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1. Front Wheel Secondary Retention Devices
Most bicycles have front forks that 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 that 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.
Contact a bicycle specialist 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 lose control and fall, resulting in serious injury or death.
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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
(Figure 4.1) and the cam-and-cup system. 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
(Figure 4.1)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 first WARNING in this Section.