A system and method for collecting and processing tire tread depth data from a plurality of tires is provided. A sensor measures the tread depth of one of the tires and produces a tread depth signal representing the tire tread depth. The tread depth signal is transmitted over a communications medium from the sensor to the serial port of a computer. The computer includes a database or spread sheet for storing an entry associating a respective tire tread depth with each tire. The computer displays a graphic representing each of the tires. The graphic includes a representation of the bottom of a truck on which the tires are installed. The graphic has a respective region representing each of the tires. A region of the graphic is selected. The selected region of the graphic is linked to a corresponding one of the plurality of data representing tire tread depth in the database or spreadsheet. When the tread depth signal is transmitted over the communications medium, the computer changes the corresponding one of the plurality of data in the database or spreadsheet, in response to the tread depth signal. The color of each region is varied, based on the respective tread depth stored in the database or spreadsheet for each respective tire.