Nirve Bicycle - Secondary Retention Devices; Wheels with Cam Action Systems; Removing and Installing Wheels

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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.
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, p. 18.
b. Adjusting the cam-and-cup mechanism (fig. 8b)
The cam-and-cup system on your front wheel will have been correctly adjusted for your bicycle by your dealer. Ask your 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.
3. Removing and Installing wheels
WARNING: If your bike is equipped with a hub brake such as a rear coaster brake, front or rear drum, band or roller brake; or if it
has an internal gear rear hub, do not attempt to remove the wheel. The removal and re-installation of most hub brakes and
internal gear hubs requires special knowledge. Incorrect removal or assembly can result in brake or gear failure, which can cause you
to lose control and fall.