This pie chart defaults to displaying time spent in each gear. Click one of the other buttons
below to update the chart to see one of several other interesting statistics. The pie slices
for % time are sorted by gear inches starting with the smallest gear (12 noon) and proceeding
clockwise. For all the other statistics (power, heartrate, cadence), the slices are sorted
based on the size of the slice starting with the smallest at 12 noon and proceeding clockwise.
Similarly, the legend on the right is sorted from top to bottom in the same order as the slices.
Colors vary from pie chart to pie chart although I'm working on updating the code to keep the
colors consistent based on the original %time chart. I will update this note once that is working.