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D.5.2 Tire Valves
There are primarily two kinds of bicycle tire valves: The Schrader
Valve and the Presta Valve. The bicycle pump you use must have
the fitting appropriate to the valve stems on your bicycle.
The Schrader valve (Figure 4.16 is like the valve on a car tire. To
inflate a Schrader valve tire, remove the valve cap and clamp the
pump fitting onto the end of the valve stem. To let air out of a
Schrader valve, depress the pin in the end of the valve stem with
the end of a key or other appropriate object.
The Presta valve (Figure 4.17) has a narrower diameter and is only
found on bicycle tires. To inflate a Presta valve tire using a Presta
headed bicycle pump, remove the valve cap; unscrew
(counterclockwise the valve stem lock nut; and push down on the
valve stem to free it up. Then push the pump head on to the valve
head, and inflate. To inflate a Presta valve with a Schrader pump
fitting, you'll need a Presta adapter (available at your bike shop
which screws on to the valve stem once you've freed up the valve.
The adapter fits into the Schrader pump fitting. Close the valve
after inflation. To let air out of a Presta valve, open up the valve
stem lock nut and depress the valve stem.
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Figure 4.16
WARNING!
We highly recommend that you carry a spare inner tube when
you ride your bike, unless the bike is fitted with tubeless tires.
Patching a tube is an emergency repair. If you do not apply the
patch correctly or apply several patches, the tube can fail,
resulting in possible tube failure, which could cause you to lose
control and fall. Replace a patched tube as soon as possible
Figure 4.17