What Are the 2018 Subaru WRX STI Tire Sizes and Options?

2018 Subaru WRX STI Tire Size Overview

The 2018 Subaru WRX STI is a performance-oriented sedan that has carved out a niche for itself among car enthusiasts. One of the critical components that contribute to its handling and performance is the tire size. Understanding the stock tire sizes for different trims can help you make informed decisions about replacements, upgrades, or simply maintaining your ride. Here’s a detailed look at the tire sizes for the 2018 WRX STI across its various trims.

Stock Tire Sizes by Trim

The 2018 WRX STI comes in several trims, each with specific tire size requirements. Here’s a breakdown:

Trim Level	Front Tire Size	Rear Tire Size	Tire Specifications
WRX STI Base	255/35R18	255/35R18	Performance Summer Tires
WRX STI Limited	255/35R18	255/35R18	Performance Summer Tires
WRX STI Type RA	255/35R18	255/35R18	Performance Summer Tires

Understanding Tire Size Notation

The tire size notation can seem confusing, but it’s straightforward once you break it down:

• 255 – This number represents the width of the tire in millimeters. A wider tire generally provides better grip.
• 35 – This is the aspect ratio, which shows the height of the sidewall as a percentage of the tire’s width. A lower number indicates a shorter sidewall, which can enhance handling.
• R18 – The ‘R’ stands for radial construction, and ’18’ is the diameter of the wheel in inches. Make sure you have the right size wheels to fit these tires.

Performance Considerations

Choosing the right tire size is crucial for performance. The stock sizes for the WRX STI are designed to optimize handling, grip, and ride comfort. Here are some performance-related points to consider:

• Wider tires (like the 255mm width) provide better traction, especially during cornering.
• The low-profile design (35 aspect ratio) enhances steering responsiveness but can lead to a harsher ride on rough roads.
• Summer tires offer superior grip in warm weather but may not perform well in cold or wet conditions.

Replacement and Upgrades

If you’re considering replacing your tires or upgrading to a different size, keep in mind:

• Sticking to the stock size ensures compatibility with your vehicle’s handling characteristics.
• Consult with a tire specialist if you’re thinking of changing sizes to avoid issues like rubbing or incorrect speedometer readings.
• Always consider the type of driving you do. Performance tires are great for spirited driving but may wear faster.

Understanding the tire sizes for the 2018 Subaru WRX STI is essential for maintaining its performance and safety. Whether you’re replacing worn-out tires or looking to upgrade, knowing your options can make a significant difference in your driving experience.

Exploring the Smallest and Biggest Tire Sizes for the 2018 Subaru WRX STI

When it comes to the 2018 Subaru WRX STI, tire size plays a pivotal role in how the car performs on the road. While the stock tire size is 255/35R18, some enthusiasts explore different sizes for various reasons, including performance, comfort, and aesthetics. Let’s dive into the smallest and biggest tire sizes that WRX STI owners have experimented with, along with feedback from forums and owner experiences.

Smallest Tire Sizes

While the stock size is already on the lower end of the spectrum for performance tires, some owners have opted for smaller sizes. The smallest commonly discussed tire size for the WRX STI is 245/40R18. Here’s what you need to know:

Pros of Smaller Tires

• Improved Comfort: Smaller tires can provide a more comfortable ride due to a taller sidewall, which absorbs road imperfections better.
• Cost-Effective: Generally, smaller tires can be less expensive, making them a budget-friendly option for replacements.
• Better Wet Performance: Some owners report improved wet traction with a slightly taller sidewall, which can enhance grip in rainy conditions.

Cons of Smaller Tires

• Reduced Handling: A smaller tire can lead to less precise steering and reduced cornering stability, which is crucial for a performance car like the STI.
• Speedometer Issues: Changing to a smaller tire size can affect your speedometer accuracy, leading to potential legal issues.
• Rubbing Issues: Depending on the offset and suspension setup, smaller tires may rub against the fenders, especially during aggressive cornering.

Biggest Tire Sizes

On the flip side, some owners look to increase the tire size for a more aggressive stance and improved performance. The largest tire size reported for the 2018 WRX STI is 275/35R18. Here’s a breakdown of what to expect:

Pros of Larger Tires

• Enhanced Grip: A wider tire generally provides better grip during acceleration and cornering, which is a significant advantage for performance driving.
• Aggressive Look: Many enthusiasts prefer the wider, more aggressive appearance that larger tires provide, enhancing the vehicle’s overall aesthetic.
• Increased Contact Patch: A larger tire has a bigger contact patch with the road, which can improve braking performance.

Cons of Larger Tires

• Ride Quality: Larger tires can lead to a harsher ride due to the lower sidewall height, which may transmit more road noise and vibrations into the cabin.
• Weight Considerations: Bigger tires can add weight, which may slightly impact acceleration and fuel efficiency.
• Potential for Rubbing: Depending on the suspension setup, larger tires may rub against the fenders or suspension components, especially during turns or when the suspension compresses.

Best Tires According to Owner Feedback

Based on discussions from various automotive forums and owner feedback, several tire options stand out for the 2018 WRX STI. Here’s a summary of the most recommended tires:

Tire Brand	Tire Model	Size	Owner Feedback
Michelin	Pilot Sport 4S	255/35R18	Exceptional grip, especially in dry conditions, and a comfortable ride.
Bridgestone	Potenza RE-71R	255/35R18	Great for track use, outstanding cornering stability, but wears quickly.
Continental	ExtremeContact Sport	255/35R18	Well-balanced performance in both wet and dry conditions, long-lasting.
Goodyear	Eagle F1 Supercar 3	275/35R18	Excellent grip and handling, but may sacrifice ride comfort.

Final Thoughts on Tire Sizes

When it comes to the 2018 Subaru WRX STI, the choice of tire size can significantly affect your driving experience. Whether you’re considering smaller tires for comfort or larger ones for performance, it’s essential to weigh the pros and cons carefully. Always consult with a tire specialist if you’re unsure about compatibility or performance implications. Your tires are the only contact between your car and the road, so make sure you choose wisely.