III. Computer Programming

1. Complete reset

1. Select "ODO" or "AVE" on fourth line of computer by pressing mode button.

2. Hold set button using a hairpin or large paper clip for 4 seconds.

3. Use mode button to select KM/H between KM/H and M/H. Press set button.

4. First digit of wheel circumference 1 will be flashing and change to 9 by pressing mode button. Press set button.

5. Repeat 4 until all four digits of circumference have been set to 9.

6. First digit of odometer for circumference 1 will be flashing, and all digits are changed to 0 or desired values as for the circumference above. (Confusingly this screen is labeled "ODO" whereas on the normal screen it is labeled "BIKE ODO".)

7. First digit of circumference 2 will be flashing. Repeat 4 to 6.

8. First (hour) digit of clock will be flashing. Set time to complete programming.

 

2.  Reset of clock only

1.  Select clock on fourth line.

2.  Hold set button using a hairpin or large paper clip for 4 seconds.

3.  First (hour) digit of clock will be flashing. Set time as above.

 

3. Instant conversion to normal bicycle computer mode

     It is very useful to have both circumferences to set to 9999 mm as above because it allows the measurer to freeze primary measurement while he makes secondary measurements (eg overshoot correction).

     However the second circumference can be set with the real value in mm so that if this is selected by pressing the circumference switch, conversion to normal metric computer mode can be made instantly. The mm value can be derived from the calibration data by dividing the course length in mm by the revolutions found.  For instance I typically get 191.21 rev over a 400-meter calibration course for tire of 700 x 23 and this corresponds to a circumference setting of 400 x 1000 mm /191.21rev = 2092 mm/rev.

     The best way to convert to normal mile mode is not as obvious. One can go through a complete reset and select M/H, but this is very tedious as it means operating the awkward rubber set button many times. Also one as to go through this all over again on conversion back to KM/H. A slightly better way is to set the computer aside for five minutes immediately after selecting M/H until it goes into sleep mode. One can then start using it in mile mode. The best way though is to calibrate circumference 2 in millionths of a mile. Then one can switch back and forth between revolution counter mode and normal mile mode by simply pressing the circumference button. With the tire mentioned above one has to set circumference 2 to 400 m x 1,000,000/(1609.344 m per ml x 191.21 rev) = 1300 millionths of mile/rev. The minor disadvantage is that although the computer will then operate in mile mode, the screen displays km/h.