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Trek 2012 Manual

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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
… 68 …


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