If they're in bad shape, the car's ability to accelerate, stop, and turn in all conditions is greatly compromised.
Everybody knows to replace tires when the tread gets down to the wear bar, but what about when they get too old? The rubber in tires deteriorates over time due to UV and environmental exposure. The resulting "dry rot" leaves tire structure brittle and leads to sidewall damage and eventual failure. This isn't "Oh I'll just fill it up and drive on it. As a precaution, the Department of Transportation recommends changing even new-looking tires once they hit 10 years old, and many manufacturers recommend swapping them out at six years old.
Of course, this aging is highly dependent on where the tires live. Tires in hot dry climates have much shorter lives than those in moderate, moist climates. Still, you want to maximize tire life when buying a new set of rubber. Since tires can sit in a warehouse for years, you'll want to know when the tires were made, rather than purchased, and there's an easy way to tell. Every tire has a "born-on date" molded into the sidewall and coded according to federal requirements.
Near the edge of the rim, look for a long serial number starting with the letters "DOT.
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If you find your "new" tires are more than two years old, feel free to request a newer manufacture date or a discount from the salesman. The customer is always right, after all. Start on. Show related SlideShares at end. WordPress Shortcode. Sam Thai Aladeen , Working Follow. Full Name Comment goes here. Are you sure you want to Yes No.
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Actions Shares. Embeds 0 No embeds. No notes for slide. This includes information about the tire's basic characteristics, capacities and construction, as well as its U. Current regulations require that Tire Identification Numbers begin with the letters "DOT," followed by ten, eleven or twelve characters see photo below that can be used to identify the manufacturing location, tire size and manufacturer's specifications, along with the week and year the tire was manufactured.
So while DOT Tire identification Numbers are commonly but erroneously referred to as the tire's serial number, unlike the serial numbers used on most other consumer goods that identify one specific item, Tire Identification Numbers actually identify production batches. Regulations also require the entire DOT Tire Identification Number to be branded on one sidewall while only the letters "DOT" and the first digits of the Tire Identification Number must be branded onto the opposite sidewall shown below.
Therefore it is possible to see a Tire Identification Number that appears incomplete, yet simply requires looking at the tire's other sidewall to find the complete Tire Identification 2. Because not all tires are intended to be imported and sold in the United States, many tires are developed and produced without being tested by their manufacturer to confirm they meet all U. Without conducting the tests and certifying these tires meet U. The DOT tire identification number indicates compliance with all safety standards established by the U.
Department of Transportation and provides additional information about the tire manufacturer.
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Located on the sidewall of a tire, the complete DOT tire identification number is a combination of up to 12 numbers and letters that provide valuable information. The first two are the plant code where the tire was manufactured, and the last three to four numbers represent the week and year the tire was built.