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Tubes come with several different valve lengths to
accommodate different wheel profiles. Most bicycle wheels will work fine
with 32mm valve lengths, but higher-end bicycles are often equipped with
"aero" wheels which having a higher rim profile necessitating a longer
valve stem. You should have enough valve sticking through the rim to
easily attach your pump. With most pumps and inflators, about a half
inch will do the trick. If you think you might have a problem with the
shorter valve length, using a longer valve tube will not cause any real
problems. The only real downsides are increased aerodynamic drag and
weight (both of which are pretty minimal) and aesthetics.
If you have a very deep rim profile, even the
longest valve stems may not be adequate. For these cases, we sell valve
extenders which screw onto the standard Presta valve to add additional
length.
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