If you'll race your disc, this is where you might want to consider the style of valve extender. Best to choose your tire or tube valve length with your disc in mind, then choose an adapter to lengthen the valve as needed so that it protrudes the proper amount from your front race rim. If you buy one of those Continental tubes with an 80mm valve stem, thinking you won't need a valve extender for your 40mm or 60mm rim, how is that tube going to work on a HED3 or a Zipp disc if that's your other wheel? You might not have enough room to get a pump head or even a crack pipe on there, once the tube is mounted. Still, where they recommend grease I'm a Teflon tape fan, as is former SRAM/Zipp employee (and now Slowtwtich tech editor) Greg Kopecky (I link to his how-to here on Slowtwitch a little further below).Īre you riding a disc in the rear? If so, the length of the stem is important. For these kinds of extenders that work with removable cores Zipp has a nice how-to. But it depends on what the valve stem length is on the tube you're using. Zipp makes 4 extenders for removable valve cores, and it recommends using the 27mm for its 303 model wheels, 41mm for 404s, 65mm for the 808, and 91mm for 1080 models. But a Continental 42mm valve stem along with Conti's 30mm extender would give you about 30mm above a 40mm-deep rim. It would be an awful lot of stem sticking up and out of a 40mm rim. If you stuck this combo through a Zipp 808 you'd have about 40mm of this construct sticking outside the rim and that's certainly enough and maybe slightly more than ideal. So, for example, Mavic makes a tube with a 48mm valve stem and they make a 70mm extender, totaling about 120mm of length. Below are two lists: common clincher tubes and their lengths, and commonly used valve extenders. You don't want to have a whole bunch of valve stem sticking out there, so think about what stem length comes on the tire or tube you're using or intend to use and marry that with the right length extender. Why would you want to do this? If you want to expose the presta valve, outside of a deep dish rim, you need a valve extender that sits in between your valve and your tube or tire's valve stem – the case in the image adjacent. A removable core means you can unscrew the presta valve from the valve stem. There are two kinds of presta valve styles, removable versus fixed cores. If you have race wheels, you want to make sure that you have tires/tubes and valve extenders that are compatible with each other. Think strategically about how you're going to deal with this.
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