IndexSpeedrating
ZR...Y
1
up to 186mph (300 km/h)
ZR...(..Y)
1
over186 mph(300 km/h)
ZR
1
over149 mph(240km/h)
R
Specifying thespeed rating as the"ZR" index
in tirecode 4 is optional fortires up to
186mph (300 km/h).
R
If your tirecode 4 includes "ZR" and there
is no speed rating 7,find out what themax‐
imum speed is from thetiremanufacturer.
R
If load-bearing index 6 and speed rating 7
areinbrackets, themaximum speed rating of
your tireisabove 186mph (300 km/h). To
find outthe maximum speed, ask thetire
manufacturer.
All-weather tires and winter tires
IndexSpeedrating
QM+S
2
up to 100mph (160 km/h)
TM+S
2
up to 118mph (190 km/h)
HM+S
2
up to 130mph (210 km/h)
VM+S
2
up to 149mph (240 km/h)
Winter tires bear the i snowflakesymbol
and fulfill therequirements of theRubber Manu‐
facturersAssociation (RMA) and theRubber
AssociationofCanada (RAC) regarding thetire
traction on snow.
Load index 88:
R
No specification given: standardload (SL)
tire
R
"XL" or "Extra Load": extraloadtireorrein‐
forced tire
R
"Light Load": light load tire
R
"C", "D", "E": aload rangethat dependson
themaximum load that thetirecan carry at a
certain pressure
Definition of termsfor tiresand loading
Tire structure and characteristics: describes
thenumber of layers or thenumber of rubber-
coated belts in thetirecontact surface and the
tirewall. These aremade of steel, nylon, poly‐
esterand other materials.
Bar: metric unit fortirepressure.
14.5038 pounds per squareinch(psi) and
100kilopascal(kPa) is theequivalent of one bar.
DOT(Department of Transportation): DOT-
markedtires fulfill therequirements of the
US Department of Transportation.
Averageweight of thevehicle occupants: the
numberofvehicle occupants forwhich thevehi‐
cle is designed, multiplied by 150lb(68 kg).
1
"ZR" stated in thetirecode.
2
Or "M+S i"for winter tires
464
Wheels and tires
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