound like all the air is leaking out when you try to pump your tires.

As for the extenders, I leave them on the wheels at all times. Just leave them on there and they will never get lost. Don't worry about screwing the valve core shut. Extenders can break (usually when you're on the side of the road, 50 miles from home trying to inflate your tire with a frame pump) and its not a bad idea to carry an extra in your bag.

Take care in crosswinds. Deep dish wheels will get your attention fast in a strong cross wind.

Enjoy the Zipp wheels -- I've always wanted a pair.
re: Valve StemsChen2
Nov 6, 2002 6:51 AM
I'm not familliar with the Zipp model 530, but I do know that tubes with valve stems up to 80mm are available. I use Performance tubes with 60mm stems on my Cosmic Carbones, and they hold up very well. Are you sure you need extenders? How deep are your rims?
~Al
re: Valve Stemsmanofsteel
Nov 6, 2002 10:07 PM
Thanks Chen2! I think you may have just solved my problem. My only concern is availability of 60 or 80mm tubes in bike shops. I'll check all lbs tomorrow. Thanks to all for your input and advice. manofsteel
Just a word of warningpmf1
Nov 7, 2002 5:22 AM
You can generally find longer stem tubes at most bike shops. They often cost a few dollars more. The problem is that when you're out on a ride, say a century, and you get multiple flats (it happens). Once you're out of those tubes, you're basically SOL. Chances are that none of your buddies will have one to loan you and the guys in the SAG car won't have any either.

If you want to use deep dish rims, you're best off getting proficient with valve extenders. Its really not that much trouble once you get used to it.
Good point, butChen2
Nov 7, 2002 9:09 AM
I carry one or two extra tubes, a patch kit and one or two Mavic extenders that I've never used. I also carry a 3" long section of tube rubber to use as a tire boot, and I have had to use it, but that's another subject.
~Al
Me toopmf1
Nov 7, 2002 9:43 AM
I always carry two tubes (among other things). I have on occasion been on long rides and had need for more than two tubes. Sometimes that new tube out of the box has a hole in it. It happens.

Having something like this happen is a very rare occurance. But getting stranded sucks. I remember breaking my first chain. After that I always carry a chain tool. Only needed it twice in the last 10 years (not counting other people's chains that I've fixed), but when I did I was sure glad I had it.

I still think this guy should learn how to make an extender work, just in case he needs one.
re: Valve StemsChen2
Nov 7, 2002 9:14 AM
Yeah, my LBS carries 55, 60, and 80mm long stem tubes. But I also order 60mm tubes from Performance. If your LBS doesn't have what you need you can probably find them on line. I keep a big supply in my garage even though I don't have many flats, maybe one or two a year.
~Al