Polestar 2 2020, Manual

Page: 454 / 568

Dimension designation
for tyre
Designations for tyre dimension, load index and
speed rating.
The car has an approval for the complete vehi-
cle with certain combinations of wheel rims and
tyres.
Designation of dimensions
All tyres have a designation of dimensions, for
example: 245/45 R19 98 W
245 Tyre width (mm)
45 Ratio between tyre wall height and tyre
width (%)
R Radial ply
19 Rim diameter in inches
98 Codes for the maximum permitted tyre
load, tyre load index (LI)
W Speed rating for maximum permitted
speed, speed rating (SS). (In this case
270 km/h (168 mph).)
Load index
Each tyre has a certain capacity to carry a load, a
load index (LI).
Speed rating
Each tyre can withstand a certain maximum
speed. Tyre speed rating, SS (Speed Symbol),
must at least correspond with the car's top
speed. The table below shows the maximum
permitted speed for each speed rating (SS). The
only exception to these regulations is winter
tyres
162
, where a lower speed rating may be
used. If such a tyre is selected, the car must not
be driven more quickly than the tyre is rated for.
For example, cars with Q rating tyres must be
driven at speeds not exceeding 160 km/h (100
mph). The road conditions and applicable road
traffic rules determine how quickly the car can
be driven, not the speed rating of the tyres.
Q 160 km/h (100 mph) (used only on winter
tyres)
T 190 km/h (118 mph)
H 210 km/h (130 mph)
V 240 km/h (149 mph)
W 270 km/h (168 mph)
Y 300 km/h (186 mph)
Related information
• Tyres (p. 452)
• Dimension designation for wheel rim (p. 455)
• Approved wheel and tyre sizes (p. 551)
• Minimum permitted tyre load index and
speed rating for tyres (p. 552)
WARNING
The lowest permitted tyre load index (LI)
and speed rating (SS) for the tyres for
each respective engine variant are
shown in the specifications, which can be
found in the printed Manual. If a tyre with
too low a load index or speed rating is
used, it may overheat and be damaged.
NOTE
The maximum permitted speed is speci-
fied in the table.
162 Both those with metal studs and those without.
454 Wheels and tyres