What is the recommended method for checking tread depth?

The recommended method for checking tread depth involves using a tread depth gauge or the penny test. A tread depth gauge is a precise tool designed specifically to measure the depth of the tire tread grooves, ensuring accurate readings that help determine whether the tires are still safe for use. This method provides a clear and objective measurement of the tread depth in millimeters or 32nds of an inch.

The penny test is a quick, practical method that involves inserting a penny into the tread grooves with Lincoln's head facing down. If you can see all of Lincoln's head, the tread is too worn and the tire likely needs to be replaced. This simple test is effective for quick assessments and serves as a good visual cue for tire wear.

While measuring the tire diameter with a tape measure and performing a visual inspection might provide some information, these methods do not yield precise measurements of tread depth and could result in misjudgments regarding tire safety. Comparing tread wear to new tire specifications can give context to tread condition but does not provide a direct measurement of the current tread depth. Therefore, using a tread depth gauge or the penny test is the most reliable approach for assessing tire tread wear effectively.