Jamis Bicycle Owner's Manual - page 14
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a. Removing a disk 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 and go to step (4). 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.
b. Installing a disk brake or rim brake Front Wheel
CAUTION: If your bike is equipped with a front disk brake, be careful not to damage the disk, caliper or brake pads when re-
inserting the disk into the caliper. Never activate a disk brake’s control lever unless the disk is correctly inserted in the caliper.
See also Section 4.C.
(1) If your bike has cam action front wheel retention, move the cam lever so that it curves away from the wheel (fig. 8b). This is the OPEN
position. If your bike has through bolt or bolt-on front wheel retention, go to the next step.
(2) With the steering fork facing forward, insert the wheel between the fork blades so that the axle seats firmly at the top of the fork dropouts.
The cam lever, if there is one, should be on rider’s left side of the bicycle (fig. 8a & b). If your bike has a clip-on type secondary retention
device, engage it.
(3) If you have a traditional cam action mechanism: holding the cam lever in the ADJUST position with your right hand, tighten the tension
adjusting nut with your left hand until it is finger tight against the fork dropout (fig. 8a). If you have a cam-and-cup system: the nut and cup
(fig. 8b) will have snapped into the recessed area of the fork dropouts and no adjustment should be required.
(4) While pushing the wheel firmly to the top of the slots in the fork dropouts, and at the same time centering the wheel rim in the fork:
(a) With a cam action system, move the cam lever upwards and swing it into the CLOSED position (fig. 8a & b). The lever should now be
parallel to the fork blade and curved toward the wheel. To apply enough clamping force, you should have to wrap your fingers around
the fork blade for leverage, and the lever should leave a clear imprint in the palm of your hand.
(b) With a through-bolt or bolt-on system, tighten the fasteners to the torque specifications in Appendix D or the hub manufacturer’s
instructions.
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.
CAUTION: If your bike has a disc brake, exercise care in touching the rotor or caliper. Disc rotors have sharp edges, and both rotor and
caliper can get very hot during use.