Bedienungsanleitung Trek 2012 (Seite 68 von 77) (Englisch)

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65 TREK ASSEMBLY MANUAL 27 April 2012

Supporting Information

Torque Specications

Torque is a measurement of the tightness of a threaded fastener such as a screw or

bolt, determined by using a torque wrench. The torque specications in this manual

are listed to help you determine the correct tightness of parts and their threaded

fasteners.

The torque specications should be used to make sure you do not over-tighten

a fastener. Applying more than the recommended torque to a fastener does not

provide extra holding power, and may actually lead to damage or breakage of a part.

However, leaving a part with less than the correct torque also leads to problems;

looseness can lead to fatigue failure. To prevent these problems, use a torque

wrench and use it correctly.

Read the Warning about Mechanical Work before performing any mechanical work

on your bicycle.

Always perform the simple function tests listed in this manual to make sure a part is

properly tightened, whether or not the part was tightened with a torque wrench. If the

part does not pass inspection at the recommended torque, take the bicycle to your

dealer.

This manual includes a comprehensive listing of torque specications. However, in

some cases torque specications change; always check for updates to the manual.

Slight dierences in a similar part may require a dierent torque, so in most cases

we oer a range of torque. In some cases we provide several methods of checking

the torque. The preferable method is always the one with the most precision. The

method with the most precision is almost always to use a torque wrench.

Determining torque by part

Many of the parts on Trek bicycles have the torque specication printed on or near

the part. The torque printed on the part is always the best, most accurate source. If

you cannot nd the specication on the part, check the torque specications page.

If you still cannot nd the correct specication, consult your dealer. Be aware that

some torque specications vary according to the material that is being clamped,

e.g. a seatpost binder bolt for a carbon seatpost might require a dierent amount of

torque than a binder bolt for an aluminum seatpost. Read the torque specications

carefully.

Determining torque by bolt size

Some people refer to a bolt by its wrench size. Although this is convenient for the

user, it is not as accurate as referring to bolt size (Figure 108) because bolt size can

be used to determine torque. The bolt-size method requires that you remove the

bolt to determine its size. Bolt size is denoted by an upper-case ‘M’ followed by the

diameter in millimeters; a 5mm bolt is referred to as M5.

• M7 bolts: Tighten to 160-180 lb•in (18.0-20.3 Nm)

• M6 bolts: Tighten to 100-120 lb•in (11.3-13.6 Nm)

• M5 bolts: Tighten to 40-60 lb•in (4.5-6.8 Nm)

WARNING—Too much torque can cause damage or the failure of a part. Too

little torque can cause the part to come loose or break from fatigue failure.

Use a torque wrench to correctly tighten a part.

Figure 108. Bolt sizes

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