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Maximum load on one tire: maximum load on one
tire. This is calculated by dividing the maximum
axle load of one axle by two.
PSI (pounds per square inch): standard unit of
measurement for tire pressure.
Aspect ratio: ratio between tire height and tire
width in percent.
Tire pressure: the pressure inside the tire which
applies an outward force to every square inch of
the tire. The tire pressure is specified in pounds
per square inch (psi), in kilopascals (kPa) or in bar.
The tire pressure should only be corrected when
the tires are cold.
Cold tire pressure: the tires are cold when the
vehicle has been parked for at least 3 hours with-
out direct sunlight on the tires or the vehicle has
been driven for less than 1 mile (1.6 km).
Tire contact surface: the part of the tire that
comes into contact with the road.
Tire bead: the purpose of the tire bead is to
ensure that the tire sits securely on the wheel rim.
There are several wire cores in the tire bead to
prevent the tire from changing length on the
wheel rim.
Side wall: the part of the tire between the tread
and the tire bead.
Weight of optional equipment: the combined
weight of the optional equipment weighing more
than the replaced standard parts and more than
5 lbs (2.3 kg). This optional equipment, such as
high-performance brakes, level control system, a
roof luggage rack or high-performance batteries,
is not included in the curb weight and the weight
of the accessories.
TIN (Tire Identification Number): a unique identifi-
cation number which can be used by a tire manu-
facturer to identify tires, for example, in a product
recall, and thus identify the purchasers. The TIN is
made up of the manufacturer's identity code, tire
size, tire type code and the manufacturing date.
Load-bearing index: the load-bearing index is a
code that contains the maximum load-bearing
capacity of a tire.
Traction: traction is the grip resulting from friction
between the tires and the road surface.
Wear indicator: narrow bars (tread wear bars) that
are distributed over the tire contact surface. If the
Wheels and tires 427
tire tread is level with the bars, the wear limit of
1/16 in (1.6 mm) has been reached.
Distribution of vehicle occupants: distribution of
vehicle occupants over designated seat positions
in a vehicle.
Maximum permissible payload weight: nominal
load and luggage load plus 150 lb (68 kg) multi-
plied by the number of seats in the vehicle.
Changing a wheel
Notes on selecting, installing and replacing tires
* NOTE Mercedes-AMG vehicles
Observe the notes in the Supplement.
#
You could otherwise fail to recognize
dangers.
& WARNING Risk of accident due to incor-
rect wheel and tire dimensions
If wheels and tires of the wrong size are instal-
led, the service brakes or components in the
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