Finding the correct tire size for your vehicle is a fundamental part of maintenance and safety. If you’re asking “what size tires fit my car,” the most accurate answer is already with your vehicle. Tires that are the correct size for your vehicle are listed on the placard inside your driver’s side door jamb.
This guide will walk you through every method to find your tire size, explain what those numbers mean, and help you understand your options for replacement.
What Size Tires Fit My Car
The definitive source for your car’s original tire size is the tire information placard. This is a metal or sticker label placed on your vehicle by the manufacturer. It lists the exact tire size, load capacity, and recommended inflation pressure.
You will typically find it in one of these locations:
- Inside the driver’s side door jamb (the most common spot).
- Inside the fuel filler door.
- Inside the glove compartment door.
- In the trunk, near the spare tire well.
If the placard is missing or unreadable, don’t worry. There are several other reliable ways to find your tire size.
How To Read Your Current Tire Sidewall
Your current tires have the size molded directly into their sidewalls. Look for a sequence of numbers and letters that looks something like this: P215/65R16 95H.
This code is standardized and tells you everything about the tire’s dimensions and capabilities. Let’s break down what each part means.
Understanding Tire Size Notation
Using our example of P215/65R16 95H, here is the step-by-step breakdown:
- P (Tire Type): Stands for “P-metric,” meaning it’s for passenger vehicles. You might also see “LT” for Light Truck, “ST” for Special Trailer, or no letter (a Euro-metric tire).
- 215 (Section Width): This is the tire’s width in millimeters from sidewall to sidewall when mounted and inflated.
- 65 (Aspect Ratio): This is the sidewall height, expressed as a percentage of the section width. So, 65 means the sidewall height is 65% of 215mm.
- R (Construction): Indicates “Radial,” which is the standard construction for almost all modern tires. You may rarely see “D” for diagonal (bias-ply).
- 16 (Wheel Diameter): The diameter of the wheel rim that the tire is designed to fit, measured in inches.
- 95 (Load Index): A numerical code that corresponds to the maximum weight the tire can support. A load index of 95 supports 1,521 pounds per tire.
- H (Speed Rating): A letter indicating the maximum speed the tire can sustain under its load rating. “H” means up to 130 mph.
Other Reliable Sources For Your Tire Size
Besides the door jamb and the tire sidewall, you can consult these sources:
- Your Vehicle’s Owner’s Manual: The manual always lists the original equipment (OE) tire specifications.
- Your Spare Tire: If you have a full-size spare, check its sidewall. Even a temporary spare will have its unique size listed.
- Reputable Online Tools: Many tire manufacturer and retailer websites have fitment guides. You enter your vehicle’s year, make, and model to get the correct tire sizes.
Can You Put Different Size Tires On Your Car
While it’s crucial to use the size specified by the manufacturer, you do have some flexibility. Changing tire sizes is common for performance, looks, or off-road capability. However, it must be done carefully to avoid problems with your speedometer, odometer, anti-lock brakes (ABS), and traction control systems.
The key concept is overall tire diameter. You want any new tire size to have a overall diameter as close as possible to your original tires.
Plus-Sizing Your Wheels And Tires
Plus-sizing is a popular way to enhance a vehicle’s appearance and handling. You increase the wheel rim diameter while decreasing the tire’s aspect ratio to maintain the overall diameter.
For example, you might move from a standard 215/65R16 to a plus-sized 235/55R17. The wheel gets one inch larger, but the shorter sidewall keeps the total height similar.
Benefits of plus-sizing include:
- Improved cornering stability and steering response.
- A more attractive, sportier appearance.
Potential drawbacks include:
- A firmer ride due to less sidewall flex.
- Wheels are more susceptible to damage from potholes.
- Tires are often more expensive.
Important Considerations For Tire Size Changes
Before deciding on a different tire size, you must check several things:
- Clearance: Will the new tire rub against the wheel well, suspension, or brake components when turning or over bumps?
- Load and Speed Ratings: The new tire must meet or exceed the load index and speed rating of the original tire.
