Hey guys! If you're a proud owner or a soon-to-be owner of the iconic 2015 Subaru WRX STI, you're probably itching to know all the nitty-gritty details about its wheels. Knowing the wheel specs is crucial, whether you're planning to upgrade to aftermarket wheels, replace your current set, or just want to understand your car better. This comprehensive guide dives deep into the wheel specifications for the 2015 Subaru WRX STI, ensuring you have all the information you need at your fingertips.

Understanding Wheel Specs

Before we jump into the specifics for the 2015 WRX STI, let's break down what each wheel specification means. This knowledge will help you make informed decisions when it comes to your wheels.

• Diameter: This is the overall size of the wheel, measured from one end to the other through the center. It's usually measured in inches. For example, a 19-inch wheel has a diameter of 19 inches.
• Width: The width of the wheel is the measurement from one inner lip to the other, also usually in inches. This measurement is important because it determines the size of the tire that can be safely mounted on the wheel.
• Bolt Pattern (PCD): The bolt pattern, or Pitch Circle Diameter (PCD), refers to the diameter of the circle formed by the centers of the wheel's bolt holes. It's expressed as the number of bolts and the diameter of this circle (e.g., 5x114.3mm).
• Offset (ET): The offset is the distance from the wheel's mounting surface to its center line. It's measured in millimeters (mm) and can be positive, negative, or zero. The offset affects how the wheel sits in the wheel well and can impact handling and appearance.
• Center Bore: The center bore is the diameter of the hole in the center of the wheel that centers it on the vehicle's hub. It's important that the center bore of the wheel matches the hub size of your vehicle to ensure proper alignment and reduce the risk of vibrations.

2015 Subaru WRX STI Wheel Specs

Okay, let's get down to the main event! The 2015 Subaru WRX STI comes with specific wheel dimensions that you need to know. The factory wheel specs are as follows:

• Diameter: 18 inches
• Width: 8.5 inches
• Bolt Pattern (PCD): 5x114.3mm
• Offset (ET): +55mm
• Center Bore: 56.1mm

Knowing these specs is super important. When you are in the market for new wheels, these numbers act as your guide, ensuring that your new wheels fit perfectly and perform as expected. Getting the right fit is crucial for both safety and performance, so don't skip this step!

Why These Specs Matter

Understanding why each of these specifications matters can save you a lot of headaches down the road. The diameter and width affect the tire size you can use, which in turn impacts your car's handling, ride comfort, and appearance. The bolt pattern is absolutely critical because if it doesn't match, the wheel simply won't fit on your car. The offset determines how the wheel sits in relation to the fender, which can affect both aesthetics and suspension geometry. The center bore ensures the wheel is properly centered on the hub, preventing vibrations and ensuring a smooth ride. All of these specifications are important when it comes to ensuring safety and performance while driving.

Finding Aftermarket Wheels

So, you're thinking about upgrading your wheels? Awesome! The aftermarket is full of options that can enhance the look and performance of your 2015 WRX STI. However, it's important to choose wisely. Here's what to keep in mind:

• Stick to the Specs: As a general rule, it's best to stick as closely as possible to the original wheel specs. This ensures proper fitment and avoids potential issues with clearance or suspension geometry.
• Consider Offset: While you can deviate slightly from the stock offset, it's important to understand the implications. A lower offset will push the wheels further out, giving your car a more aggressive stance. However, too much offset can cause rubbing against the fenders or suspension components. A higher offset will pull the wheels inward, which could cause clearance issues on the inside.
• Check the Center Bore: If the center bore of the aftermarket wheel is larger than the hub size of your car, you'll need to use hub-centric rings to ensure proper centering. These rings fill the gap between the wheel and the hub, preventing vibrations and ensuring a smooth ride.
• Consult with Experts: When in doubt, consult with a wheel and tire specialist. They can help you choose the right wheels for your car and ensure proper fitment.

Popular Aftermarket Wheel Brands

When it comes to aftermarket wheels for the Subaru WRX STI, there are tons of reputable brands to choose from. Some of the most popular include:

• Enkei: Known for their lightweight and durable wheels, Enkei offers a wide range of styles to suit different tastes.
• Volk Racing: These wheels are highly regarded for their quality and performance. Volk Racing wheels are a favorite among enthusiasts.
• Work Wheels: Work Wheels offers a wide range of styles and sizes, with options for both street and track use.
• BBS: BBS wheels are known for their high quality and classic designs. They are a popular choice for those looking for a timeless look.
• Konig: Konig wheels offer a great balance of style and affordability. They are a popular choice for those on a budget.

Tire Considerations

Of course, you can't just think about the wheels! The tires you choose are just as important. When selecting tires for your 2015 WRX STI, keep the following in mind:

• Tire Size: The tire size should be compatible with the width of your wheels. The correct tire size will ensure optimal performance and handling.
• Tire Type: Consider the type of driving you'll be doing. Performance tires offer superior grip and handling in dry conditions, while all-season tires provide a good balance of performance and comfort in all types of weather.
• Tire Pressure: Maintaining the correct tire pressure is essential for safety, handling, and fuel economy. Refer to the sticker on your driver's side doorjamb for the recommended tire pressure for your car.

Recommended Tire Sizes

The 2015 Subaru WRX STI typically uses a tire size of 245/40R18. However, depending on your wheel size and preferences, you may be able to use a slightly different size. Consult with a tire specialist to determine the best tire size for your needs.

Maintaining Your Wheels

Once you've got the perfect set of wheels and tires, it's important to take care of them. Regular maintenance will keep your wheels looking great and performing optimally.

• Cleaning: Clean your wheels regularly with a mild soap and water solution. Avoid using harsh chemicals or abrasive cleaners, as these can damage the finish.
• Inspection: Inspect your wheels regularly for signs of damage, such as cracks, bends, or corrosion. If you notice any damage, have your wheels inspected by a professional.
• Balancing: Have your wheels balanced periodically to ensure a smooth ride and prevent vibrations. Unbalanced wheels can also cause uneven tire wear.
• Alignment: Maintain proper wheel alignment to ensure even tire wear and optimal handling. Misaligned wheels can cause your tires to wear out prematurely and can negatively affect your car's handling.

Conclusion

Choosing the right wheels for your 2015 Subaru WRX STI can be a fun and rewarding experience. By understanding the wheel specs and considering your needs and preferences, you can find a set of wheels that will enhance the look and performance of your car. Remember to always prioritize safety and consult with experts when in doubt. With the right wheels and tires, your WRX STI will be the envy of every car enthusiast on the road!