Gavin Howe
While there are no federally mandated safety guidelines on when a tire should be replaced, old tires can be extremely dangerous. Tires degrade with age, and improper maintenance, heat, and UV exposure can accelerate the process. This can lead to blowouts and tread separation, causing a loss of control and rollover crashes. Many carmakers and experts advise replacing tires between five and six years from the manufacturing date, while others suggest a maximum tire life of ten years. Proper storage can help prolong tire life, but it's important to recognize the signs that it's time for a replacement.
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What You'll Learn
There is no federally mandated safety guidance on when to replace tires
Tire aging is influenced by various factors, including heat, storage conditions, underinflation, and typical driving conditions. Heat, in particular, accelerates the aging process, as it causes the oil in the rubber compound to rise out, making the tires turn rock hard. Exposure to sunlight and warm climates can also contribute to faster rubber oxidation and degradation. Tires stored in uncontrolled environments, such as garages or sheds, will break down due to heat exposure.
To maximize tire life, proper storage is essential. Tires should be kept in a cool, dark place to minimize UV exposure and protect them from extreme temperatures. However, even with proper storage, the rubber compound will eventually break down, and old tires may not perform as effectively as new ones.
While there is no federal mandate, safety organizations and automakers recommend replacing tires between five and six years from the manufacturing date. This guideline is based on the increased risk of tread and belt separations in tires older than six years, which can lead to loss of control and rollover crashes. Additionally, manufacturers typically offer warranty periods of four to five years, further emphasizing the importance of timely tire replacement.
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Tires degrade with age, regardless of tread depth
While there is no federally mandated safety guidance on when a tire should be replaced, tires do degrade with age, regardless of tread depth. Like any rubber product, tires will eventually succumb to age. Over time, tires can develop cracks and fissures that can lead to tread separation and loss of vehicle control.
Tire manufacturers and carmakers disagree on the lifespan of a tire. Some vehicle and tire manufacturers recommend replacing tires that are six to ten years old, regardless of treadwear. Automakers such as Ford, Nissan, and Mercedes-Benz suggest replacing tires six years after their production date, irrespective of tread life. However, trade groups like the U.S. Tire Manufacturers Association argue that this five- to six-year guideline is arbitrary and unsupported by data.
The National Highway Traffic Safety Administration (NHTSA) does not provide specific guidelines on tire aging. Instead, they defer to carmakers and tire manufacturers' recommendations. While there is no hard-and-fast rule, many experts advise replacing tires between five and six years from the manufacturing date. This is because, with age, tires become more prone to failure, and the risk of sudden and unexpected tread separation increases.
Factors such as heat, storage conditions, underinflation, and typical driving conditions can accelerate tire aging. For example, tires stored in warm climates, exposed to sunlight, or kept in uncontrolled environments like a garage will age faster. Additionally, spare tires, including those mounted beneath a vehicle or stored inside, are prone to aging due to poor storage conditions and exposure to temperature fluctuations.
To ensure safety, it is essential to regularly inspect tires for tread depth and other signs of wear, such as cracks, bulges, or uneven wear. While the penny test is a common method for checking tread depth, it is only a rough estimate, and a tire tread depth gauge provides a more accurate measurement. Remember, just because a tire has tread remaining does not guarantee its safety.
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Tires should be stored in cool places, away from UV light
There is no federally mandated safety guidance on when a tire should be replaced due to its age. However, several factors can affect a tire's lifespan, including heat, sunlight exposure, and storage conditions.
When storing tires, it is essential to avoid placing them near heat sources or reflective surfaces, such as sand or snow-covered ground. Additionally, avoid keeping them on heat-absorbent surfaces like black asphalt. Keeping tires away from strong artificial light sources is also crucial, as they often emit UV rays.
To ensure tires remain in optimal condition, it is recommended to store them in airtight plastic bags after cleaning and drying them thoroughly. Removing as much air as possible from the bag before sealing it helps reduce oil evaporation from the rubber compounds. While stacking tires, it is advisable to place white parts against each other to prevent staining. If tires are mounted on rims, hanging them or stacking them is preferable. For unmounted tires, storing them standing up is recommended.
By following these storage guidelines, you can help extend the lifespan of your tires and maintain their performance and safety characteristics.
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Spare tires are exposed to poor storage conditions
There is no federally mandated safety guidance on when a tire should be replaced, but many carmakers and experts advise replacing tires between five and six years from the manufacturing date. However, spare tires are often exposed to poor storage conditions, which can shorten their lifespan.
Spare tires mounted beneath a truck or SUV are continuously exposed to road salts, oil, dirt, and temperature fluctuations. Spare tires kept inside a car are baked by the sun and frozen in the winter. Tires stored inflated on a wheel will also succumb to oxidation faster than those stored unmounted.
To maximize the lifespan of a spare tire, it is important to consider the storage conditions. Tires should be stored in a cool, dry location, as heat can cause the oil in the rubber compound to evaporate, making the tire turn rock-hard faster. Extreme temperatures, whether hot or cold, can accelerate tire aging, leading to premature deterioration. Therefore, basements or climate-controlled spaces are preferable to garages, sheds, or attics, which often experience a wide range of temperatures and humidity levels.
Additionally, sunlight exposure can degrade tires, so it is best to keep them out of direct sunlight. Ultraviolet rays can break down the rubber, causing it to become brittle and weak. If necessary, a black trash bag can be used to shield the tire from UV rays.
Other factors that can impact the lifespan of a spare tire include ozone exposure, humidity, and mechanical stress. Tires should be stored away from any ozone-producing equipment, such as electric motors, fluorescent lamps, and generators. Humidity can cause condensation to form on tires, and liquids are potential sources of ozone, which can destroy rubber. Finally, when storing multiple tires, it is best not to stack them, as this can put additional stress on the tires at the bottom.
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Classic cars are more likely to have unsafe tires
There is no federally mandated safety guidance on when a tire should be replaced. However, many carmakers and experts advise replacing tires between five and six years from the manufacturing date. This is because tires degrade with age, and old tires can develop cracks and fissures that can lead to tread separation and loss of car control.
Classic car tires have a uniquely shaped carcass, resulting in a smaller contact patch with the pavement. A thinner patch of rubber on the ground isn't ideal for traction, but it does make the car easier to turn. The rounded carcass of a classic car tire also rolls over differently in hard cornering, resulting in handling that is more akin to what the automaker originally intended.
Classic car tires are also much skinnier than modern tires. While these tires are strong, they lack the flexibility of modern radial tires and have a smaller surface area of rubber gripping the road. Radial tires first became popular in the 1960s, and by the 1970s, practically every new car in America was equipped with them.
Classic car enthusiasts now have a lot more tire choices than they did a decade ago. Several tire manufacturers offer classic lines, including modern-construction tires designed for cars from the mid-1970s or earlier that have an authentic appearance but are radials. However, modern radial tires degrade the vehicle's authenticity, and some enthusiasts consider them sacrilegious.
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Frequently asked questions
There is no federally mandated safety guidance on when a tire should be replaced. However, state and federal regulations do require that tires be marked with a Tire Identification Number, which includes the week and year of manufacture.
Locate the four-digit number after the visible DOT (Department of Transportation) designation on the sidewall of a tire. For example, a DOT number of 0820 would mean the tire was made on the 8th week of 2020.
There is no hard-and-fast rule, but many carmakers and experts advise replacement between five and six years from the manufacturing date. Tires older than six years have been identified to experience tread and belt separations, leading to loss of control and rollover crashes.
