Bedienungsanleitung Trek 2012 (Seite 61 von 77) (Englisch)

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58 TREK ASSEMBLY MANUAL 27 April 2012

Supporting Information

Alignment Inspection

These instructions detail how to check frame alignment in your shop. Checking

alignment is not dicult, but doing it right takes some time and care.

Tools required

These steps require a variety of tools, depending on what you are checking.

• Work stand

• Dished rear wheel

• String (preferably monolament)

• Calipers or steel ruler

• Park Frame Alignment Gauge (F.A.G.-1)

Ideally, the frame would be bare of components. The illustrations show a bare frame.

But we understand this is not always practical. Just make sure no parts interfere with

your measurements.

To check midline displacement with string

This method works on almost any bike, regardless of frame size or type. Start with

the bike in a repair stand, and a wheel in the frame.

1. Run a string around the head tube and through the rear dropouts. The string

should go to the inside of the dropouts (Figure 100): where the hub attaches. Make

sure that nothing interferes with the string (Figure 98). The string should not touch

any component like a cable housing, and should not be placed over a head badge,

frame weld, or the butted portion of a tube.

2. Put tension on the string.

3. Measure the distance from the seat tube to the string (Figure 101). Measure

perpendicular to the frame centerline, on the plane of the bottom bracket axle. One

way to make sure you are on the correct plane is to align the measuring tool so

that you measure the shortest possible distance.

4. Measure the other side.

5. If the frame is more than 2.0mm out of alignment. Call Customer Service.

Note: Frame alignment is not the same as actual measurement. See Compare the Specifications

on the previous page.

To check midline displacement with a frame alignment gauge

This method does not work on some full suspension frames where the wheelbase is

too long, there is no seat tube, or the swingarm or other frame component interferes

with the gauge. Also note that it measures to the outside of the dropout. Any

thickness variance between the measured surface and the inside dropout face must

be compensated. Start with the bike in a repair stand, and a wheel in the frame.

1. Place the frame alignment gauge squarely against the head tube and seat tube

(Figure 103). Make sure that nothing interferes with the gauge. The gauge should

not touch any component like a cable housing, and should not be placed over a

head badge, frame weld, or the butted portion of a tube.

2. By turning the set screw, set the gauge so that it lightly touches the dropout.

3. Measure the other side.

4. If the two sides are different, reset the gauge so that it touches the frame on only

one side of the frame.

Figure 100. String is tight through the inside of the rear

dropouts

Figure 101. Do not place string over a frame weld, head

badge, or butted portion of a tube

Figure 102. Measure from the string to the frame on both sides

Figure 103. Measuring with a Frame Alignment Gauge

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