Introduction
Your tires are the only part of your vehicle that actually touches the road — yet they’re one of the most overlooked aspects of car maintenance. Whether you’re a new driver or a seasoned one, understanding the basics of tire care can save you money, improve your safety, and extend the life of your vehicle. At McCarthy Auto Group, we believe every driver deserves straightforward, honest answers when it comes to caring for their car. That’s why we put together this simple tire FAQ to help you feel confident every time you hit the road.
Tire Measurements
Have you ever noticed the series of numbers and letters stamped into the sidewall of your tire? Those are your tire’s measurements and specifications — and understanding them is essential when it’s time to select the right tire for your vehicle’s rim. You can find your factory tire and rim specs in your owner’s manual or on the doorjamb sticker on the driver’s side door.
Let’s break down a common measurement you’d find on a tire for a 2022 Hyundai Sonata SE:
P205/65R16 95H
Vehicle Class — P
This optional prefix indicates the vehicle type the tire is designed for. “P” stands for “passenger vehicle.” Many tires won’t include this letter at all.
(Note: Larger SUVs and trucks may be classified as “LT” or “light truck” and follow a slightly different sizing system.)
Width — 205
This three-digit number represents the tire’s overall width, measured in millimeters.
Aspect Ratio — 65
This figure reflects the sidewall height as a percentage of the tire’s width — meaning the sidewall height is 65% of the total width.
Construction — R
This letter describes the tire’s internal construction. “R” stands for “radial,” which is the standard for nearly all passenger vehicles on the road today.
Rim Diameter — 16
This number tells you the wheel size the tire is designed to fit — in this case, a 16-inch rim.
Load Index — 95
This number reflects how much weight each tire can safely support. A load index of 95 means the tire can carry up to 1,521 lbs.
Speed Rating — H
This letter indicates the tire’s maximum rated speed. An “H” rating means the tire is approved for speeds up to 130 mph.
Common Tire FAQs
When should I replace my tires?
Most tires last somewhere between 25,000 and 50,000 miles, though that range can shift depending on your driving habits, road conditions, and tire type. A simple way to check is the penny test: place a penny into the tread groove with Lincoln’s head pointing down. If the top of his head is visible, it’s time to start shopping for new tires.
How often should I rotate my tires?
Most manufacturers recommend rotating your tires every 5,000 to 7,500 miles — or roughly every oil change. Consistent rotation promotes even tread wear across all four tires and helps extend their overall life.
What’s the correct tire pressure for my vehicle?
Check your owner’s manual or the sticker on the driver’s side doorjamb — not the sidewall of the tire itself. The number printed on the tire is the maximum allowable pressure, not the recommended level. Most passenger cars call for somewhere between 30 and 35 PSI.
Can I mix different tire brands or types?
In most cases, it’s best to avoid it. Running mismatched tires can negatively impact handling, traction, and overall safety. For optimal performance, it’s ideal to keep the same brand, model, and size on all four wheels — or at the very least, match tires on the same axle.
What happens if I drive on underinflated tires?
Driving on underinflated tires puts extra stress on the rubber, reduces fuel efficiency, causes uneven wear, and can seriously affect your handling and braking. In the worst cases, it can lead to a sudden blowout. Make it a habit to check your tire pressure at least once a month and always before a long road trip.
Do I need to balance my tires?
Yes, and it’s more important than many drivers realize. Tire balancing ensures the weight is evenly distributed around the entire wheel and tire assembly. When tires are out of balance, you may notice vibration in the steering wheel or seat, uneven wear patterns, and added strain on your suspension components. Tires should be balanced whenever they’re mounted, rotated, or if you begin to feel unusual vibration while driving.
What is the difference between all-season and winter tires?
All-season tires are built to handle a wide range of conditions — light rain, mild temperatures, and even a dusting of snow. Winter tires, on the other hand, are specifically engineered for cold climates, using a softer rubber compound that stays flexible in freezing temperatures and deeper, more aggressive tread patterns for better grip on ice and heavy snow. If you live somewhere with serious winters, a dedicated set of winter tires is well worth the investment.
Conclusion
Tires might not be the most exciting part of owning a car, but they’re absolutely one of the most critical. Staying on top of tire pressure, rotation, balancing, and tread depth keeps you safer on the road and can save you from costly repairs down the line. If you have questions about your tires or it’s time for a checkup, the service team at McCarthy Auto Group is here to help. Schedule a service appointment today, find a service location near you, or browse our current specials to see if there’s a deal waiting for you. We’re proud to serve drivers across the area and look forward to keeping you moving safely.
