2018 Subaru WRX Premium: Find The Right Tire Size

by Alex Braham 50 views

Hey guys! Are you looking to upgrade or replace the tires on your 2018 Subaru WRX Premium? Knowing the correct tire size is crucial for maintaining your car's performance, safety, and overall driving experience. Let's dive into everything you need to know about the right tire size for your ride.

Understanding the Stock Tire Size

First things first, let's talk about the original tire size that came with your 2018 Subaru WRX Premium. Generally, this model is equipped with 235/45R17 tires. This alphanumeric code might seem like gibberish, but each part has a specific meaning:

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

Sticking with the stock tire size ensures that your speedometer reads accurately, your car handles as the manufacturer intended, and you avoid any potential issues with your car's systems like the ABS or traction control. Plus, using the recommended size prevents rubbing or fitment problems. Why mess with a good thing, right? It’s like ordering the perfect coffee – you know what you want, and you stick with it! However, let's explore why you might consider other options.

Why Consider Alternative Tire Sizes?

Okay, so you know the stock size, but why might you want to deviate from it? There are several reasons:

  • Improved Performance: Different tire sizes and types can offer better grip, handling, or braking performance. For example, a wider tire might provide more contact with the road, enhancing grip during cornering and acceleration.
  • Aesthetic Appeal: Let's be honest, sometimes it's all about the looks! A different tire size, especially when paired with aftermarket wheels, can dramatically change the appearance of your WRX Premium. A more aggressive stance can turn heads and make your car stand out.
  • Specific Driving Needs: If you frequently drive in challenging conditions like snow or off-road, you might want a tire size and type that's better suited for those environments. For instance, a taller sidewall can provide better cushioning on rough terrain, while a narrower tire can cut through snow more effectively.

However, before you rush out to buy a different size, keep in mind that changing tire sizes can have consequences. You might experience changes in ride quality, fuel economy, speedometer accuracy, and even put extra stress on your car's suspension components. Always weigh the pros and cons and do your research before making a decision. It’s like deciding whether to get that extra shot of espresso – the boost might be great, but too much can lead to the jitters!

Plus Sizing and Minus Sizing

If you're thinking about alternative tire sizes, you'll likely come across the terms "plus sizing" and "minus sizing." These are common techniques used to change the overall diameter of your wheel and tire package while keeping it within acceptable limits.

  • Plus Sizing: This involves increasing the wheel diameter while decreasing the tire's aspect ratio. For example, you might go from a 17-inch wheel to an 18-inch wheel and reduce the tire's aspect ratio from 45 to 40. The goal is to maintain the same overall diameter so that your speedometer remains accurate and you avoid any fitment issues. Plus sizing is often done to improve handling and appearance by using lower profile tires, which can reduce sidewall flex during cornering. Imagine upgrading your shoes for better performance – plus sizing is like that for your car!
  • Minus Sizing: This involves decreasing the wheel diameter while increasing the tire's aspect ratio. For example, you might go from a 17-inch wheel to a 16-inch wheel and increase the tire's aspect ratio from 45 to 50 or 55. Minus sizing is often done to improve ride quality and traction in snow or other challenging conditions. The taller sidewall provides more cushioning and can help the tire conform to uneven surfaces. Think of it as swapping your sports car tires for something more comfortable and practical during the winter months.

When considering plus or minus sizing, it's essential to use a tire size calculator to determine the correct tire size that will maintain the same overall diameter as your stock tires. This will help you avoid any speedometer errors or fitment problems. Websites like Tire Rack and Discount Tire offer handy calculators that can help you with this.

Considerations for the 2018 Subaru WRX Premium

Now, let’s get specific about your 2018 Subaru WRX Premium. Here are some things to keep in mind when choosing a tire size:

  • Clearance: Ensure that the tires you choose have adequate clearance from the suspension components, fenders, and brake calipers. Rubbing can cause damage to your tires and car, so it’s essential to get this right. Always double-check the clearances, especially when turning the steering wheel fully from lock to lock.
  • Wheel Offset: The wheel offset plays a crucial role in determining how the wheel and tire fit within the wheel well. A different offset can change the tire's position relative to the suspension and fenders, potentially causing rubbing or other fitment issues. Be sure to choose wheels with the correct offset for your WRX Premium.
  • Load Rating and Speed Rating: Always choose tires with a load rating and speed rating that meet or exceed the manufacturer's recommendations. The load rating indicates the maximum weight that each tire can carry, while the speed rating indicates the maximum speed at which the tire can safely operate. Using tires with inadequate load or speed ratings can be dangerous.
  • Tire Type: Consider the type of driving you do most often. If you primarily drive on the street, you'll want a tire that offers good handling, grip, and ride comfort. If you frequently drive in snow or other challenging conditions, you'll want a tire that's designed for those environments. All-season tires are a good compromise for drivers who experience a variety of weather conditions.

Recommended Alternative Tire Sizes

While sticking to the stock size of 235/45R17 is generally the safest bet, here are a few alternative sizes that some WRX owners have used successfully:

  • 225/45R17: This size is slightly narrower than the stock size and can offer improved handling and steering response. It's a good option if you're looking for a more nimble feel.
  • 245/40R17: This size is slightly wider than the stock size and can provide improved grip and cornering performance. However, be sure to check clearances to ensure that there's no rubbing.
  • 235/40R18: This is a popular plus-size option that combines an 18-inch wheel with a lower profile tire. It can improve handling and appearance, but it may also result in a slightly harsher ride.

Before making any changes, it's always a good idea to consult with a tire professional or do some research on WRX forums to see what other owners have tried. They can provide valuable insights and help you avoid any potential problems.

Where to Buy Tires

Ready to buy some new tires? Here are a few popular places to shop:

  • Local Tire Shops: Supporting your local tire shop is a great way to get personalized service and expert advice. They can help you choose the right tires for your needs and install them properly.
  • Online Retailers: Websites like Tire Rack, Discount Tire, and Amazon offer a wide selection of tires at competitive prices. You can often find great deals and have the tires shipped directly to your home or a local installer.
  • Car Dealerships: Your local Subaru dealership can also sell tires, but they may not always offer the best prices. However, they can ensure that you're getting tires that are specifically designed for your WRX Premium.

Final Thoughts

Choosing the right tire size for your 2018 Subaru WRX Premium is essential for maintaining its performance, safety, and appearance. While sticking with the stock size is generally the safest bet, there are several reasons why you might want to consider alternative sizes. Just be sure to do your research, consider the potential consequences, and consult with a tire professional before making any changes. Happy driving!