Maserati GranTurismo Owner's Manual page 50

Understanding the Vehicle
rolling resistance resulting in higher fuel
consumption.
Ride comfort and vehicle stability
Proper tire inflation contributes to
a comfortable ride. Over-inflation
2
produces a jarring and uncomfortable
ride.
Tire Pressure Checkup
The proper cold tire inflation pressure
is indicated on the table "Tire Inflation
Pressure" in section "Technical
Specifications".
Inflation pressure specified on the table
always refers to "cold tire inflation
pressure". Cold tire inflation pressure
is defined as the tire pressure after the
vehicle has not been driven for at least
three hours, or driven less than 1.6 km (1
mi) after a three hour period.
Check tire pressures more often in
case of significant outside temperature
changes, as tire pressure varies
according to temperature changes.
The pressure should be checked and if
necessary adjusted; tire wear and overall
conditions should also be checked
monthly. Tire pressures change by
approximately 0.07 bar per 7°C of air
temperature change. Keep this in mind
when checking tire pressure inside a
garage, especially in winter.
48
Example: If garage temperature = 20°C
and the outside temperature = 0°C then
the cold tire inflation pressure should be
increased by 0.21 bar for every 7°C for
this outside temperature condition.
Tire pressure may increase from 0.13 to
0.4 bar during operation. DO NOT reduce
this normal pressure build-up or your tire
pressure will be too low.
After inspecting or adjusting the tire
pressure, always reinstall the valve stem
cap. This will prevent moisture and dirt
from entering the valve stem, which
could damage the valve stem and the
TPMS sensor connected to it.
Tread Wear Indicators
Tread wear indicators are in the original
equipment tires to help you determine
when your tires should be replaced.
These indicators are moulded into the
bottom of the tread grooves. They will
appear as bands when the tread depth
becomes 1,6 mm (0.06 in) or 4 mm (0.16
in) for winter, all-season and snow tires.
When the tread is worn to one of the
tread wear indicators, the tire should be
replaced.
WARNING!
The wet performance (aquaplaning
resistance) will decrease proportionally
to the thickness of the tread.
Tires Durability
The service life of a tire depends on
various factors including, but not limited
to:
• driving style;
• tire pressure;
• distance driven.
WARNING!
Tires and the spare tire (if equipped)
should be replaced after six years,
regardless of the remaining tread.
Failure to follow this warning can result
in tire failure. You could lose control and
have a collision resulting in serious
injury or death.
Replacement Tires
NOTE:
In order to maintain high performance
and safety level under all driving
conditions, Maserati strongly
recommends to use tires equivalent
to the originals in size, quality and
performance when replacement is
needed.