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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
compo nent 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 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 materials. 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
What to look for (continued):
• SOME CRACKS (particularly larger ones)
MAY MAKE CREAKING NOISE AS YOU
RIDE.
Think about such a noise as a serious warning
signal. Note that a well-maintained bicycle will
be very quiet and free of creaks and squeaks.
SIMPLE RULE 5 :
Investigate and nd
the source of any
noise. It may not a be
a crack, but whatever
is causing the noise
should be xed
promptly.
In most cases a fatigue crack is not a defect. It is a sign that the part has
been worn out, a sign the part has reached the end of its useful life. When
your car tires wear down to the point that the tread bars are contacting the
road, those tires are not defective. Those tires are worn out and the tread
bar says “time for replacement.” When a metal part shows a fatigue crack, it
is worn out. The crack says “time for replacement.”
Fatigue Is Not A Perfectly Predictable Science
Fatigue is not a perfectly predictable science, but here are some general
factors to help you and your dealer determine how often your bicycle should
be inspected. The more you t the “shorten product life” prole, the more
frequent your need to inspect. The more you t the “lengthen product life”
prole, the less frequent your need to inspect.
Factors that shorten product life:
Hard, harsh riding style
“Hits”, crashes, jumps, other “shots” to the bike
High mileage
Higher body weight
Stronger, more t, more aggressive rider
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