Mazda 6 2006 Owner's Manual page 328

Customer Information and Reporting Safety Defects
Tire Information (U.S.A.)
Rotate unidirectional tires and radial tires that have an asymmetrical tread pattern or
studs only from front to rear, not from side to side. Tire performance will be weakened if
rotated from side to side.
Don't use the following:
Tires not of the designated size
l
Tires of different sizes or types at the same time
l
Tires not sufficiently inflated
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If these instructions aren't followed, the rotation of the left and right wheels will be
different and will thus apply a constant load on the limited-slip differential.
This will cause a malfunction.
qReplacing a Tire
Worn Tires:
Driving with worn tires is dangerous. Reduced braking, steering, and traction could
result in an accident. Always use tires that are in good condition.
If a tire wears evenly, a wear indicator will appear as a solid band across the tread. Replace
the tire when this happens.
You should replace it before the band is across the entire tread.
9-28
CAUTION
WARNING
New tread
Tread wear indicator
Worn tread