Tire Labeling; Dot Tire Quality Grading - Honda ridgeline Owner's Manual

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Tire Labeling

The tires that came on your vehicle have a number of markings. Those you
should be aware of are described below.
Here is an example of what each marking means:
P235/60R18 102V
• P: vehicle type (P indicates passenger vehicle)
• 235: tire width in millimeters
• 60: aspect ratio (tire section height as a
percentage of its width)
• R: tire construction code (radial)
• 18: rim diameter in inches
• 102: load index (code indicating maximum load
tire can carry)
• V: speed symbol (code indicating maximum
speed rating)
Tire Identification Number (TIN)
n
The tire identification number
(TIN) is a group of numbers and
letters that look like the example
below. TIN is located on the
sidewall of the tire.
Glossary of Tire Terminology
n
Cold Tire Pressure – The tire air pressure when the vehicle has been parked
for at least three hours or driven less than 1 mile (1.6 km).
Load Rating – The maximum load that a tire is rated to carry for a given
inflation pressure.
Maximum Inflation Pressure – The maximum tire air pressure that the tire
can hold.
Maximum Load Rating – The load rating for a tire at the maximum
permissible inflation pressure for that tire.
Recommended Inflation Pressure – The cold tire inflation pressure
recommended by the manufacturer.
Treadwear Indicators (TWI) – The projections within the principal grooves
designed to give a visual indication of the degrees of wear of the tread.
150 |
Tire size
Tire
identification
number (TIN)
Maximum
tire load
Maximum
tire pressure
Tire size
DOT B97R FW6X 2209
DOT: This indicates that the tire meets all
requirements of the U.S. Department of
Transportation.
B97R: Manufacturer's identification mark
FW6X: Tire type code
22 09: Date of Transportation
Year
Week

DOT Tire Quality Grading

The tires on your vehicle meet all U.S. Federal Safety Requirements. All tires are also
graded for treadwear, traction, and temperature performance according to Department
of Transportation (DOT) standards. The following explains these gradings.
Uniform Tire Quality Grading
n
Quality grades can be found where applicable on the tire sidewall between tread
shoulder and maximum section width.
For example:
Treadwear 200
Traction AA
Temperature A
All passenger car tires must conform to Federal Safety Requirements in addition to
these grades.
Treadwear
n
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 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
n
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.
WARNING: 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.
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