Secondary Retention Devices; Wheels With Cam Action Systems; Adjusting The Traditional Cam Action Mechanism - Flash FLASHV1 User Manual

1. 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:
• 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 reten-
tion 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.

2. Wheels with cam action systems

There are currently two types of over-center cam wheel re-
tention mechanisms: the traditional over-center cam and the
cam-and-cup system. Both use an over-center cam action to
clamp the bike's wheel in place.

Adjusting the traditional cam action mechanism

• 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 be-
tween 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.
34