Feb 11, 2003 2:46 PM
|Just got a pair of zipp 404's and I also have some valve extenders. are the extenders suppose to be left on at all times, or just used when inflating the tire? the valve
sticks out about 3/8 of an inch without the extender.
Feb 11, 2003 3:16 PM
|I leave them on. They go on better if you install them on the valve before intalling the tube in the tire, as you can get them a little tighter. I assume you have some short extenders.
What valve sticks out 3/8" without an extender?
Feb 11, 2003 5:06 PM
|Tubes with 80mm valve. No extension needed for 404's.
Expensive at 14.95 but considering the fact that the wheels cost $600.00, and the tubes are good for a season, ......
|re: Valve extenters||pa rider|
Feb 11, 2003 3:35 PM
|Not trying to give different information then doug, but did you try long stem tubes? I had the 60mm on my ksyriums last year and they worked well. I thought the cost was high so I got the extenders in case I needed to borrow someone else tube in emergency.
I thought the cost was a little high, plus people were bumming tubes off of me, so I went to the short stems again. They only cost $4.95 contential long stems at excel sport.
I seemed to lose more air with the extenders on. I was lucky enough that the wheels could take a short stem, but need to play with the pump to get it to work. I keep them with my spare tube and haven't needed to use them yet.
I was just wondering if you tried the long stem and didn't like them, so you went with the extenders.
Feb 11, 2003 3:43 PM
|I'd bet I've changed a hundred or so tubes in Ksyriums, and I've always used standard valves. No problem. At first, you might have to push the valve up from tire side to engage the pump head, but after air is in, no need.
|re: Valve extenters||al0|
Feb 12, 2003 1:30 AM
|Hutchinson has long stem tubes and cost is the same as for standard valve tubes (if any difference exists it is neglible).|
|... what I do...||Akirasho|
Feb 11, 2003 7:39 PM
|... there are cases where you can find tubes with extra long valve stems... but if you're forced/want to use an extender, here's what I do to ensure a good seal.
Open the valve core completely. Wrap the threads of the valve stem with a bit of teflon tape taking care not to occlude the valve itself. Carefully apply a drop of Blue Loctite (and Blue only) to the teflon/threads... and carefully engage the extender (taking care not to close the valve core or get Loctite anywhere but the thread interface). This'll create a relatively secure airtight seal... and while you won't be able to duplicate this out on the road... there should be enough tape residue left on the stem should you need to repair the tube (you might also wanna pre wrap a spare tube if you carry it). Also note, it helps to carry a small length of scrap brake cable (soldered at both ends) in your repair kit... makes it easier to stick down the extender to actuate the core if necessary.
I run a set of 404s and have had success with both extenders and extra long valved tubes. I also run a set of HED Deeps where extenders are the only option currently available (90mm).
Be the bike.
|... what I do...||S-U-B|
Feb 11, 2003 8:48 PM
|Thanks guys.|| |