Tires: tire number question, ATV Tire Sizing

Question
I have an ATV.  the tire sizes are:
22 x 10 x 9
22 x 12 x7

Could you please explain what each of the numbers mean...
I know the 22 is the height of the tire, but what do the other numbers mean.

Answer
Ronald,

A 22 X 10 - 9 (notice how the size is officialy designated)

22 = Overall diameter in inches  

10 = Section width, the maximum width of the cross section of the tire (excluding any ornamention, curb ribs, sidewall protective ribs, etc.), which occurs in the mid sidewall area.

9 = Rim diameter in inches.