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What should you expect from your carbon frame? It depends on many complex factors. But we can tell you that if the impact is hard
enough, the fork or frame may be completely broken. Note the significant difference in behavior between carbon and metal. See
Section 2. A, Understanding metals in this Appendix. Even if the carbon frame was twice as strong as a metal frame, once the carbon
frame is overloaded it will not bend, it will break completely.
Inspection of Composite Frame, Fork, and Components
Cracks:
Inspect for cracks, broken, or splintered areas. Any crack is serious. Do not ride any bicycle or component that has a crack of any
size. Delamination:
Delamination is serious damage. Composites are made from layers of fabric. Delamination means that the layers of fabric are no
longer bonded together. Do not ride any bicycle or component that has any delamination. These are some delamination clues:
1. • A cloudy or white area. This kind of area looks different from the ordinary undamaged areas. Undamaged areas will look glassy,
shiny, or “deep,” as if one was looking into a clear liquid. Delaminated areas will look opaque and cloudy.
2. • Bulging or deformed shape. If delamination occurs, the surface shape may change. The surface may have a bump, a bulge, soft
spot, or not be smooth and fair.
3. • A difference in sound when tapping the surface. If you gently tap the surface of an undamaged composite you will hear a consistent
sound, usually a hard, sharp sound. If you then tap a delaminated area, you will hear a different sound, usually duller, less sharp.
Unusual Noises:
Either a crack or delamination can cause creaking noises while riding. Think about such a noise as a serious warning signal. A well
maintained bicycle will be very quiet and free of creaks and squeaks. Investigate and find the source of any noise. It may not be a
crack or delamination, but whatever is causing the noise must be fixed or replaced before riding.
WARNING: Do not ride a bicycle or component with any delamination or crack. Riding a delaminated or cracked frame,
fork or other component could lead to complete failure, with risk of serious injury or death.
C. Understanding components
It is often necessary to remove and disassemble components in order to properly and carefully inspect them. This is a job for a
professional bicycle mechanic with the special tools, skills and experience to inspect and service today’s high-tech high-performance
bicycles and their components.
Aftermarket “Super Light” components
Think carefully about your rider profile as outlined above. The more you fit the “shorten product life” profile, the more you must
question the use of super light components. The more you fit the “lengthen product life” profile, the more likely it is that lighter
components may be suitable for you. Discuss your needs and your profile very honestly with your dealer.
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