Generac Power Systems MLTS Owner's Manual page 78

Temperature A
All passenger car tires must conform to federal safety
requirements 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
(1.5) times as well on the government course as a tire
graded 100. The relative performance of tires depends
upon the actual conditions of their use, however, and
may depart significantly from the norm due to variations
in driving habits, service practices and differences in road
characteristics and climate.
Traction
The traction grades, from highest to lowest, are AA, A, B,
and C. Those 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.
NOTE: The traction grade assigned to this tire is based
on straight-ahead braking traction tests, and does not
include acceleration, cornering, hydroplaning, or peak
traction characteristics.
Temperature
The temperature grades are A (the highest), B, and C,
representing the tire's resistance to the generation of
heat and its ability to dissipate heat when tested under
controlled conditions on a specified indoor laboratory test
wheel. Sustained high temperature can cause the
material of the tire to degenerate and reduce tire life, and
excessive temperature can lead to sudden tire failure.
The grade C corresponds to a level of performance which
all passenger car tires must meet under the Federal
Motor Safety Standard No. 109. Grades B and A
represent higher levels of performance on the laboratory
test wheel than the minimum required by law.
NOTE: The temperature grade for this tire is established
for a tire that is properly inflated and not overloaded.
Excessive speed, under-inflation, or excessive loading,
either separately or in combination, can cause heat
buildup and possible tire failure.
Owner's Manual for Mobile Generator Sets
NHTSA Trailer Equipment Requirements
Additional Information on Light Truck Tires
Figure 7-2. Light Truck Tires
A The "LT" indicates the tire is for light trucks. An
"ST" is an indication the tire is for trailer use only.
B Load Range. This information identifies the tire's
load-carrying capabilities and its inflation limits.
C Maximum Load Dual. This information indicates
the maximum load and tire pressure when the tire
is used as a dual, that is, when four tires are put on
each rear axle (a total of six or more tires on the
vehicle).*
D The "M+S" or "M/S" indicates that the tire has
some mud and snow capability. Most radial tires
have these markings; hence, they have some mud
and snow capability.
E This information indicates the maximum load and
tire pressure when the tire is used as a single.*
* Maximum load is presented in kilograms and pounds
(kg/lbs). Maximum tire pressure is presented in kilo-
pascals and pounds per square inch (kPa/psi) for
when the tire is cold.
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