Tire Maintenance: What Every Driver Should Know

Tires are one of the most overlooked parts of vehicle maintenance, yet they're arguably the most important. They're the only thing connecting your vehicle to the road. Every braking force, every steering input, every acceleration you make is transmitted through four small contact patches — roughly the size of a hand each — between rubber and pavement. Keeping your tires in good condition isn't just about saving money; it's a direct safety issue.

Check Tire Pressure Regularly

Tire pressure is the single most impactful thing you can do for your tires — and it takes about three minutes. Tires naturally lose one to three PSI (pounds per square inch) per month just through permeation, and temperature changes have a significant effect too. Tire pressure drops approximately one PSI for every 10°F drop in ambient temperature.

The correct tire pressure for your vehicle is listed on a sticker inside the driver's door jamb — not on the sidewall of the tire itself (that number is the maximum the tire can hold, not the recommended operating pressure). Check pressure when the tires are cold — before you've driven more than a mile or two — for the most accurate reading.

Underinflation causes increased rolling resistance (reducing fuel economy), excessive heat buildup (accelerating wear and increasing blowout risk), and poor handling. Overinflation reduces the contact patch with the road, which compromises grip and causes the center of the tread to wear faster than the edges.

Most passenger vehicles run between 30 and 36 PSI. Check monthly, and always before long road trips.

Understand Tire Tread Depth

Tread depth determines how well your tires channel water away from the contact patch to maintain grip on wet roads. New tires typically have 10/32" to 11/32" of tread depth. Legal minimums in most US states and Canadian provinces are 2/32", but many safety experts recommend replacing tires at 4/32" for wet conditions and 6/32" for winter driving.

The easiest way to check tread depth is the penny test: insert a penny into a tread groove with Lincoln's head pointing down. If you can see the top of Lincoln's head, the tread is below 2/32" and the tire needs replacement immediately. The quarter test (using Washington's head) gives you a warning at 4/32".

For a more precise reading, an inexpensive tread depth gauge is available at any auto parts store for a few dollars.

Rotate Your Tires

Front and rear tires wear at different rates. Front tires on front-wheel-drive vehicles carry most of the vehicle's weight and handling burden and wear significantly faster than rears. Without rotation, you end up replacing fronts twice as often as rears, and you miss out on the mileage potential of the rear tires.

Most manufacturers recommend rotating tires every 5,000 to 7,500 miles — often aligned with oil changes for convenience. A tire rotation typically costs $20 to $50 and can add thousands of miles to your tire life. Many shops and tire retailers include rotations free with tire purchase.

Get a Wheel Alignment

Alignment refers to the angles at which your tires contact the road — camber (tilt in/out), toe (angled in/out like pigeon-toed), and caster (front-to-back angle). These angles are precisely calibrated at the factory and can be knocked out of spec by potholes, curb strikes, or general road impact.

Signs of misalignment include the vehicle pulling to one side, uneven tread wear (one edge wearing faster than the other), or the steering wheel not centering after a turn. Misalignment causes rapid, uneven tire wear and affects handling.

A wheel alignment should be done whenever you replace tires, after hitting a significant pothole or curb, and roughly every year as preventive maintenance. It typically costs $75 to $100 and can save you hundreds in premature tire replacement.

Balance Your Wheels

Wheel balancing corrects for minor weight imbalances in the tire/wheel assembly. Even small imbalances become significant at highway speeds and cause vibration in the steering wheel, seat, or floor. Balancing involves mounting the wheel on a spin balancer and attaching small weights to correct any imbalance detected.

Tires should be balanced when first mounted and whenever you notice vibration. It's often done as part of a tire rotation.

Know When to Replace

Beyond tread depth, replace tires if you notice:

• Cracking or dry rot in the sidewall — UV exposure and aging degrade rubber even if the tread looks okay
• Bulges or bubbles on the sidewall — internal structural damage, potentially dangerous
• Exposed cords or fabric showing through worn tread
• Persistent vibration after balancing has been done

Also: tires have an age limit regardless of appearance. Most manufacturers recommend replacing tires after six years and consider ten years absolute maximum, even if tread depth looks acceptable. Check the DOT code on the sidewall — the last four digits indicate the week and year of manufacture (e.g., 2423 means the 24th week of 2023).

Your tires are inexpensive relative to the safety margin they provide. Stay on top of pressure, rotation, and inspection, and they'll serve you well — and stop you safely when it counts.