Saturn 2007 Ion Owner's Manual page 340

Directional Tires
If your vehicle has 215/45ZR17 size tires, they are
directional tires and must roll in a certain direction
for the best overall performance. The direction is
shown by an arrow on the tire sidewall. Because
these tires are directional, they should be rotated as
shown here. These tires should only be moved from
front to rear and rear to front on the same side of
the vehicle.
Do not include the compact spare tire in your tire
rotation.
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After the tires have been rotated, adjust the front
and rear inflation pressures as shown on the
Tire and Loading Information label. See Loading
Your Vehicle on page 250 for an example of
the tire and loading information label and
its location on your vehicle. Make certain that all
wheel nuts are properly tightened. See "Wheel Nut
Torque" under Capacities and Specifications on
page 384.
CAUTION:
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Rust or dirt on a wheel, or on the parts to
which it is fastened, can make wheel bolts
become loose after a time. The wheel
could come off and cause an accident.
When you change a wheel, remove any
rust or dirt from places where the wheel
attaches to the vehicle. In an emergency,
you can use a cloth or a paper towel to do
this; but be sure to use a scraper or wire
brush later, if you need to, to get all the
rust or dirt off. See Changing a Flat Tire
on page 350.