Bedienungsanleitung Cervelo Multi-speed racing bicycles (Seite 33 von 40) (Englisch)

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Cervélo Owner’s Manual

WARNING: Frequent inspection of your bike is important to

your safety. Follow the Mechanical Safety Check in Section

1.C of this Manual before every ride.

Periodic, more detailed inspection of your bicycle is

important. How often this more detailed inspection is

needed depends upon you. You, the rider/owner, have

control and knowledge of how often you use your bike,

how hard you use it and where you use it. Because your

dealer cannot track your use, you must take responsibility

for periodically bringing your bike to your dealer for

inspection and service. Your dealer will help you decide

what frequency of inspection and service is appropriate for

how and where you use your bike.

For your safety, understanding and communication with your

dealer, we urge you to read this Appendix in its entirety. The

materials used to make your bike determine how and how

frequently to inspect.

Ignoring this WARNING can lead to frame, fork or other

component failure, which can result in serious injury or death.

A. Understanding Metals

Steel is the traditional material for building bicycle frames. It has good

characteristics, but in high performance bicycles, steel has been largely

replaced by aluminum and some titanium. The main factor driving this

change is interest by cycling enthusiasts in lighter bicycles.

Properties of Metals

Please understand that there is no simple statement that can be made

that characterizes the use of different metals for bicycles. What is true

is how the metal chosen is applied is much more important than the

material alone. One must look at the way the bike is designed, tested,

manufactured, supported along with the characteristics of the metal

rather than seeking a simplistic answer.

Metals vary widely in their resistance to corrosion. Steel must be protected

or rust will attack it. Aluminum and Titanium quickly develop an oxide

film that protects the metal from further corrosion. Both are therefore

quite resistant to corrosion. Aluminum is not perfectly corrosion resistant,

and particular care must be used where it contacts other metals and

galvanic corrosion can occur.

Metals are comparatively ductile. Ductile means bending, buckling and

stretching before breaking. Generally speaking, of the common bicycle

frame building materials steel is the most ductile, titanium less ductile,

followed by aluminum.

Metals vary in density. Density is weight per unit of material. 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

Metals are subject to fatigue. With enough cycles of use, at high enough

loads, metals will eventually develop cracks that lead to failure. It is very

important that you read The basics of metal fatigue below.

Let’s say you hit a curb, ditch, rock, car, another cyclist or other object.

At any speed above a fast walk, your body will continue to move forward,

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

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Cervelo Multi-speed racing bicycles Seite 33

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