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’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 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 lose control
and fall. Replace a patched tube as soon as possible.
4FSWJDF
!
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 manufac-
turer.
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.
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