Front Wheel Secondary Retention Devices; Wheels With Cam Action Systems - Specialized Roubaix Comp Road Manual De Instrucciones

4. The clamping action of a correctly secured wheel must emboss
the surfaces of the dropouts.
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.
There are currently two types of over-center cam wheel retention
mechanisms: the traditional over-center cam (fig. 8a) and the cam-and-cup
system (fig. 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 (fig. 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.

1. Front Wheel Secondary Retention Devices

2. Wheels with cam action systems

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