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D.2 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. 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 firmly clamp the seat
post (see Figure 3.18).
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 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, first check that the seat post is
securely clamped.
D.2.1 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 securely in place. 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 and
unsafe clamping force.
WARNING!
The full force of the cam action is needed to clamp the seat post
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 the seat post safely.
If you can fully close the cam lever without wrapping your
fingers 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 insufficient. Open the lever; turn the tension
adjusting nut clockwise a quarter turn; then try again.
Tech D
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