Manual Trek 2012 (page 72 of 77) (English)

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69 TREK ASSEMBLY MANUAL 27 April 2012

Supporting Information

Carbon Fiber Parts Compatibility

Carbon ber composite can be damaged by sharp edges or clamping mechanisms

which cause a point load, or a high pressure area. Before installing any carbon

ber part, or attaching any component to an existing carbon ber part, follow these

procedures to make sure the parts or components are carbon-compatible.

If the part is used, also make sure the part is in good condition by following the

carbon ber composite inspection procedures.

These procedures apply to any part interfacing a carbon part. As an example, a

carbon handlebar interfaces the stem, brake levers, shift levers, and possibly bar-

ends. All of the clamps of these parts should be inspected for carbon compatibility. If

any part fails the inspection, either x the problem or replace the part.

For a carbon ber mountain-style handlebar, do not cut the handlebar. The bar has

an internal carbon reinforcement for supporting bar-end clamps. Reducing handlebar

length removes this reinforcement.

Clamp style inspection

Make sure the clamp is carbon-friendly (Figure 102). The clamp must draw together

smoothly, and not pinch. The clamp bolt must be perpendicular to the radius of

the clamped item, and should be as close to the surface of the clamped item as

possible.

For handlebars, do not attach bar-ends that use an internal (expanding) clamp

mechanism.

Surface inspection of clamping parts

Visually inspect the edges and surfaces of the interfacing parts for burrs or

deformation that might mar the carbon part.

With your nger, again check the part. Any roughness or sharp edges could mar the

carbon part.

Clamping surfaces must be clean

With some interfaces of metal parts, grease is used on the clamping surfaces to

prevent corrosion. If grease is applied to a carbon part, the part may slip in the

clamp, even at the recommended torque specication. Since carbon does not

corrode, grease is not necessary, nor recommended.

Before assembling a carbon part, clean both the part and its mating surface with

rubbing alcohol and a shop rag; clean until the rag shows no discoloration.

Also see Carbon Fiber Parts Lubrication on page 71.

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Trek 2012 Manual

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