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The typical new tire used on automobiles is measured with 10/32” to 11/32” of tread depth. With winter/snow and light truck tires the tread is deeper because this depends on the tire’s tread type, which is either the Highway Rib, Highway All-Season, Off-Road All-Terrain or Off-Road Maximum Traction.
“We typically advise that shopping should begin when tires are down to 4/32 of an inch, but with snow, you want to make sure you have at least that tread depth in the middle of winter, even...
The minimum tread depth is 2/32 (1.6 mm). This means that it is imperative to change your tires once this limit has been reached to avoid compromising your safety and breaking the law. But it also means that it is premature to change your tires before this threshold.
A good tire tread depth is 5/32″ or greater. Tires with 4/32″ or less depth are recommended to be replaced. Once tires reach 2/32″ they are considered bald must be replaced for your safety. Stopping distance on wet roads increases as tread depth decreases. The risk of hydroplaning also increases.
The tread height typically ranges from 7.5 to 8.5 mm, with performance models going down to 5-6 mm. For instance, the Bridgestone Turanza T005 varies from 6.9 to 7.2 mm. The recommended minimum residual tread depth for summer tires is 2/32 inches (1.6 mm).
Goodyear suggests checking your tire tread depth every 3,000 mi. (5,000 km) or once it reaches 4/32 inches deep. If your tread depth reads 2/32 inches of less, it's time to replace your tires.
Minimum Tire Tread Depth. Legally, the minimum tread depth is going to vary from state to state: In 42 states, 2/32 is the legal minimum tread depth; In 2 states, 1/32 is the legal minimum tread depth (California & Idaho) In 6 states, there is no legal minimum tread depth (Arkansas, Montana, North Dakota, South Carolina, West Virginia)
The minimum safe tread depth is typically considered to be 2/32 or 1/16 of an inch. This is the minimum legal tread depth in most states, and it is the point at which the tire's ability to provide adequate traction is compromised.
New tires for passenger cars and trucks typically have 10/32″ to 11/32″ of tread depth. It’s recommended that tires be replaced once the tread has worn to 4/32″ of remaining depth. The legal minimum in most states is 2/32″.
While there is no national law in the U.S. specifying minimum legal tread depth, most state laws require a tire to have at a tread depth of at least 2/32nds of an inch.