Ok, I'm not sure who updates "THE DOC" (all caps, because it is in revered status), but, please help me add the following:
To change wheel sizes on the trip computer, you don't have to cut any wires.
1. Pull headlight/numberplate forward.
2. Ensure you have a backup battery.
3. Disconnect the power/ground/ground wire from the computer.
4. Get into the setup function of your computer.
5. Cycle through your settings until you get to "WS". If it isn't there, you didn't disconnect the right wire.
6. The Wheel Size is in MM, the formula is Pi X D.
7. Measure Tire Height across the center and multiply by 3.14. (much easier if measured in MM).
8. Use up/down buttons to set new wheel size (or adjust if your previous calibration was in error).
9. Plug in bike power to computer.
10. Re attach headlight/numberplate.
11. RIDE!