day, and year of casting; the name of manufacturer, the name of its plant, and the serial number; the type of
wheel and the class; and the capacity of the car it can be used on. In figure 2.1, you see for type of wheel and
class AARCS-2, BR; these marks stand for cast-steel, two-wear, class B, rim-treated. Untreated wheels, class
U, are not marked for class. The tape size is paint-stenciled, shown in the figure as 165. A wheel circumference
tape, with sizes calibrated in increments of one inch, is used for measurements. Taping wheels is important to
insure that wheels mounted on the same axle have the same diameters.
b. Wheel markings for wrought-steel wheels are somewhat different for one- and multiple-wear wheels.
Markings for each are explained in the following subparagraphs and shown in figure 2.2.
Figure 2.2. Markings on Wrought-Steel Wheels.
(1) On one-wear wheels the month and year the wheel is manufactured, the brand of the manufacturer,
the manufacturer's serial number, the heat number, and identification mark AAR-1-W