Wheels and tyres
8-16 Maintenance and care
7, Tyre manufacturing standard
information
Most of this information relates to the tyre
manufacturer and the place of
manufacture. The last four numbers
represent the week and year the tire was
built. For example, the numbers 1706
means the 17th week of 2006. The other
numbers are marketing codes used at the
manufacturer's discretion. This
information can be used to contact
consumers if a tire defect requires a recall.
8, Maximum permissible inflation
pressure
The maximum inflation pressure for the
tire. This pressure should not be used for
normal driving.
9, Treadwear grade
This number indicates the tire's wear rate.
The higher the treadwear number is, the
longer it should take for the tread to wear
down. A tire rated at 400 for example, will
last twice as long as a tire rated at 200.
10, Traction grade
This letter indicates a tire's ability to stop
on wet pavement. A higher graded tire
should allow you to stop your vehicle on
wet roads in a shorter distance than a tire
with a lower grade.
Traction is graded from highest to lowest
as AA, A, B, and C.
11, Temperature grade
Heat resistance grading. The tires
resistance to heat is grade A, B, or C, with
A indicating the greatest resistance to
heat. This grading is provided for a
correctly inflated tire, which is being used
within its speed and loading limits.
12, Tire composition and materials
The number of plies in both the tread area,
and the sidewall area, indicates how many
layers of rubber coated material make up
the structure of the tire. Information is also
provided on the type of materials used.
Rating Speed (mph)
Q99
R106
S 112
T118
U124
H130
V149
W168
Y 186
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