V.  Installation

    1.  Install the computer bracket on the handlebars and insert the computer by pushing it forward into the bracket.

    2.  With electrical tape mount the sensor on the upper inside of the forks. Use the same side of the bicycle as was used  to designate the zero spoke in rim marking. The foam backing may be discarded as it tends to squirm later.

    3.  Mount a magnet on spoke 20 of a 36-spoke wheel or 18 of a 32-spoke wheel. (Spoke numbers increase in the forward direction of rotation.)

    4.  Adjust the sensor - magnet clearance to about 1mm. The Protege magnet is nonadjustable for this clearance and to achieve this it may be necessary to move the magnet and the sensor downwards to a point where the spokes come closer to the forks. I prefer the much lighter Sigma Sport magnet that can be instantly snapped onto the spoke and easily twisted to adjust clearance very accurately. (This magnet is available from Nashbar for $0.99.) The only downside to the design is that by rough manhandling of the wheel the magnet can be knocked out of alignment. Use of  the metal sleeve provided with the magnet protects the alignment slightly, but I usually do not use it. The sleeve slightly reduces the response of the sensor. Note that clearance is not critical as both magnets will operate up to a clearance of 8 mm.

    5. Adjust the alignment of the magnet with the sensor. The center of the Protege magnet has to be aligned with one of the two circles marked on the sensor. The Sigma Sport magnet has to be centered on the sensor with each end of the magnet aligned with the center of a circle. Neither alignment is critical since both magnets will continue to operate up to 5 mm from these positions.

    6. With mountain bicycles, mount the sensor low down on the forks on the opposite side to that of the zero spoke. Put the magnet on spoke 21 of a 36-spoke wheel.

    7.  Test the installation as follows. Roll the wheel to a ground reading of about 0.9 rev on the rim and zero the trip display by pushing the meter forward in its bracket for about three seconds. Roll the wheel forward for over a revolution until the trip distance increments by one. This should occur precisely at a rim reading of 0.00 rev. If this reading is off by a few hundredths of a revolution, correct by moving the sensor forward or backward on the forks. Note that the closeness of synchronization of the rim zero with that of the meter does not affect the accuracy of reading fractions of a revolution.