Tire guides
Learn how to read your tire size, check your tread, and decide between used and new tires.
How to read tire size
A tire size like 205/55R16 91V means 205 mm wide, a sidewall 55% as tall as the width, radial construction, a 16 inch wheel, load index 91 and speed rating V. Your correct size is on the placard inside the driver’s door jamb.
Used vs new tires
A used tire makes sense when it has plenty of tread, a recent DOT date, no sidewall damage or bad repairs, and matches your size, load index and speed rating. New tires make more sense for full sets on demanding vehicles or when you want the longest possible life.
Tire tread depth
Tread depth is measured in 32nds of an inch. New York State inspection requires at least 2/32 in. If you put a penny upside down in the groove and see all of Lincoln’s head, you are at or below 2/32 in and the tire needs replacing.
When to replace tires
Replace a tire when the tread reaches 2/32 in, when the sidewall has a bulge, deep cracks or a cut, when a puncture is outside the repairable area, or when the tire gets old. Many tire and vehicle makers recommend replacement around 6 to 10 years, regardless of tread.
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