Tire Tread Depth Chart
Place a quarter into several tread grooves across the tire.
Tire tread depth chart. Our half tread tires began to skim over the waters surface at as slow as 40 mph in our hydroplane test about 3 to 4 mph slower than the full tread tires. As the chart in all season tire wear. However when tires near the end of their life a penny can be used to confirm tread depth. The quarter test can show if your tread depth has worn to or below 432nds of an inch.
If a tire comes new with 1032nds of rubber you have 832nds of usable rubber. If the tire tread is at least touching abraham lincolns upside down head the tire tread depth is at least 232. To perform the quarter test take a quarter and place it into your tread groove with george washingtons head facing downward. There are several popular ways to check your tire tread depth.
Place a penny into several tread grooves across the tire. For example a tire that started with 1032 of original tread depth and has worn off 432 down to 632 of remaining tread depth is 50 worn. A new tire retains a tread depth from 1032 to 1132. Useable tread depth is calculated by subtracting 232 from the tires new tread depth.
If you can see all of lincolns head your tread depth is less than 232 inch and its time to replace your tires. One easy way is the penny test. Mark where on the tread meets the penny. New tires typically come with 1032 or 1132 tread depths and some truck suv and winter tires may have deeper tread depths than other models.
Simply insert a penny into your tires tread groove with lincolns head upside down and facing you. Tires must be replaced when the wear bars are visible at 232nds. To measure the tread of a tire using an available chart follow these steps. Usually rotating your tires between 6000 and 8000 miles is good unless otherwise specified by your tire retailer or car manufacturer.
If part of lincolns head is always covered by the tread you have more than 232 of tread depth remaining. This tread depth is usually made to last anywhere from 3 to 5 years depending on how well it is maintained. Turn a penny upside down and place it inside the tire tread. It is very difficult to accurately measure tire tread depth at home without a tread depth gauge.
If you find your tire tread is approaching 232 our firestone tire and auto service professionals will inspect your tires for free. If you can see the top of washingtons head then your tires have worn below 432nds of an inch. Then usable tread depth is compared to remaining tread depth in order to calculate tread wear percentages.