An apparatus for monitoring deflection of a tire including a non-transitory memory, storing tire behavior information which relates tire deflection to tire load and tire pressure; and a controller in communication with the memory. The controller is configured to: receive load information which relates to a load on the tire; receive pressure information which relates to a pressure of the tire; and determine a deflection of the tire based on the received load information, the received pressure information, and the stored tire behavior information.