LIST OF MATERIALS NEEDED
 

• A bicycle computer.
• 10 feet of AWG #14 or #16   wire
• A 5" long x 3/4" wide metal sheet
• 1 dozen 8" plastic straps
• 2" of metal wire
• One 8-32 x 1/2" screw with bolt
• Electrical tape

 I purchased a Specialized Speedzone Sport Cyclocomputer for $20 USD. If you do not wish to use this same model, you can purchase a bicycle computer from any bicycle shop or Wal-mart. They range from $20 - $30 USD and they are all very similar. The Specialized brand can record speeds up to 70 mph (122 Km/hr) as well as trip distance, odometer, stopwatch and time. It is also water resistant. I decided to install the computer on the front axle of the car since it had more places to strap all the sensors. The steps to install it are the following:

STEP 1. Strap the computer in the center of the middle horizontal bar of the Odyssey

STEP 2. Run the sensor cable along the frame of the car. Place the plastic straps every 3" to 4" to keep the cable tight.

Continue to run the cable towards the left front hub (or the right front hub if you choose to). Eventually, the cable will run short since it was built for a bicycle. Cut the computer cable, add the necessary length of AWG wire to reach the hub, and protect the cable unions with electrical tape. NOTE: Be aware that the computer cable has one very thin black cable wire running in between the copper wires. This will force you to use two AWG wires to reach the sensor.

STEP 3. At this time you should prepare the holding tool for the sensor. Take the 5" x 3/4" metal sheet. If you do not have such a piece around your house, use the metal sheet that comes off from one of the communication ports at the back of your computer. This is the metal sheet that comes off when you installed your modem. This is exactly what I used and it worked perfect.

Here is the diagram provided by the manufacturer showing how to install it for a bicycle.

    You can accomplish this same configuration by taking the metal sheet and bending it the proper way. I came out with the following diagram for holding the sensor. NOTE: The total height of the sensor holder must not exceed 2". Else, it would make contact with the tire rim

Take this holding tool, fit it on the flat arm of the steering knuckle, and attach the sensor to it. Place the 8-32 x 1/2" screw through the holes indicated in the diagram. Start to tight the nut on the screw and you will notice how the holding tool gets stiff to provide the stable hold we need.

Attach the sensor to the holding tool with the plastic straps provided by the manufacturer and continue the wiring process.

 







STEP 4. Now we need to fit the magnet on the hub. Cut 1 1/2" to 2" of metal wire. If you do not have thin wire in your home, use an office clip (the large size). Bend the wire similar to this shape.

The front hub of the Odyssey has 3 screws on it. Take the nut off from the back of one of these screws, attach the wire, and tighten back the nut. Then, tighten the magnet at the other extreme of the wire.

STEP 5. Align the magnet with the sensor by bending one or the other and test. Spin the wheel and if the computer starts showing the speed, you have set it correctly.

STEP 6. The last step is to program the computer for the correct circumference of your wheel. Follow the manufacturer's instructions on how to measure the circumference. Mine worked out to be 1553 mm.
 

And that is it. I hope this will encourage you to install one since all of you probably want to know how fast you are riding. This is a fairly cheap, simple, and accurate method to achieve this.  Enjoy.