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force loads include crashes, but you don't have to crash to put a high
force load on your bicycle. For example, hitting a large hole in the
road or a sharp bump such as a railroad track can put large forces on
your bicycle.
The manner in which you ride will determine whether your bicycle
and its parts will last. If you ride hard or aggressively, you should
replace the bicycle and/or its parts more often than riders who ride
smoothly or cautiously. When evaluating your use of the bike or
part, there are many variables: weight, speed, technique, terrain,
maintenance, riding environment (humidity, salinity, temperature,
etc.), and the frame or part itself—so it is impossible to give a precise
timetable for replacement. But as a rule, it is better to err on the safe
side and replace the bicycle or parts more frequently. If you aren't
sure, ask your dealer.
Carbon ber is among the strongest materials used in bicycle
manufacture. However, carbon ber has unique qualities, different
from metal parts, and must be inspected carefully for damage.
Unlike metal parts, carbon ber parts that have been damaged may
not bend, bulge, or deform; a damaged part may appear to be normal
to a cursory glance. Use the following procedures to inspect carbon
ber parts (These tests may not be conclusive):
• Check for scratches, gouges, or other surface problems.
• Check the part for loss of rigidity.
• Check the part for delamination.
• Listen for unusual creaking or clicking noises.
The tests are difcult to describe, so we provide a movie of