| Housing for the differential pinion gears side gears. Mounting point for ring gear. | |
| The relationship between the height of the tire from bead to tread, and the tread width, usually expressed as a percentage of the trade width. | |
| A cylindrical hole. | |
| Friction material it is bonded or riveted to curved metal structures attached to the backing plate. The brake shoes press on the brake drums to stop its rotation. |