Maserati GranTurismo Sport 2015, Owner'S Manual

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During the tire life the rolling
direction of the first fitting
shall always be observed,
also in case of “non-directional” tires.
Check the depth of the tire
tread at regular intervals
(minimum allowed value
0.06 in / 1.6 mm). As the tread wear
increases, there is a greater risk of
skidding.
Drive carefully on wet
roads to decrease the risk of
aquaplaning.
Impacts with curbs, holes, and
obstacles in the road, and prolonged
trips on rough roads can cause tire
damage which may not be visible to
the naked eye.
Check your tires regularly for any
signs of damage (e.g., scratches, cuts,
cracks, bulges, etc.).
If sharp objects penetrate the tires,
they can cause damage, which is only
visible when the tire is removed.
In any case, any possible damage must
be inspected by an experienced tire
fitter, as it may seriously reduce tire
life.
Remember that tires deteriorate with
time, even if used little or not at all.
Cracks in the tire tread and sides,
alongside possible bulging, are a sign
of deterioration. Have the old tires inspected
by an experienced tire fitter,
to make sure they can still
be used safely. If the same tire has
been on your vehicle for 4 or 5 years,
have it inspected anyway by an
experienced tire fitter.
Never fit tires of uncertain
origin.
“Directional” tires have an
arrow on their side showing
the rolling direction. To help
maintain optimal performance when
replacing a tire, make sure that the
rolling direction corresponds to the
one marked by the arrow.