WHEELS, TIRES, AND TRACKS
Section I. WHEEL CENTER SECTION
32-1. Disk Wheels. The center disk of a wheel (fig. 32-
32-3. Wire Wheels. This type of wheel consists of a
1) may be a solid plate or of a slotted steel construction.
pressed-steel hub and rim connected by welded spokes
In both cases, the disk is welded or riveted to the rim,
(fig. 32-3). This design allows greater amounts of air to
and the wheels are demountable at the hub. The disk is
flow past the brake assemblies, therefore keeping them
dished to bring the point of ground contact under the
cool and minimizing brake fade. Wire wheels, however,
large wheel bearing, and to permit the mounting of dual
are hard to clean, require the use of full-circle antiskid
wheels. Modern passenger cars almost exclusively use
chains only, and are not adapted for use with dual
the steel-disk type wheel.
32-2. Pressed and Cast Spoked Wheels. On light
vehicles, the wheel center section and rim are connected
by spokes and the wheels are demountable at the hub.
For heavier trucks, the spokes are integrated with the
center section and a demountable rim is used. Another
form of cast wheel (fig. 32-2), sometimes called a mag
wheel, is a one-piece design made of lightweight alloys.
These types of wheels are very popular on modern
automobiles and are made in many sizes and styles.
Great care must be taken when mounting and
demounting tires on these rims, because the wheel
assemblies are soft and brittle, which causes them to
Figure 32-2 Cast Aluminum Wheel
Figure 32-1. Disk Wheel
Figure 32-3. Wire Wheel