The Unit - Sigma Sport BC1400 Cycle Computer

The Computer Location - Left Side of Gauge Cluster

I chose this location as it was the only place with a visible mounting bolt. I fabricated a simple aluminum mounting bracket to attach the mounting plate that came with the Sigma Sport to.

The Wiring Route -

Simply dropped the wire down behind the headlight unit. Following the brake line, I tie-wrapped it to the brake line (loosely) to allow movement with the suspension. The sensor wire continues down on the outside of the left fender to the final sensor location (see next section).

The Pickup Sensor Location - Inside Front Left Lower Fork

The sensor was simply tie-wrapped to the inside of the left fork making sure that it lines up with the magnet when the front wheel rotates. The clearance is only about 2-3mm between the magnet and the pickup sensor

The Magnet Location - Outside of Left Front Rotor

The Magnet used is a Rare Earth Magnet that I picked up from Lee Valley Tools for $0.69. They have different sizes, but I picked up a 0.375"x0.10" size magnet and it seemed to do the trick. The reason a Rare Earth Magnet is used is because of there extremely strong adhering properties to metals. However, I still used a crazy glue to secure the magnet to the rotor, as the position it was best located was aluminum, which is not a magnetic metal. The storn magnetic properties are still important though, as it will send the signal to the pickup sensor more easily/accurately. The rotational force of the bike at speed has caused the magnet to come off the rotor in the past. The times that it has come off, I ended up finding the magnet later attached to my fork tube. (This should prove how strong the magent really is. Too fly off at 100+ km/hr and still manage to attach to the fork tube is pretty impressive.) That's besides the point though, my best guess for why the magnet has come off a few times is probably because of the heat generated on the rotor over heavy usage and hot weather.