The resistance to unseating of at least one tire mounted on a mounting rim and inflated to a predetermined pressure is determined by mounting the tirerim unit on a vehicle in a steering axle position. An application server receives information pertaining to a call to a first user placed by a second user. Arrangements may be responsive to various metrics, including the position of conferees in a room and dominant conferees in the videoconference. The centrifugal fan wheels have angled blades that draws in air from a lateral air inlet located on the shell. As a result, an image which has a sufficiently large area factor even with a small amount of ink droplets and is excellent in image density, bleeding resistance, and fixability can be obtained.