Bedienungsanleitung Kona 2020 (Seite 42 von 44) (Englisch)

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KONA OWNER’S MANUAL

• Stronger, more t, more aggressive rider

• Corrosive environment (wet, salt air, winter road salt,

accumulated sweat)

• Presence of abrasive mud, dirt, sand, soil in riding

environment

Factors that lengthen product life:

• Smooth, uid riding style

• No “hits”, crashes, jumps, other “shots” to the 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 com-

plete 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 bers are strong and light, but when crashed or

overloaded, carbon bers 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 materi-

als. You’ve heard the term “carbon ber bike.” This really

means “composite bike.”

Carbon ber composites are typically a strong, light ber

in a matrix of plastic, molded to form a shape. Carbon

composites are light relative to metals. Steel weighs 7.8

grams/cm3 (grams per cubic centimeter), titanium 4.5

grams/cm3, aluminum 2.75 grams/cm3. Contrast these

numbers with carbon ber composite at 1.45 grams/

cm3.

The composites with the best strength-to-weight ratios

are made of carbon ber in a matrix of epoxy plastic.

The epoxy matrix bonds the carbon bers together,

transfers load to other bers, and provides a smooth

outer surface. The carbon bers are the “skeleton” that

carries the load.

Why Are Composites Used?

Unlike metals, which have uniform properties in all di-

rections (engineers call this isotropic), carbon bers can

be placed in specic orientations to optimize the struc-

ture for particular loads. The choice of where to place

the carbon bers gives engineers a powerful tool to

create strong, light bicycles. Engineers may also orient

bers to suit other goals such as comfort and vibration

damping. Carbon ber composites are very corrosion

resistant, much more so than most metals. Think about

carbon ber or berglass boats. Carbon ber materials

have a very high strength-to-weight ratio.

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 com-

ponents

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.

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Kona 2020 Seite 42

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