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Average Customer Review:
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0 of 1 found the following review helpful:
 Pretty terribleApr 08, 2010
I purchased these to replace a pair of Zipp valve extenders I was using on a set of 404s. I found that the Zipp extenders didn't allow the pump to attach securely, so topping off the tires was always a two person job. Reviews of the Topeaks (like the ones here) suggest that pumps will attach securely. Sadly, this turns out to not be the case, and I've tried it with a number of different pumps. And the valves, once the pump is attached, will release nearly as much air as your putting in. I understand that some people have no problems with this, but if I were in the market again, I'd just buy 80mm tubes (which I have since done). I recognize that that isn't an option for people running really deep rims.
 Topeak Presta Valve ExtenderDec 06, 2009
I have used two of these extenders on a pair of deep-V rim BMX wheels with 20x1.5 tires for the last two years. I have had no problems with them at all. They seal to the valve stem securely, they allow the Presta valve to be tightened hard enough so it doesn't not untightened no matter how rough the ride, the pump attaches securely to them and the black finish shows no wear. It is pleasure to use them because they do their job superbly. And, in addition, they're less expensive than many other valve extenders.
10 of 10 found the following review helpful:
 Best overall solution presta valve extenderFeb 18, 2007
Only need one extender to inflate many tires. With this Topeak presta valve extender, you do not need to leave in place the extender once it is installed, since this extender features a plunger that is used to tighten/untighten the the knurled nut on the existing presta valve.
Procedure I use: Screw the extender onto existing valve, push the plunger down to engage the valve nut, losen the nut and proceed to inflate. Once the tire is properly inflated, tighten the nut, disengage the plunger by pulling it up few milimeters, and remove the extender by unscrewing it. Repeat as necessary on as many tires as you wish.
If needed for competition conditions, you may use two extenders and leaving them in place on each tire for fast access. There is no need to use teflon tape with these extenders, since you are using the existing valve nut to close it down.
The only drawback with this product is, that you may not be able to tighten the presta valve's knurled nut real hard as you may have been accustomed to, and could become lose with road vibrations, thus leaking some air. This has not happened to me since the three months I have been using this valve extender.
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