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shop) which screws on to the valve stem once you’ve freed up the valve.
The adapter ts into the Schraeder pump tting. Close the valve after
ination. To let air out of a Presta valve, open up the valve stem lock nut
and depress the valve stem.
WARNING: We highly recommend that you carry a spare inner
tube when you ride your bike. 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 loose control and fall. Replace a
patched tube as soon as possible.
Ask your dealer to recommend the best tire pressure for the kind of
riding you will most often do, and have the dealer inate your tires to that
pressure. Then, check ination as described in Section 1.C so you’ll know
how correctly inated tires should look and feel when you don’t have access
to a gauge. Some tires may need to be brought up to pressure every week
or two, so it is important to check your tire pressures before every ride.
Some special high-performance tires have unidirectional treads: their tread
pattern is designed to work better in one direction than in the other. The
sidewall marking of a unidirectional tire will have an arrow showing the
correct rotation direction. If your bike has unidirectional tires, be sure that
they are mounted to rotate in the correct direction.
2. Tire Valves
There are primarily two kinds of bicycle tube valves: The Schraeder Valve
and the Presta Valve. The bicycle pump you use must have the tting
appropriate to the valve stems on your bicycle.
The Schraeder valve (g. 18a) is like the valve on a car tire. To inate a
Schraeder valve tube, remove the valve cap and clamp the pump tting
onto the end of the valve stem. To let air out of a Schraeder valve, depress
the pin in the end of the valve stem with the end of a key or other
appropriate object.
The Presta valve (g. 18b) has a narrower diameter and is only
found on bicycle tires. To inate a Presta valve tube 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 inate. To inate a Presta valve with a Schraeder
pump tting, you’ll need a Presta adapter (available at your bike
33


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