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Index
Index
Speed r
Speed rating
ating
up to 186 mph (300 km/h)
1
ZR...Y
1
over 186 mph (300 km/h)
ZR...(..Y)
over 149 mph (240 km/h)
ZR
1
Specifying the speed rating as the "ZR" index
R
in tire code
4
is optional for tires up to
186 mph (300 km/h).
If your tire code
4
includes "ZR" and there is
R
no speed rating 7, nd out what the maxi-
mum speed is from the tire manufacturer.
If load-bearing index
6
and speed rating
R
are in brackets, the maximum speed rating of
your tire is above 186 mph (300 km/h). To
nd out the maximum speed, ask the tire man-
ufacturer.
"ZR" stated in the tire code.
1
Or "M+Si" for winter tires.
2
All-weat
All-w
eather tir
her tires and wint
es and winter tir
Index
Index
Speed r
Speed rating
ating
2
up to 100 mph (160 km/h)
Q M+S
up to 118 mph (190 km/h)
T M+S
2
up to 130 mph (210 km/h)
2
H M+S
2
up to 149 mph (240 km/h)
V M+S
Winter tires bear the i snow ake symbol and
www.carobook.com
ful ll the requirements of the Rubber Manufactur-
ers Association (RMA) and the Rubber Association
of Canada (RAC) regarding the tire traction on
7
snow.
Load inde
Load index x
8
8
: :
No speci cation given: standard load (SL) tire
R
"XL" or "Extra Load": extra load tire or rein-
R
forced tire
"Light Load": light load tire
R
er tires es
R
De nition
De nition of t
T T ir ire s
e str tructur
number of layers or the number of rubber-coated
belts in the tire contact surface and the tire wall.
These are made of steel, nylon, polyester and
other materials.
Bar:
Bar: metric unit for tire pressure. 14.5038 pounds
per square inch (psi) and 100 kilopascal (kPa) is
the equivalent of one bar.
DOT (Depar
DO
tires ful ll the requirements of the
US Department of Transportation.
Av Aver erag age w
number of vehicle occupants for which the vehicle
is designed, multiplied by 150 lb (68 kg).
U U nif nifor orm T
standard to grade the quality of tires with regard
Wheels and tires 397
"C", "D", "E": a load range that depends on the
maximum load that the tire can carry at a cer-
tain pressure
of ter erms f
ms for tir
or tires and loading
es and loading
ucture and c
e and char
haract
acter eris istics:
tics: describes the
T (Department of Tr
tment of Transport
ansportation):
ation): DOT-marked
e weight of t
eight of the v
he vehicle occupants:
ehicle occupants: the
m Tir ire Quality Gr
e Quality Grading St
ading Standar
andards:
397
ds: a uniform
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