Buick PARKAVENUE 1994 Manual page 265

When It's Time for New Tires
0
One way to tell when it's
time for new tires is to
check the treadwear
indicators, which will
appear when your tires
have only 2/32 inch (1.6
mm) or less of tread
remaining.
You need a new tire if
You can see the indicators at three or more places
around the tire.
You can see cord or fabric showing through the tire's
rubber.
The tread or sidewall is cracked, cut or snagged deep
enough to show cord or fabric.
The tire has a bump, bulge or split.
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