What is the minimum Tire Tread Depth?

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Minimum Tire Tread Depth:

In many countries, tire tread measurements are usually expressed in 32nds of an in.. for instance, all-season passenger tires often have tread depths from 9/32-inch to 11/32-inch when new.

Most states have established a 2/32-inch minimum tread depth requirement, which needs motorists to switch a tire when the tire wears all the way down to that depth. Irrespective of which state you reside in, Bridgestone recommends that a tire get replaced when any portion of the tread is at 2/32-inch depth.

How does one know if you’ve reached the 2/32-inch threshold? Use the tire tread depth indicators found within the tread grooves. Every passenger, light truck, and medium truck tire has these indicators, also referred to as wear bars, at various places around the tire. Tread depth indicators are there so you’ll visually determine whether you have got reached 2/32-inch in this groove without having to live the depth with a tool. Replace any tire where the tread ribs become flush with the indicator bars.

Another method of evaluating a tread depth gage is the “penny test.” Place a penny, with its head the other way up, into the groove between the tread ribs. If you can’t see the highest of its head between the ribs, the tread is a minimum of 2/32-inch deep at that location. If Abe’s whole head is visible at any groove location, you ought to replace that tire.

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