- Manufacturer Recommendations: Check your owner’s manual for any approved alternate tire sizes.
- Professional Advice: Always consult with a qualified tire professional. They can ensure the new size is safe and appropriate for your specific vehicle.
Step-By-Step Guide To Finding Your Correct Tire Size
Follow this simple process to confidently determine what size tires fit your car.
Step 1: Locate And Read Your Door Jamb Placard
Open your driver’s side door and look at the area where the door latches to the car body. Find the sticker or metal plate with tire information. Write down the full tire size code listed.
Step 2: Verify The Size On Your Current Tires
Go to one of your car’s tires and find the raised lettering on the sidewall. Locate the code that matches the format described earlier (e.g., P215/65R16). Compare it to the door jamb placard. They should match if the tires are original equipment.
Step 3: Consult Your Owner’s Manual
Look in the index of your owner’s manual for “Tires” or “Tire Information.” This section will confirm the size and may list optional sizes for different trim levels or driving conditions.
Step 4: Use An Online Fitment Guide
As a final check, visit the website of a major tire brand or retailer. Use their vehicle lookup tool. Enter your car’s year, make, model, and trim level. The results should align with the size you’ve already found.
Step 5: Consider Your Driving Needs
Once you know the correct size, think about the type of tire that suits your driving. Options include all-season, summer, winter, and all-terrain tires. All are made in your size, but they perform very differently.
The Consequences Of Using The Wrong Tire Size
Installing tires that are not the correct size for your vehicle can lead to serious issues. It’s not just about fit; it’s about the entire vehicle’s function and your safety.
Safety And Performance Risks
Incorrect tire sizes can create multiple hazards:
- Faulty Speedometer Readings: A larger overall diameter makes your speedometer read slower than you are actually going. A smaller diameter makes it read faster. This can lead to speeding tickets or unsafe driving.
- Strained Drivetrain: Significant size differences can put extra stress on the transmission, differential, and wheel bearings, leading to premature wear.
- Compromised Safety Systems: Modern stability control, traction control, and anti-lock brake systems are calibrated for a specific tire size. The wrong size can cause these systems to malfunction.
- Poor Handling and Braking: The vehicle’s handling balance and braking distances can be negatively affected.
Legal And Warranty Implications
Using a tire size not approved by the vehicle manufacturer could void aspects of your car’s warranty, especially if a failure can be linked to the tire change. In some regions, it may also make your vehicle fail its mandatory safety inspection or even be considered unroadworthy.
Frequently Asked Questions
Where Is The Tire Size Located On A Car?
The primary location is on the tire information placard inside the driver’s side door jamb. You can also find it molded into the sidewall of your current tires, in your owner’s manual, and sometimes inside the fuel door or glove box.
Can I Use A Tire Size That Is Different From My Door Placard?
You can, but it requires careful calculation to maintain a similar overall diameter. It is essential to consider clearance, load ratings, and the effect on your vehicle’s electronic systems. Consulting a tire expert is strongly recommended before making a change.
Do All Four Tires Have To Be The Exact Same Size?
For all modern passenger cars, SUVs, and light trucks with standard drivetrains, yes, all four tires should be the same size, brand, model, and tread depth. This is critical for proper operation of the drivetrain and electronic stability systems. Some high-performance all-wheel-drive vehicles are especially sensitive to even small differences in tire diameter.
How Do I Find My Tire Size Without The Sticker?
If the door jamb placard is missing, first check the sidewall of your current tires. If the tires are not original, look in your vehicle’s owner’s manual. You can also use an online tire fitment guide by entering your vehicle details, or contact a dealership parts department with your Vehicle Identification Number (VIN).
What Happens If I Put Bigger Tires On My Car?
Putting significantly bigger tires on your car can cause them to rub against the wheel wells or suspension, leading to damage. It will also make your speedometer show a speed lower than your actual speed, can reduce acceleration due to added weight and gearing changes, and may lower fuel economy. Any change should be within a few percent of the original overall diameter.