Bedienungsanleitung Kona 2022 (Seite 43 von 45) (Englisch)

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KONA OWNER’S MANUAL

composite materials, resulting in component failure

which could cause you 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 41

What Are The Limits Of Composites?

Well designed “composite” or carbon ber bicycles and

components have long fatigue lives, usually better than

their metal equivalents.

While fatigue life is an advantage of carbon ber, you

must still regularly inspect your carbon ber frame,

fork, or components.

Carbon ber 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

maybe delamination of carbon ber or carbon ber fabric

layers. There will be no bending, buckling, or stretching.

If You Hit Something Or 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

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