Height (26x11x14)

The first number in a tire size represents the nominal height of the sidewall of a tire (usually in inches) from ground to top of tread. 

Width (26x11x14)

The width indicates the width of the tire's cross-sectional profile.

Rim Size (26x11x14)

This number is the diameter of the rim on which the tire will fit. The number is expressed in inches.