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2. Wheels with cam action systems
There are currently two types of over-center cam wheel retention
mechanisms: the traditional over-center cam (g. 8a) and the cam-and-cup
system (g. 8b). Both use an over-center cam action to clamp the bike’s
wheel in place. Your bicycle may have a cam-and-cup front wheel retention
system and a traditional rear wheel cam action system.
a. Adjusting the traditional cam action mechanism (g. 8a)
The wheel hub is clamped in place by the force of the over-center cam
pushing against one dropout and pulling the tension adjusting nut, by way
of the skewer, against the other dropout. The amount of clamping force is
controlled by the tension adjusting nut. Turning the tension adjusting nut
clockwise while keeping the cam lever from rotating increases clamping
force; turning it counterclockwise while keeping the cam lever from rotating
reduces clamping force. Less than half a turn of the tension adjusting nut
can make the difference between safe clamping force and unsafe clamping
force.
WARNING: The full force of the cam action is needed to clamp
the wheel securely. Holding the nut with one hand and turning
the lever like a wing nut with the other hand until everything is
as tight as you can get it will not clamp a cam action wheel
safely in the dropouts. See also the rst WARNING in this
Section, p. 18.
b. Adjusting the cam-and-cup mechanism (g. 8b)
The cam-and-cup system on your front wheel will have been correctly
adjusted for your bicycle by your dealer. Ask your dealer to check the
adjustment every six months. Do not use a cam-and-cup front wheel on
any bicycle other than the one for which your dealer adjusted it.
1. Front Wheel Secondary Retention Devices
Most bicycles have front forks which utilize a secondary wheel retention
device to reduce the risk of the wheel disengaging from the fork if the
wheel is incorrectly secured. Secondary retention devices are not a
substitute for correctly securing your front wheel.
Secondary retention devices fall into two basic categories:
a.The clip-on type is a part which the manufacturer adds to the front wheel
hub or front fork.
b. The integral type is molded, cast or machined into the outer faces of the
front fork dropouts.
Ask your dealer to explain the particular secondary retention device on
your bike.
WARNING: Do not remove or disable the secondary retention
device. As its name implies, it serves as a back-up for a critical
adjustment. If the wheel is not secured correctly, the secondary
retention device can reduce the risk of the wheel disengaging
from the fork. Removing or disabling the secondary retention
device may also void the warranty.
Secondary retention devices are not a substitute for correctly
securing your wheel. Failure to properly secure the wheel can
cause the wheel to wobble or disengage, which could cause
you to loose control and fall, resulting in serious injury or
death.
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