Tires are one of the most critical components of your vehicle, but they’re often overlooked until a serious issue arises. Your car’s tires are responsible for providing traction, absorbing shock, and ensuring a smooth ride. However, tires wear down over time and need replacement to keep your car operating safely. But how do you know when it’s time for a change?
In this article, we’ll highlight some common signs that indicate your car may need new tires, according to the Tire and Rubber Manufacturers Association (TRMS).

Tire and Rubber Manufacturers Association (TRMA) Guidelines
The Tire and Rubber Manufacturers Association (TRMA) is a key industry body that represents the tire manufacturing sector, promoting safety, innovation, and responsible tire usage. TRMA offers expert guidelines for both consumers and professionals to ensure tires are maintained in optimal condition for safe driving. Among their many resources, they provide valuable insight into how to recognize when your vehicle’s tires may need replacement.
Here, we’ll break down the key guidelines from TRMA regarding the signs that your car may need new tires. Following these guidelines can help improve safety, prevent accidents, and extend the life of your vehicle.
Tread Wear Indicators
TRMA emphasizes the importance of checking the tread depth of your tires regularly. Tread depth is a critical factor in tire performance, as it directly affects traction, especially in wet or slippery conditions.
- When to Replace: TRMA recommends replacing tires once the tread depth reaches 2/32 of an inch. At this depth, your tires will no longer provide optimal grip and can increase the risk of hydroplaning in wet conditions.
- How to Measure: A simple way to check tread depth is with a tread depth gauge or by the simple penny test. With Lincoln’s head facing down.Insert a penny into the tire’s tread. If the top of his head is visible then it’s time for tire replacement.
Sidewall Damage or Cracks
Over time, exposure to road debris, UV rays, and fluctuating temperatures can lead to sidewall damage. The sidewalls of the tire are essential for supporting the weight of your vehicle and maintaining pressure within the tire.
- What to Look For: Look for visible cuts, cracks, blisters, or bulges on the tire sidewalls. These can compromise the tire’s structural integrity and lead to sudden tire failure.
- When to Replace: If the sidewalls show any signs of significant damage, such as deep cuts, bulges, or cracks, the tire should be replaced immediately. These issues usually cannot be repaired safely and can lead to dangerous blowouts.
Uneven Tire Wear
Uneven tire wear can be a sign of underlying issues with your vehicle, such as misalignment, improper tire pressure, or suspension problems. TRMA highlights that it’s crucial to keep an eye on the overall wear pattern of your tires.
- What to Look For: If you notice that the tread is wearing down unevenly across the tire’s surface, it may indicate issues like misalignment, improper balance, or faulty suspension. For example, if one side of the tire is more worn than the other, it could mean the vehicle’s alignment is off.
- When to Replace: Uneven tire wear generally calls for an assessment by a certified technician. In most cases, replacing the tires with uneven wear is necessary to ensure the vehicle handles safely. Additionally, fixing the underlying issue (e.g., alignment or suspension) is important to prevent new tires from wearing out prematurely.
Vibration While Driving
TRMA notes that an unusual vibration or a rough ride can sometimes be traced back to worn-out tires. If you feel persistent vibrations, particularly at higher speeds, it’s a sign that your tires may need attention.
- Possible Causes: The vibrations could be a result of bald spots, uneven wear, or internal tire damage. This could also indicate a tire imbalance, which can be exacerbated by worn-out or improperly inflated tires.
- When to Replace: If balancing the tires or adjusting the alignment doesn’t resolve the issue, the tires might be too far gone. Tires with internal damage or excessive wear often need to be replaced to prevent further safety hazards.
Frequent Loss of Air Pressure
Tires that frequently lose air pressure or require constant refilling may be showing early signs of failure. TRMA stresses the importance of maintaining proper tire pressure for both safety and tire longevity.
- What to Look For: A sudden or repeated loss of air pressure, despite no visible damage, can indicate internal damage or a slow leak. It can also be a sign of wear in the tire’s seal, valve stem, or bead.
- When to Replace: If the tire cannot maintain proper pressure after repeated repairs or adjustments, it’s time to replace it. Driving on tires with low pressure can significantly reduce their lifespan and increase the risk of tire blowouts.
Age of the Tires
Even if a tire appears to have plenty of tread left, its age is another key factor to consider. TRMA recommends replacing tires that are 10 years or older, regardless of their appearance or tread depth.
- Why It Matters: Over time, the rubber in tires breaks down due to exposure to heat, UV light, and other environmental factors. Even with low mileage, aged tires can become brittle and are more prone to failure.
- When to Replace: Check the tire’s DOT code on the sidewall to determine its age. The last four digits indicate the week and year of manufacture. If your tires are older than 10 years, they should be replaced, even if they still have tread remaining.
Loss of Traction in Wet Conditions
TRMA highlights the importance of traction, particularly in wet weather. If your tires no longer provide reliable grip in rain or snow, it’s time to consider new tires.
- What to Look For: If your car feels slippery or struggles to maintain grip in wet or snowy conditions, your tires may be worn down beyond their useful life. Proper tread depth is essential for clearing water from beneath the tire and maintaining contact with the road surface.
- When to Replace: When tread depth drops to below 4/32 of an inch, your tires’ wet traction performance will be severely compromised. In these cases, replacing your tires with new ones will improve safety, particularly in adverse weather conditions.
FAQs
- How often should I replace my tires?
Tires should generally be replaced every 6 years, but this can vary depending on wear and driving conditions. If the tread is low or you notice any visible damage, it’s best to replace them sooner. - Can I drive with a flat tire?
No, driving with a flat tire can damage the tire and the rim. It can also lead to unsafe driving conditions. Always replace or repair a flat tire before continuing your journey. - How do I know if my tire pressure is correct?
Use a tire pressure gauge to check your tire pressure. The recommended pressure is typically found on the driver’s side door frame or in the owner’s manual.
Explore more related topics:
- Importance of Wheel Alignment
- Car Tire Replacement Tips
- Importance of Regular Car Maintenance
Stay informed and keep your car running smoothly for every mile ahead! Your vehicle will thank you for it!
Author
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Chris May is the founder and owner of May Automotive LLC in Kalamazoo, Michigan. With nearly two decades of OEM-level dealership experience and a degree in Auto/Diesel Applied Sciences, he built his shop on precision, transparency, and high standards. Chris is driven by growth—developing his team, strengthening his business, and delivering reliable, no-nonsense automotive service to the community he serves.