Bedienungsanleitung Cervelo Multi-speed racing bicycles (Seite 36 von 40) (Englisch)

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Cervélo Owner’s Manual

Factors that lengthen product life:

• Smooth, fluid riding style

• No “hits,” crashes, jumps, other “shots” to bike

• Low mileage

• Lower body weight

• Less aggressive rider

• Non-corrosive environment (dry, salt-free air)

• Clean riding environment

WARNING: Do not ride a bicycle or component with any crack,

bulge or dent, even a small one. Riding a cracked frame, fork or

component could lead to complete failure, with risk of serious

injury or death.

B. Understanding Composites

All riders must understand a fundamental reality of composites.

Composite materials constructed of carbon fibers are strong and light,

but when crashed or overloaded, carbon fibers do not bend, they break.

What Are Composites?

The term “composites” refers to the fact that a part or parts are made

up of different components or materials. You’ve heard the term “carbon

fiber bike.” This really means “composite bike.”

Carbon fiber composites are typically a strong, light fiber in a matrix

of plastic, molded to form a shape. Carbon composites are light relative

to metals. Steel weighs 7.8 grams/cm

(grams per cubic centimeter),

titanium 4.5 grams/cm

, aluminum 2.75 grams/cm

. Contrast these

numbers with carbon fiber composite at 1.45 grams/cm

The composites with the best strength-to-weight ratios are made of

carbon fiber in a matrix of epoxy plastic. The epoxy matrix bonds the

carbon fibers together, transfers load to other fibers, and provides a

smooth outer surface. The carbon fibers are the “skeleton” that

carries the load.

Why Are Composites Used?

Unlike metals, which have uniform properties in all directions

(engineers call this isotropic), carbon fibers can be placed in specific

orientations to optimize the structure for particular loads. The choice

of where to place the carbon fibers gives engineers a powerful tool to

create strong, light bicycles. Engineers may also orient fibers to suit

other goals such as comfort and vibration damping.

Carbon fiber composites are very corrosion resistant, much more so

than most metals. Think about carbon fiber or fiberglass boats.

Carbon fiber materials have a very high strength-to-weight ratio.

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, you must still 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 maybe delamination of

carbon fiber or carbon fiber fabric layers. There will be no bending,

buckling, or stretching.

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Cervelo Multi-speed racing bicycles Seite 36

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