Tires; Tire Inflation Pressure When Cold; Uniform Tire Quality Grading; Dot Quality Grades - Maserati GranTurismo Coupe Owner's Manual

Tires

Tire inflation pressure when cold

The tire inflation values, indicated in
this manual, are intended for cold

tires.

The maximum speed that can
be reached with winter tires is
indicated by the tire
manufacturer. Always comply with
the local regulations.
When using the spare wheel
(emergency wheel) do not
exceed 50 mph (80 km/h).
Avoid driving at full throttle, braking
sharply and cornering at high speeds.

Uniform Tire Quality Grading

All passenger car tires must conform to
Federal Safety requirements in
addition to these grades.

DOT Quality Grades

Tires Tread wear
Michelin Pilot Sport 220

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
1
wear one and one-half (1 / ) times as
2
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.

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

Traction

Temperature
AA A
Traction
The traction grades, from highset 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.
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
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
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Tires 139