Choosing the right tire size for your 2018 Subaru WRX Premium is super important for keeping your ride safe, comfy, and performing its best. This article dives deep into everything you need to know about the correct tire sizes, pressures, and all the juicy details to keep your WRX Premium rolling smoothly. Let's get started, guys!

Understanding the Stock Tire Size

Okay, so first things first, let's talk about the original tire size your 2018 WRX Premium came with. Usually, you'll find these details on a sticker inside the driver's side door jamb or in your owner's manual. The standard tire size for the 2018 Subaru WRX Premium is typically 235/45R17. What does all that mean, you ask? Let's break it down:

• 235: This is the tire's section width in millimeters. Basically, it's how wide the tire is from sidewall to sidewall.
• 45: This is the aspect ratio, which tells you the height of the tire's sidewall as a percentage of its width. So, in this case, the sidewall height is 45% of 235 mm.
• R: This indicates that the tire has a radial construction, which is the most common type of tire construction these days.
• 17: This is the wheel diameter in inches. It tells you the size of the wheel that the tire is designed to fit.

Sticking with the stock size ensures that your speedometer reads accurately, your car handles as it was designed to, and you avoid any clearance issues. Plus, it keeps your warranty intact – always a good thing! But hey, sometimes you might want to explore other options, and we'll get into that too.

Why Tire Size Matters

So, why is nailing the right tire size such a big deal? Well, it's not just about aesthetics; it's about getting the most out of your 2018 Subaru WRX Premium. Here’s the lowdown:

• Handling and Performance: Your tires are the only thing connecting your car to the road, so their size and type massively impact handling. The correct size ensures optimal contact with the road, giving you better grip, cornering, and braking performance. Slapping on the wrong size can make your car feel unstable or sluggish.
• Safety: Mismatched or incorrect tire sizes can compromise your car's safety systems, like ABS (Anti-lock Braking System) and ESC (Electronic Stability Control). These systems rely on accurate tire size data to function correctly. Plus, the wrong size could lead to premature tire wear or even a blowout.
• Fuel Efficiency: Believe it or not, tire size can also affect your gas mileage. Larger or wider tires might increase rolling resistance, which means your engine has to work harder to move the car, resulting in lower fuel efficiency. Sticking with the recommended size helps you save money at the pump.
• Ride Comfort: The size of your tires, particularly the sidewall height, influences ride comfort. Tires with taller sidewalls (higher aspect ratio) tend to provide a smoother, more comfortable ride because they absorb bumps and road imperfections better. Conversely, tires with shorter sidewalls (lower aspect ratio) offer a sportier feel but can be harsher on rough roads.
• Aesthetics: Okay, let's be real – looks matter! While performance and safety are paramount, the right tire size can also enhance the appearance of your 2018 Subaru WRX Premium. Some folks like the aggressive look of wider tires, while others prefer the more understated look of the stock size. Just remember to prioritize function over form!

Alternative Tire Sizes: Exploring Your Options

Alright, so you know the stock size, but what if you're thinking about shaking things up a bit? Maybe you want wider tires for a more aggressive stance, or perhaps you're looking for a different aspect ratio for better handling. Here's what you need to consider:

• Plus Sizing: Plus sizing involves increasing the wheel diameter while decreasing the aspect ratio to maintain a similar overall tire diameter. For example, you might go from a 235/45R17 to a 245/40R18. This can improve handling and give your car a sportier look, but it can also make the ride a bit firmer.
• Minus Sizing: Minus sizing is the opposite of plus sizing – you decrease the wheel diameter and increase the aspect ratio. This is often done to improve ride comfort or to use winter tires. For instance, you could go from a 235/45R17 to a 225/50R16. Keep in mind that you need to ensure the smaller wheels clear your brake calipers.
• Width Considerations: Going wider with your tires can improve grip and handling, but it can also introduce rubbing issues, especially if you don't have the right wheel offset. Make sure to check for clearance issues with the suspension components and fender liners. A good rule of thumb is to stay within about 10-20 mm of the stock width.

Before making any changes, it's always a good idea to consult with a tire professional or use an online tire size calculator to ensure that the alternative size is compatible with your 2018 Subaru WRX Premium and won't cause any problems.

Tire Pressure: The Unsung Hero

Okay, guys, let's talk tire pressure! It's super important but often overlooked. Maintaining the correct tire pressure is crucial for safety, fuel efficiency, and tire life. You can usually find the recommended tire pressure for your 2018 Subaru WRX Premium on the same sticker as the tire size information – inside the driver's side door jamb or in your owner's manual.

Typically, the recommended tire pressure is around 32-35 PSI (pounds per square inch) for the front and rear tires. However, this can vary depending on the load you're carrying and your driving conditions. Always check your owner's manual for the most accurate information.

Here are a few tips for maintaining proper tire pressure:

• Check Regularly: Get yourself a good tire pressure gauge and check your tire pressure at least once a month, and before any long trips. Tires lose pressure over time, so regular checks are essential.
• Check When Cold: Always check your tire pressure when the tires are cold, meaning they haven't been driven on for at least a few hours. Driving heats up the tires and increases the pressure, which can give you an inaccurate reading.
• Don't Overinflate or Underinflate: Overinflating your tires can lead to a harsh ride and uneven wear, while underinflating can cause poor handling, reduced fuel efficiency, and increased risk of a blowout. Stick to the recommended pressure.
• Adjust for Load: If you're carrying a heavy load, such as passengers or cargo, you may need to increase your tire pressure slightly. Consult your owner's manual for guidance.

Choosing the Right Tire Type

So, you've got the size down, but what about the type of tire? The right tire type can make a world of difference in terms of performance, handling, and safety. Here are some of the most common types of tires:

• All-Season Tires: These are the most common type of tire and are designed to provide a good balance of performance in various weather conditions, including dry, wet, and light snow. They're a great choice for drivers who experience moderate weather conditions year-round.
• Summer Tires: Summer tires are designed for optimal performance in warm weather conditions. They have a special tread compound that provides excellent grip on dry and wet roads, but they're not suitable for cold weather or snow.
• Winter Tires: Winter tires are specifically designed for cold weather and snowy conditions. They have a special tread pattern and compound that provides superior grip on ice and snow. If you live in an area with harsh winters, winter tires are a must.
• Performance Tires: Performance tires are designed for drivers who want the ultimate in handling and performance. They typically have a stiffer sidewall and a more aggressive tread pattern than all-season tires.

The best tire type for your 2018 Subaru WRX Premium will depend on your driving style, the weather conditions in your area, and your personal preferences. Consider all these factors when making your decision.

Conclusion

Choosing the right tire size and type for your 2018 Subaru WRX Premium is super important for ensuring optimal performance, safety, and comfort. Stick to the recommended size, maintain proper tire pressure, and choose the right tire type for your driving conditions. With a little bit of research and planning, you can keep your WRX Premium rolling smoothly for years to come. Happy driving, folks!