253
(Continued)
DEPARTMENT OF
TRANSPORTATION
UNIFORM TIRE QUALITY
GRADES
The following tire grading categories
were established by the National
Highway Traffic Safety Administra
-
tion. The specific grade rating
assigned by the tire's manufacturer in
each category is shown on the side
-
wall of the tires on your vehicle.
All passenger vehicle tires must
conform to Federal safety require
-
ments in addition to these 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
times as well on the government
course as a tire graded 100. The rela
-
tive performance of tires depends
upon the actual conditions of their
use, however, and may depart signifi
-
cantly from the norm due to variations
in driving habits, service practices,
and differences in road characteristics
and climate.
Traction Grades
The Traction grades, from highest to
lowest, are AA, A, B, and C. These
grades represent the tire's ability to
stop on wet pavement, as measured
under controlled conditions on speci
-
fied government test surfaces of
asphalt and concrete. A tire marked C
may have poor traction performance.
CAUTION!
To avoid damage to your vehicle or tires,
observe the following precautions:
Because of restricted traction device
clearance between tires and other
suspension components, it is important
that only traction devices in good condi
-
tion are used. Broken devices can cause
serious damage. Stop the vehicle imme
-
diately if noise occurs that could indi
-
cate device breakage. Remove the
damaged parts of the device before
further use.
Install device as tightly as possible and
then retighten after driving about ½ mile
(0.8 km).
Do not exceed 30 mph (48 km/h).
Drive cautiously and avoid severe turns
and large bumps, especially with a
loaded vehicle.
Do not drive for a prolonged period on
dry pavement.
Observe the traction device manufacturer’s
instructions on the method of installation,
operating speed, and conditions for use.
Always use the suggested operating speed
of the device manufacturer’s if it is less
than 30 mph (48 km/h).
Do not use traction devices on a compact
spare tire.
CAUTION! (Continued)
2019_RAM_2500_3500_UG_USA=GUID-8BBFE451-BF24-4E82-808A-AE2460D39A05=1=en=.book Page 253
Summary of Contents for 2500 2019
Page 1: ...2019 USER GUIDE RAM 2500 3500...
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