Useable tread depth is calculated by subtracting 2/32" from the tires' new tread depth. Then usable tread depth is compared to remaining tread depth in order to calculate tread wear percentages. For example, a tire that started with 10/32" of original tread depth and has worn off 4/32" (down to 6/32" of remaining tread depth) is 50% worn. ...
New tires typically come with 10/32” or 11/32” tread depths, and some truck, SUV and winter tires may have deeper tread depths than other models. The U.S. Department of Transportation recommends replacing tires when they reach 2/32”, and many states legally require tires to be replaced at this depth.
Its useable tread depth is calculated by subtracting a worn out tire's 2/32" from the new tire's original depth of 10/32". The final 2/32" of a tire's tread depth isn't part of the equation when it comes to calculating tread depth percentages because the tire is already legally worn out with just 2/32" of remaining tread depth.
The average tread depth on new tires ranges from 10/32 of an inch to 11/32 of an inch. This guideline is not standardized among all tires and only serves as an estimation.
Sufficient tread depth in one area of the tire doesn’t compensate or cover for insufficient tread depth elsewhere on the tire. If the top of the Lincoln Memorial is covered, then you have more than 2/32" of tread.
Another way to check tread depth is to look at the treadwear indicator bar that's molded into most tires. The bars are located at the bottom of the tread grooves in several locations around the tire. When these bars become visibly flush with the adjacent ribs the tire has no more than 2/32" of tread remaining.
Tire tread depth measures the height of the line extending from the deepest part of the tread void to the top of the tread block. This indicates the amount of remaining tread. Regularly checking your tire tread depth can help you determine when it is time to replace your tires.
In its November issue, Consumer Reports recommended consumers use a quarter instead of a penny to measure tread depth - a change that effectively doubles the depth at which car owners should consider getting new tires from 2/32 to 4/32 inch.
New tire tread depth: Is measured from the top of the molded tread to the bottom of the deepest circumferential groove. This is the tread depth value typically published by tire manufacturers. Useable tire tread depth: used only for tire warranty percentage of wear calculations. This value is also measured from the top of the molded tread to ...
If the tires haven't been replaced 10 years after their date of manufacture, as a precaution, Michelin recommends replacing them with new tires. Even if they appear to be in usable condition and have not worn down to the tread wear indicator.