WHEELS, RIMS AND TIRESGENERALThe information herein covers wheels and hubsfor medium and heavy duty vehicles. Various types ofwheels (cast spoke or disc) are available and vary insize, types and materials (steel or aluminum).Figure 2. - Disc Front WheelTwo different configurations of drum mountings will alsobe found:1.Inboard mounted drum will be secured to hub onbrake group side of hub (Figure 3). Inboardmounted drums can be used with cast or discwheels.Figure 3. - Inboard Mounted Drum2.Outboard mounted drum is secured between thewheel and hub (Figure 4). Outboard mounteddrums will be used only with disc wheels.Figure 4. - Outboard Mounted DrumThe upper view of Figure 5 illustrates another version ofan inboard mounted drum. This installation has asecond flange inboard of the wheel mounting flange.The lower view illustrates a typical rear axle withoutboard mounted brake drum.All cast spoke wheels (front and rear) will have inboardmounted drums.CTS-4148APage 3
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