Types of Treads.

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Figure 32-11. Bias-Ply Tire Construction

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TM-9-8000 Principles of Automotive Vehicles Manual

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Figure 32-16. Regular Treads.

TM 9-8000

32-12. Types of Treads.

a. Mud and Snow(MS) Tread.

(1) Directional. The directional mud an( snow

tread (fig. 32-13) is of a V-design with large spaces

between the lugs. The spaces between the lugs are kept

free from snow because of tire rotation and flexing,

therefore improving traction. A directional tire may be

mounted on the rim only one way and will deliver traction

in one direction only. The point of the V-design must

contact the ground first when traction is required A

directional tread also may be called a traction

tread.

(2) Nondirectional. The nondirectional mud and

snow tread design (fig. 32-14) also has large spaces

Figure 32-14. Nondirectional Mud and Snow

between the lugs. The lugs are placed perpendicular to

Tread

the centerline of the tire This design provides good

traction in both

This tread design is used on tires for service on rough

directions.

terrain and is of the nondirectional type.

b. Cross-Country Tread. The cross-country tread

e. Earthmover Tread. This tread design (fig. 32-18)

(fig. 32-15) is the same as the mud and snow tread,

may be like either of those used on commercial-type

except that the cross-country tread has rounded

vehicles for off-road service, which are nondirectional or

shoulders.

similar to grader tires, which are directional.

c. Regular Tread. Regular tread (fig. 32-16

f. Traction Tread. Traction tread is similar to the V-

consists of small spaces between tread patterns This

design of the mud and snow directional tread. This

allows for a quiet ride and safe operation or wet and dry

design provides maximum traction in soft soil.

roads. This tread commonly is used on modern highway-

operated tires.

g. Desert Tread. Desert tread patterns generally

are wider than average to distribute the weight of the

d. Rock Service Tread. Rock service tread (fig. 32-17)

vehicle over a larger area. The tread pattern may be

is characterized by narrow voids between lugs so that

either directional or nondirec-

loose rock cannot be caught and tear the tread lugs

loose from the tire body

Figure 32-15. Cross-Country Tread

Figure 32-13. Directional Mud and Snow

Tread

TA233825

32-7