KKK-B-1579B
Rear springs shall be progressive or variable rate. Rear wheels shall be designed and so located
that they will not interfer with the use of tire chains (see 3.4.10.4).
3.4.9 Axles. Axle ratings shall be at least equal to the load imposed on each axle,
measured at the ground, when vehicle is loaded to specified GVW.
3.4.9.1 Positive-traction differential. When specified (see 6.2), rear axle with
positive-traction, limited-slip, or automatic locking differential shall be furnished.
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3.4.10 Wheels, rims, tires, and tubes. Vehicle shall be equipped with single front and
dual or tandem rear wheels. Rim size shall be the same for all wheels on the vehicle. Tire size
and ply rating shall be the same for all tires on the vehicle. Rim and tire ratings shall conform to
Tire and Rim Association recommendations for the type and size of tires furnished. When
specified (see 6.2), disc type wheels with not less than 8 studs shall be furnished.
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3.4.10.1 Tires. Unless otherwise specified (see 6.2), tires shall be tube or tubeless type
with highway tread. Steel belted radial, or when specified (see 6.2), bias ply tires shall be
furnished. Tires shall have a rated capacity at least equal to the load imposed on each tire,
measured at each wheel, at the ground, with the vehicle loaded to specified GVW. When
specified (see 6.2), for Civil Agencies only, non-directional tires with mud and snow tread shall
be furnished. Tires shall conform to Tire and Rim Association recommendations or to ZZ-T-381
with a size designation system the same as the Tire and Rim Association.
3.4.10.2 Balancing. Each tire shall balance within practicable limits. Wheels, hubs, and
brake drums shall be effectively in balance. Balancing shall be adequate to preclude wheel
shimmy at all vehicle speeds.
3.4.10.3 Inner tubes. When tube type tires are furnished, inner tubes shall be of
heavy-duty type and shall be of proper size for the tires furnished. Tire flaps shall be provided
for tube type tires in accordance with Tire and Rim Association recommendations.
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3.4.10.4 Tire chain clearance. There shall be no interference which will prevent use of
tire chains on at least the outside driving tires in accordance with SAE J683. Allowance for
spring deflection shall be included.
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3.4.10.5 Spare wheel assembly. Unless otherwise specified (see 6.2), a spare wheel or
rim shall be mounted on a carrier and installed in a readily accessible location. Spare wheel
assembly shall be so located as to not protrude beyond body. Threaded fasteners, when used to
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