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tradeoff: the wonderful, lightweight performance we want requires that we inspect the structure.
What to look for
• ONCE A CRACKS STARTS IT CAN GROW AND GROW FAST. Think
about the crack as forming a path- way to failure. This means that any crack
is potentially dangerous and will only become more dangerous.
SIMPLE RULE 1 : If you find crack, replace the
part.
• CORROSSION SPEEDS DAMAGE. Cracks grow more quickly when they
are in a corrosive environment. Think about the corrosive solution as further
weakening and extending the crack.
SIMPLE RULE 2 : Cleanyour bike, lubricate your
bike, protect your bike from salt, remove any salt
as soon as you can.
• STAINS AND DISCOLORATION CAN OCCUR NEAR A CRACK. Such
staining may be a warning sign that a crack exists.
SIMPLE RULE 3 : Inspect and investigate any
staining to see if it is associated with a crack.
• SIGNIFICANT SCRATCHES, GOUGES, DENTS OR SCORING CREATE
STARTING POINTS FORCRACKS. Think about the cut surface as a focal
point for stress (in fact engineers call such areas “stress ris- ers,” areas
where the stress is increased). Perhaps you have seen glass cut? Recall
how the glass was scored and then broke on the scored line.
SIMPLE RULE 4 : Do not scratch, gouge or score
any surface. If you do, pay fre- quent attention to
this area or replace the part.
• 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 : Investi- gate and find the
source of any noise. It may not a be a crack, but
whatever is caus- ing the noise should be fixed
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 fit the “shorten product
life” profile, the more frequent your need to inspect. The more you fit the “lengthen product life” profile, the less frequent your
need to inspect.
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