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Kona 2021 Manual

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KONA OWNER’S MANUAL
43
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, other cyclist or
other object. 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 fork and
other components 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. Note the signicant difference in
behavior between carbon and metal. See Section 2. A,
Understanding metals in this Appendix. 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.
WARNING: Be aware that high temperatures in
a conned environment can affect the integrity
of composite materials, resulting in component fail-
ure which could cause to lose control and fall.
Inspection of Composite Frame, Fork, & Components
Cracks: Inspect for cracks, broken, or splintered areas.
Any crack is serious. Do not ride any bicycle or compo-
nent that has a crack of any size.
Delamination: Delamination is serious damage.
Composites are made from layers of fabric. Delamination
means that the layers of fabric are no longer bonded
together. Do not ride any bicycle or component that has
any delamination. These are some delamination clues:
•
A cloudy or white area. This kind of area looks different from
the ordinary undamaged areas. Undamaged areas will look
glassy, shiny, or “deep,” as if one was looking into a clear
liquid. Delaminated areas will look opaque and cloudy
.
• Bulging or deformed shape. If delamination occurs, the
surface shape may change. The surface may have a bump,
a bulge, soft spot, or not be smooth and fair.
• A difference in sound when tapping the surface. If you
gently tap the surface of an undamaged composite you will
hear a consistent sound, usually a hard, sharp sound.
If you then tap a delaminated area, you will hear a different
sound, usually duller, less sharp.
Unusual Noises: Either a crack or delamination can cause
creaking noises while riding. Think about such a noise as a
serious warning signal. A well maintained bicycle will be very
quiet and free of creaks and squeaks. Investigate and nd
the source of any noise. It may not be a crack or delamina-
tion, but whatever is causing the noise must be xed before
riding.
WARNING: Do not ride a bicycle or component with
any delamination or crack. Riding a delaminated or
cracked frame, fork or other component could lead to
complete failure, with risk of serious injury or death.
C) UNDERSTANDING COMPONENTS
It is often necessary to remove and disassemble components
in order to properly and carefully inspect them. This is a job
for a professional bicycle mechanic with the special tools, skills
and experience to inspect and service today’s high-tech high-
performance bicycles and their components
.
… 45


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