Valve extenders should be installed before the tube or tire is installed or glued on.
Unscrew your valve as you normally would to pump up your tire, then grip it tightly and give it an extra twist open. You want to wedge the stem open so that it will not vibrate shut while riding.It is not a bad idea to put an extender on your spare tube or tire, it is one less thing to mess with on the road if you get a flat.
Technical:
Materials
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FAQ
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How To's:
Wheel Magnets
Valve Extenders
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