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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. 17) is like the
valve on a car tire. To inate a Schraeder
valve tube, remove the valve cap and
clamp the pump head 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. 18) has a narrower
diameter and is only found on bicycle tires.
To inate 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 inate. To inate a
Presta valve with a Schraeder pump tting, you 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 ts
into the Schraeder pump tting. Close the valve after ination.
To let air out of a Presta valve, open up the valve stem lock
nut and depress the valve stem.
!
WARNING: 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.
5. Service
!
WARNING: Technological advances have made bicycles
and bicycle components more complex, and the pace of
innovation is increasing. It is impossible for this manual to
provide all the information required to properly repair and/or
maintain your bicycle. In order to help minimize the chances
of an accident and possible injury, it is critical that you have
any repair or maintenance which is not specically described
in this manual performed by your dealer. Equally important
is that your individual maintenance requirements will be
determined by everything from your riding style to geographic
location. Consult your dealer for help in determining your
maintenance requirements.
!
WARNING: Many bicycle service and repair tasks require
special knowledge and tools. Do not begin any adjustments
or service on your bicycle until you have learned from your
dealer how to properly complete them. Improper adjustment or
service may result in damage to the bicycle or in an accident
which can cause serious injury or death.
If you want to learn to do major service and repair work
on your bike, you have three options:
1. Ask your dealer for copies of the manufacturer’s
installation and service instructions for the components on
your bike, or contact the component manufacturer.
2. Ask your dealer to recommend a book on bicycle repair.
3. Ask your dealer about the availability of bicycle repair
courses in your area.
Regardless of which option you select, we recommend
that you ask your dealer to check the quality of your work the