Saturn 2009 ASTRA - Manual (Page 243)

Wheel Replacement
Replace any wheel that is bent,
cracked or badly rusted or corroded.
If the wheel bolts keep coming
loose, the wheel and wheel bolts
should be replaced. If the wheel
leaks air, replace it (except some
aluminum wheels, which can
sometimes be repaired). See your
dealer/retailer if any of these
conditions exist.
Your dealer/retailer will know the
kind of wheel you need.
Each new wheel should have the
same load-carrying capacity,
diameter, width, offset and be
mounted the same way as the
one it replaces.
If you need to replace any of the
wheels or wheel bolts, replace them
only with new GM original equipment
parts. This way, you will be sure to
have the right wheel and wheel bolts
for the vehicle.
{ CAUTION
Using the wrong replacement
wheels or wheel bolts on your
vehicle can be dangerous. It could
affect the braking and handling of
the vehicle, make the tires lose air
and make you lose control of
the vehicle. You could have a
collision in which you or others
could be injured. Always use the
correct wheel and wheel bolts for
replacement.
Notice: The wrong wheel can
also cause problems with bearing
life, brake cooling, speedometer
or odometer calibration,
headlamp aim, bumper height,
vehicle ground clearance, and tire
or tire chain clearance to the
body and chassis.
See Changing a Flat Tire on
page 9-61 for more information.
Used Replacement Wheels
{ CAUTION
Putting a used wheel on the
vehicle is dangerous. You cannot
know how it has been used or
how far it has been driven.
It could fail suddenly and cause a
crash. If you have to replace a
wheel, use a new GM original
equipment wheel.
Vehicle Service and Care 9-59