Step 6:Carefully remove gauge by holding its barrel (without touching the probe) and confirm the tread depth reading.Step 5:Do not place the probe on the molded tread wear indicators or on any raised surfaces of the tread design.Step 4:Place the probe into the center of a circumferential tire groove and push down on the gauge’s base.Step 3:Push the measuring scale into the gauge as far as it will go.
Step 2:Push the tread depth gauge against a hard, flat surface to confirm it “zeros out” when fully compressed.Some tread depth gauges measure in 32nds of an inch (left), while others measure in both 32nds of an inch and millimeters (right). Step 1:Confirm which measuring scale you are using.To use a tread depth gauge, follow the steps below. Some tire tread depth gauges measure up to 25-26mm (or 32/32nds) since almost all passenger car and light truck tires begin with less than one inch of tread depth. While coins can be used to estimate remaining tread depth as a tire approaches the end of its useful life, the established method of measuring remaining tread depth in Canada is with a gauge that reads in millimeters (or in 32nds of an inch). The result is hydroplaning, sliding, and decrease braking efficiency. At this depth, your vehicle’s tires will not adequately evacuate water and snow. Any grove under this minimum depth is designated unsafe. Minimum tread depth should be 2.5mm or about 3/32. This often allows the cause to be identified and corrected before excessive or irregular tread wear ruins the tire.
An accurate tread depth gauge can detect developing wear patterns earlier than simply looking at the tread.
Incorrect air pressure, vehicle alignment, loose or worn parts, driving conditions, load, etc, can cause rapid or uneven tire wear.
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