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R18. The rim diameter is part of the tire size.
You can find it on the tire side wall
(
page 371).
/
Be sure to also observe the following further
related subjects:
Notes on tire pressure (
page 358)
/
R
Tire and Loading Information placard
R
(
page 364)
/
Maximum tire pressure (
page 370)
/
R
Checking tire pressures manually
Read the tire pressure for the current operat‐
#
ing conditions from the Tire and Loading
Information placard or the tire pressure
table. Observe the notes on tire pressure.
Remove the valve cap of the tire to be
#
checked.
Press the tire pressure gauge securely onto
#
the valve.
Read the tire pressure.
#
If the tire pressure is lower than the recom‐
#
mended value, increase the tire pressure to
the recommended value.
If the tire pressure is higher than the recom‐
#
mended value, release air. To do so, press
down the metal pin in the valve, e.g. using
the tip of a pen for example. Then check the
tire pressure again using the tire pressure
gauge.
Screw the valve cap onto the valve.
#
Further related subjects:
Notes on tire pressure (
page 358)
/
R
Tire pressure table (
page 360)
/
R
Tire and Loading Information placard
R
(
page 364)
/
Wheels and tires 361
Tire pressure monitoring system
Function of the tire pressure monitoring sys‐
tem
& DANGER Risk of accident due to incor‐
rect tire pressure
Each tire, including the spare (if provided),
should be checked monthly when cold and
then inflated to the inflation pressure recom‐
mended by the vehicle manufacturer on the
vehicle placard or tire inflation pressure
label. (If your vehicle has tires of a different
size than the size indicated on the vehicle
placard or tire inflation pressure label, you
should determine the proper tire inflation
pressure for these tires.)
As an added safety feature, your vehicle has
been equipped with a tire pressure monitor‐
ing system (TPMS) that illuminates a low tire
pressure telltale when one or more of your
tires is significantly underinflated. Accord‐
ingly, if the low tire pressure telltale illumi‐
nates, you should stop and check your tires
as soon as possible, and inflate them to the
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