This spreadsheet/tool is based on a formula by Antonio Angulo Alvarez, that appeared
in the November issue of EAA Experimenter. It precisely locates the center of gravity 
of a wheeled vehicle. 

The data needed to locate the C/G of a bike are:

1) Total weight of bike and rider. For this measurement the rider can just pick up the bike and 
step on the scale with it.

2) Wheelbase measured in whatever units you prefer.

3) Radius of rear wheel measured using same units as #2.

4) Radius of front wheel measured using same units as #2.

5) Weight of front wheel on scale with rider seated in position and bike level. To achieve
level, the rear wheel should be on a block the same height as the scale.

6) Weight of front wheel on scale with rider seated in position and rear wheel up on an
additional block. Block height above level should be equal to or greater than 10% of wheelbase.

7) Height of additional block used in #6. Use same units as #2.