Trek 11i EN - Manual (Page 12)

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and magnet by spinning the wheel and noting if the computer is
displaying speed.
If the computer shows current speed, the sensor is
reading the magnet.
If the computer is not displaying a value, realign the
sensor and magnet until one is displayed.
5. Tighten the nylon ties and trim the excess
length (Figure 11).
Installation
Figure - Trim excess nylon tie
length