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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


 


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