18
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:
t
he
full
forCe
of
the
Cam
aCtion
is
needed
to
Clamp
the
wheel
seCurely
. h
olding
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
. s
ee
also
the
first
warning
in
this
s
eCtion
,
p
. 17.
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:
i
f
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
. t
he
removal
and
re
-
installation
of
most
hub
brakes
and
internal
gear
hubs
requires
speCial
knowledge
. i
nCorreCt
removal
or
assembly
Can
result
in
brake
or
gear
failure
,
whiCh
Can
Cause
you
to
lose
Control
and
fall
.
CAUTION:
i
f
your
bike
has
a
disC
brake
,
exerCise
Care
in
touChing
the
rotor
or
Caliper
. d
isC
rotors
have
sharp
edges
,
and
both
rotor
and
Caliper
Can
get
very
hot
during
use
.
a. Removing a Disc Brake or Rim Brake Front Wheel
(1) If your bike has rim brakes, disengage the brake’s quick-release mechanism to increase
the clearance between the tire and the brake pads (See Section 4.C fig. 11 through 15).
(2) If your bike has cam action front wheel retention, move the cam lever from the locked or
CLOSED position to the OPEN position (figs. 8a & b). If your bike has through bolt or bolt-
on front wheel retention, loosen the fastener(s) a few turns counter-clockwise using an
appropriate wrench, lock key or the integral lever.
(3) If your front fork has a clip-on type secondary retention device, disengage it. If your front
fork has an integral secondary retention device, and a traditional cam action system
(fig. 8a) loosen the tension adjusting nut enough to allow removing the wheel from the
dropouts. If your front wheel uses a cam-and-cup system, (fig. 8b) squeeze the cup and
cam lever together while removing the wheel. No rotation of any part is necessary with the
cam-and-cup system. You may need to tap the top of the wheel with the palm of your hand
to release the wheel from the front fork.
Содержание Bike
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