Kona bicycle Owner's Manual page 18

Discuss the wheel securing method for your bicycle with
your dealer.
It is very important that you understand the type of
wheel securing method on your bicycle, that you know
how to secure the wheels correctly, and that you know
how to apply the correct clamping force that safely
secures the wheel. Ask your dealer to instruct you in
correct wheel removal and installation, and ask him to
give you any available manufacturer's instructions.
WARNING: Riding with an improperly secured
wheel can allow the wheel to wobble or fall off the
bicycle, which can cause serious injury or death.
Therefore, it is essential that you:
1. Ask your dealer to help you make sure you know
how to install and remove your wheels safely.
2. Understand and apply the correct technique for
clamping your wheel in place.
3. Each time, before you ride the bike, check that the
wheel is securely clamped.
The clamping action of a correctly secured wheel must
emboss the surfaces of the dropouts.
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
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outer faces of the front fork dropouts.
Ask your dealer to explain the particular secondary reten-
tion 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.
2. Wheels with cam action systems
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.