Saab 9-5 2011 Owner's Manual page 215

214 Vehicle care
Tire identification number (TIN) : The
letters and numbers following DOT
code are the Tire Identification Num‐
ber (TIN). The TIN shows the manu‐
facturer and plant code, tire size, and
date the tire was manufactured. The
TIN is molded onto both sides of the
tire.
Tire ply material : The type of cord and
number of plies in the sidewall and
under the tread.
Uniform Tire Quality Grading
(UTQG) : Tire manufacturers are re‐
quired to grade tires based on the
performance factors: treadwear, trac‐
tion and temperature resistance.
Maximum cold inflation load Limit :
Maximum load that can be carried
and the maximum pressure needed
to support that load.
Tire size
Following example shows the desig‐
nation of a typical passenger car tire
size:
E.g. 225/55 R 17 95 W
225 = Tire section width, mm
55 = Aspect ratio,i.e. the section
height as a percentage of the
section width, %
R = Belt rating, radial
17 = Rim diameter, inches
95 = Load range e.g. 95 is equiv‐
alent to 1521 lbs.
W = Speed rating
Tire width : The three-digit number in‐
dicates the tire section width in milli‐
meters from sidewall to sidewall.
Aspect ratio : A two-digit number that
indicates the tire height-to-width
measurements. For example, if the
tire size aspect ratio is "55", as shown
in the example above, it would mean
that the tire's sidewall is 55 % as high
as it is wide.
Belt rating : A letter code is used to
indicate the type of ply construction in
the tire. The letter "R" means radial
ply construction; the letter "D" means
diagonal or bias ply construction; and
the letter "B" means belted-bias ply
construction.
Rim diameter : Diameter of the wheel
in inches.
Load range : The load range repre‐
sents the load carry capacity a tire is
certified to carry.
Speed rating : The maximum speed
that a tire is certified to carry a load.
Speed ratings range from "A" to "Z".
Tire load indices
91 = Tire approved for max.
1355 lbs.
93 = Max. 1433 lbs.
94 = Max. 1477 lbs.
95 = Max. 1521 lbs.
97 = Max.1609 lbs.
98 = Max. 1653 lbs.
Speed code letter:
Q = Tire approved for speeds up to
100 mph.
S = Max. up to 112 mph.
T = Max. up to 118 mph.
H = Max. up to 130 mph.
V = Max. up to 150 mph.
W = Max. up to 168 mph.
Y = Max. up to 186 mph.