PROPAIN tyee 2020 - Front Wheel Secondary Retention Devices; Wheels with Cam Action Systems

// MANUAL
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 PROPAIN or 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 correct-
ly, 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 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 drop-
outs. 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 PROPAIN or your dealer. Ask a bicycle 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.