A tire tread depth gauge costs about $5. Measure the tread depth about 1 in. from each edge and the depth of the center tread ...

If your tire treads are still way above the wear bars and you want to know how much depth you still have, another must-have tool is a tread depth gauge. This can provide you with a more accurate ...

Pinching pennies. Grooves reveal more of Lincoln's head as tires wear; wet-weather grip declines long before the top is visible. Gauging wear. A tread-depth gauge shows wear more precisely.