Ford Probe (1997 year). Manual — part 51
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Tire Inspection and Maintenance
Inspect the tire treads, and remove stones, nails,
glass or other objects that may be wedged in the
tread grooves. Check for holes or cuts that may
permit air to leak from the tire, and make the
necessary repairs.
Inspect the tire sidewalls for cuts, bruises and
other damage. If you suspect internal damage to
the tire, have it removed and checked. You may
need to repair or replace it.
Tire Rotation
Because your vehicle’s front and rear tires
perform different jobs, they often wear
differently. To make sure your tires wear evenly
and last longer, rotate them as indicated in the
following diagram.
Do not include the spare tire as part of your
rotation.
For tire rotation intervals, see the
Maintenance
Schedule
booklet. If you notice the tires wearing
unevenly, have them checked.
Rotating the tires
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Replacing the Tires
We recommend that you use the same size and
type when making tire replacements. The
standard model uses P195/65 R14 tires, and the
GT model is equipped with P225/50VR16 tires.
If your standard model vehicle is equipped with
a 3-spoke aluminum wheel, you will need
P205/55H R15 tires.
Replace any tires that show wear bands. When
your tire shows a wear band, it has only 1/16
inch (2 mm) of tread left.
A worn-out tire
Because your vehicle’s tires may wear unevenly,
you may need to replace them before a wear
band appears across the entire tread.
R
WARNING
When replacing full size tires, never mix
radial, bias-belted, or bias-type tires. Use
only the tire sizes that are listed on the
tire pressure decal. Make sure that all tires
are the same size, speed rating, and
load-carrying capacity. Use only the tire
combinations recommended on the decal.
If you do not follow these precautions,
your vehicle may not drive properly and
safely.
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Tires that are larger or smaller than your
vehicle’s original tires may also affect the
accuracy of your speedometer.
Wheel and Tire Matching
See an authorized tire dealer for proper
servicing procedures. Wheels and tires must be
properly removed, matched and remounted to
maintain the best possible ride.
Information About Tire Quality Grades
New vehicles are fitted with tires that have their
Tire Quality Grade (described below) molded
into the tire’s sidewall. These Tire Quality
Grades are determined by standards that the
United States Department of Transportation has
set.
Tire Quality Grades apply to new pneumatic
tires for use on passenger cars. They do not
apply to deep tread, winter-type snow tires,
space-saver or temporary use spare tires, tires
with nominal rim diameters of 10 to 12 inches or
limited production tires as defined in Title 49
Code of Federal Regulations Part 575.104(c)(2).
U.S. Department of Transportation — Tire
quality grades:
The U.S. Department of
Transportation requires Ford to give you the
following information about tire grades exactly
as the government has written it.
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. The relative performance of tires
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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 A B C
The traction grades, from highest to lowest, are
A, B, and C, and they 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.
R
WARNING
The traction grade assigned to this tire is
based on braking (straightahead) traction
tests and does not include cornering
(turning) traction.
Temperature A B C
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 Vehicle
Safety Standard No. 109. Grades B and A
represent higher levels of performance on the
laboratory test wheel than the minimum
required by law.
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