Tire Sidewall Information - Aston Martin DB 9 2010 Manual

Temperature
Warning: 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.
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 vehicle 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.

Tire Sidewall Information

Both U.S. and Canada Federal regulations require tire manufacturers
to place standardized information on the sidewall of all tires. This
information identifies and describes the fundamental characteristics
of the tire and also provides a Tire Identification Number for safety
standard certification and incase of a recall.
Information on 'P' Type Tires
'P215/65R1595H' is an
3 4 5 6
example of a tire size, load
2
index and speed rating. The
1
definitions of these items are
listed below.
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12
11
The tire size, load index and speed rating for your vehicle may be
different from this example.
[1] P- A tire, designated by the Tire and Rim Association (T&RA), that
may be used for service on cars, SUVs, minivans and light trucks.
If your tire size does not begin with a letter this may mean it is
designated by either ETRTO (European Tire and Rim Technical
Organization) or JATMA (Japan Tire Manufacturing Association).
7
[2] 215- The nominal width of the tire in millimeters from side wall
8
edge to side wall edge. In general, the larger the number, the wider
9
the tire.
[3] 65- The aspect ratio which gives the tire's ratio of height to width.
10
[4] R- Shows a "radial" type tire.
11.17