Section II. WHEEL RIMS

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WHEELS, TIRES, AND TRACKS

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TM-9-8000 Principles of Automotive Vehicles Manual

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Figure 32-6. Safety Rim

TM 9-8000

Section II. WHEEL RIMS

holding the tire in place. This type of rim is standard

32-4. Drop Center. The drop center rim (fig. 32-4) is

equipment on 3/4-ton 4 x 4 trucks.

made . n one piece and is fastened to the wheel

permanently. Its important feature is a well that permits

32-6. Safety. Safety rims (fig. 32-6) are similar to drop

the mounting and demounting of tires. Bead seats are

tapered to match a corresponding taper on the beads of

center rims. The major difference is that safety rims

the tire. Drop center rims are used generally on smaller

have a slight hump at the edge of the bead ledge that

vehicles, such as 114-ton 4 x 4 trucks.

holds the bead in place when the tires go flat. These

rims currently are used on many passenger cars and

light trucks.

32-5. Semidrop Center. The semidrop center rim (fig.

32-5) is also fastened permanently to the wheel. This rim

has a shallow-well, tapered-head seat to fit the taper of

32-7. Split. A split rim (fig. 32-7) is a rim that has a

the beads of the tire. It also has a demountable flange or

removable bead seat on one side of the rim. The seat is

side ring, which fits into a gutter on the outside edge of

split to allow for its removal so tires can be changed.

the rim,

Some bead seats also require the use of a lockring to

retain the seat. These rims are found usually on large

vehicles.

Figure 32-4. Drop Center Rim

Figure 32-5. Semidrop Center Rim.

32-2