Bedienungsanleitung Cervelo Multi-speed racing bicycles (Seite 37 von 40) (Englisch)

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Cervélo Owner’s Manual

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 significant 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.

Inspection of Composite Frame, Fork, and Components

Cracks:

Inspect for cracks, broken, or splintered areas. Any crack is serious. Do

not ride any bicycle or component 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.

• Bent or broken rear derailleur hanger. When an impact is sustained

by the rear of the bike, or too much load is placed on the rear

derailleur, the rear derailleur hanger is designed to absorb energy

independent of the frame by breaking or bending. This protects

the frame from greater potential damage than would otherwise

occur. If the hanger is bent or broken it must be replaced before

riding, as a deformed hanger can cause drivetrain interference

with the rear wheel, potentially resulting in a crash. If damage to

the derailleur hanger is discovered, carefully inspect the entire

frame for cracks before riding, as this is a signal that excessive force

was applied to the drivetrain area, and may have resulted in other

damage to the bicycle.

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

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Cervelo Multi-speed racing bicycles Seite 37

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