FORD 2004 Mustang v.3 - Manual (Page 209)

the tire meets all federal standards. The next two
numbers or letters are the plant code where it was
manufactured, the next two are the tire size code
and the last four numbers represent the week and
year the tire was built. For example, the numbers
317 mean the 31st week of 1997. After 2000 the
numbers go to four digits. For example, 2501 means
the 25th week of 2001. The numbers in between are
identification codes used for traceability. This
information is used to contact customers if a tire
defect requires a recall.
9. M+S or M/S: Mud and Snow. or
AT: All Terrain. or
AS: All Season.
10. Tire Ply Composition and Material Used:
Indicates the number of plies or the number of
layers of rubber-coated fabric in the tire tread and
sidewall. Tire manufacturers also must indicate the
ply materials in the tire and the sidewall, which
include steel, nylon, polyester, and others.
11. Maximum Load: Indicates the maximum load in
kilograms and pounds that can be carried by the
tire. Refer to the tire label or the safety certification
label, located on the B-Pillar or the driver’s door, for
the correct tire pressure for your vehicle
12. Treadwear, Traction and Temperature
Grades
• Treadwear: The treadwear grade is a
comparative rating based on the wear rate of the
tire when tested under controlled conditions on a
specified government test course. For example, a
tire graded 150 would wear one and one-half
(1
1 ⁄
2
) times as well on the government course as a
tire graded 100.
• Traction: The traction grades, from highest to
lowest are AA, A, B, and C. The grades represent
the tire’s ability to stop on wet pavement as
measured under controlled conditions on specified
government test surfaces of asphalt and concrete.
A tire marked C may have poor traction
performance.
2004 04- Mustang (mus)
Owners Guide (post-2002-fmt)
USA English (fus)
Maintenance and Specifications
209