// MANUAL
B. SEAT POST CAM ACTION CLAMP
Some bikes are equipped with a cam action seat post binder. The seat post cam action binder
works exactly like the traditional wheel cam action fastener (Section 4.A.2). While a cam action
binder looks like a long bolt with a lever on one end and a nut on the other, the binder uses an
over-center cam action to rmly clamp the seat post (see g. 8a).
WARNING: Riding with an improperly tightened seat post can allow the saddle to
turn or move and cause you to lose control and fall. Therefore:
1. Ask PROPAIN or your dealer to help you make sure you know how to correctly clamp
your seat post.
2. Understand and apply the correct technique for clamping your seat post.
3. Before you ride the bike, rst check that the seat post is securely clamped.
Adjusting the seat post cam action mechanism:
The action of the cam squeezes the seat collar around the seat post to hold the seat post se-
curely in place. The amount of clamping force is controlled by the tension adjusting nut. Turn-
ing 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 and unsafe clamping force.
WARNING: The full force of the cam action is needed to clamp the seat post secu-
rely. 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 the seat post safely.
WARNING: If you can fully close the cam lever without wrapping your ngers around
the seat post or a frame tube for leverage, and the lever does not leave a clear imprint in
the palm of your hand, the tension is insucient. Open the lever; turn the tension adjusting
nut clockwise a quarter turn; then try again.
C. BRAKES
There are three general types of bicycle brakes: rim brakes, which operate by squeezing the
wheel rim between two brake pads; disc brakes, which operate by squeezing a hub-mounted
disc between two brake pads; and internal hub brakes. All three can be operated by way of a
handlebar mounted lever. On some models of bicycle, the internal hub brake is operated by
pedaling backwards. This is called a Coaster Brake and is described in Appendix D.
WARNING:
1. Riding with improperly adjusted brakes, worn brake pads, or wheels on which the rim
wear mark is visible is dangerous and can result in serious injury or death.
2. Applying brakes too hard or too suddenly can lock up a wheel, which could cause you
to lose control and fall. Sudden or excessive application of the front brake may pitch the
rider over the handlebars, which may result in serious injury or death.
3. Some bicycle brakes, such as disc brakes (g. 11) and linear-pull brakes (g. 12),
are extremely powerful. Take extra care in becoming familiar with these brakes and
exercise particular care when using them.
4. Some bicycle brakes are equipped with a brake force modulator, a small, cylindrical
device through which the brake control cable runs and which is designed to provide a
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