09 Wheels and tyres
09
Wheel and wheel rim dimensions
Tyres - dimensions
Related information
Tyres - speed ratings (p. 328)
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Wheel and rim dimensions are designated in
accordance with the examples in the table
below.
The car's tyres have a certain dimension, see
the examples in the table below.
Tyres - load index (p. 328)
Tyres - direction of rotation (p. 324)
Tyres - maintenance (p. 323)
The dimensions are stated on all car tyres.
Example of designation: 225/50R17 98W.
The car has an approval for the complete
vehicle. This means that certain combinations
of wheel (wheel rim) and tyre are approved.
Tyres - approved tyre pressures (p. 420)
Wheel and wheel rim dimensions (p. 327)
225 Tyre width (mm)
Wheels (rims) have a designation of dimen-
sions, for example: 7Jx16x50.
50 Ratio between tyre wall height and
tyre width (%)
R
Radial ply
7
J
Rim width in inches
Rim flange profile
17 Rim diameter in inches (")
98 Codes for the maximum permitted
tyre load, tyre load index (LI)
16 Rim diameter in inches
50 Off-set in mm (distance from wheel
centre to wheel contact surface
against the hub)
W
Speed rating for maximum permitted
speed, speed rating (SS). (In this
case 270 km/h (168 mph).)
Related information
Tyres - dimensions (p. 327)
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The car has an approval for the complete
vehicle with certain combinations of wheel
rims and tyres.
Tyres - approved tyre pressures (p. 420)
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WARNING
19-inch wheels must never be used on
cars that are not equipped with the R-
Design or Sport chassis options. The use
of 19-inch wheels on cars with standard
chassis constitutes a safety risk, with a
risk of vehicle damage, and it impairs the
car's driving characteristics.
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