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PART 2
2. Understanding Composites (Carbon Fiber)
138690 Rev2 (10/22)
Section D. Inspect For Safety
Cannondale Bicycle Owner’s Manual
What Are The Limits Of Composites?
Well designed “composite” or carbon fiber
bicycles and components have long fatigue
lives, usually better than their metal
equivalents.
While fatigue life is an advantage of carbon
fiber, Cannondale still urges you to regularly
inspect your carbon fiber frame, fork, or
components.
Carbon fiber composites are not ductile.
Once a carbon structure is overloaded, it will
not bend; it will break. At and near the
break, there will be rough, sharp edges and
may be delamination of carbon fiber or
carbon fiber fabric layers. There will be no
bending, buckling, or stretching.
If You Hit Something Or Have A Crash, What
Can You Expect From Your Carbon Fiber
Bike?
Let’s say you hit a curb, ditch, rock, car,
fallen cyclist or other object. First, read the
Important warnings at the beginning of
PART II Section A. Bicycles Cannot Protect
You in this manual.
At any speed above a fast walk, your body
will continue to move forward, the
momentum carrying you over the front of the
bike. You cannot and will not stay on the bike
and what happens to the frame and fork is
irrelevant to what happens to your body.
What should you expect from your carbon
frame? It depends on many complex factors,
which is why we tell you that crash
worthiness cannot be a design criteria. With
that important note, we can tell you that if
the impact is hard enough, the fork or frame
may be completely broken. See Figure A on
page 68. Note the significant dierence in
behavior between carbon and metal. 1.
Understanding Metals in this section. Even if
the carbon frame was twice as strong as a
metal frame, once the carbon frame is
overloaded it will not bend, it will break
completely.
Carbon fiber composites are not ductile.
Once a carbon structure is overloaded, it will
not bend; it will break. At and near the
break, there will be rough, sharp edges and
may be delamination of carbon fiber or
carbon fiber fabric layers. There will be no
bending, buckling, or stretching.
Our carbon frames/fork/components are
designed for normal riding loads with a
factor of safety. These frames/fork/
components will be broken by some crash or
impact loads.
See “Composite Frame, Fork, And
Component Inspection” on next page.
138


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