Diamondback BMX 2008-2005 - Manual (Page 21)


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 fitting appropriate to the
valve stems on your bicycle.
The Schraeder valve (fig. 17) is like the
valve on a car tire. To inflate 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 (fig. 18) has a narrower diameter and is
only found on bicycle tires. To inflate 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 inflate. To inflate a Presta valve with a
Schraeder pump fitting, 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 fits into the Schraeder
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.
!
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 specifically 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.