For the 2015 Subaru WRX, the standard factory wheel specifications include a 5x114.3mm bolt pattern, a +55mm offset, and a 56.1mm center bore. Depending on the trim level, the vehicle came equipped with either 17x8-inch or 18x8.5-inch wheels, utilizing M12x1.25 lug nuts torqued to approximately 89 lb-ft.
The 2015 model year represented a pivotal moment for the Subaru WRX. As the debut of the VA chassis, it marked the first time the WRX moved away from the 5x100mm bolt pattern used in previous generations, adopting the sturdier 5x114.3mm layout previously reserved for the WRX STI. As of 2026, this chassis remains one of the most popular platforms for aftermarket wheel modifications, making a precise understanding of OEM specifications essential for maintaining safety, handling performance, and aesthetic appeal.
The Significance of the 2015 Model Year Transition
Before diving into the granular measurements, it is vital to understand why the 2015 Subaru WRX wheel specs are distinct from its predecessors. From 2002 through 2014, the WRX utilized a 5x100mm bolt pattern. When Subaru launched the 2015 model, they standardized the hub assembly across both the WRX and the STI to the 5x114.3mm (5x4.5 inch) pattern.
This change was not merely aesthetic; the larger bolt pattern allows for larger wheel bearings and a more robust hub assembly, which directly translates to better heat dissipation and improved rigidity under high cornering loads. For owners in 2026 looking to source used or "take-off" wheels, this means that wheels from a 2014 WRX will not fit a 2015 model, whereas wheels from many 2005β2021 STIs are technically compatible regarding the bolt pattern.
Factory OEM Wheel Specifications by Trim
Subaru offered the 2015 WRX in three primary trims: Base, Premium, and Limited. The wheel specifications vary slightly between these models, primarily in diameter and aesthetic finish.
2015 WRX Base Trim
The Base trim was equipped with a functional, lightweight 17-inch alloy wheel. These wheels were designed to balance ride comfort with the "Subaru Intelligent Drive" (SI-DRIVE) capabilities of the vehicle.
- Wheel Size: 17 x 8.0 inches
- Offset: +55mm
- Construction: Cast Aluminum Alloy
- Color: Gunmetal Grey / Dark Silver
2015 WRX Premium and Limited Trims
The higher trim levels received an upgrade in wheel diameter, which allowed for a lower-profile tire and a more aggressive stance.
- Wheel Size: 18 x 8.5 inches
- Offset: +55mm
- Construction: Cast Aluminum Alloy
- Color: High-luster Gunmetal
Summary Table of 2015 Subaru WRX Wheel Specs
| Specification | 17-Inch (Base) | 18-Inch (Premium/Limited) |
|---|---|---|
| Bolt Pattern | 5 x 114.3mm | 5 x 114.3mm |
| Wheel Diameter | 17 Inches | 18 Inches |
| Wheel Width | 8.0 Inches | 8.5 Inches |
| Offset | +55mm | +55mm |
| Center Bore | 56.1mm | 56.1mm |
| Lug Nut Thread | M12 x 1.25 | M12 x 1.25 |
| Stock Tire Size | 235/45R17 | 245/40R18 |
| Torque Spec | 89 lb-ft (120 Nm) | 89 lb-ft (120 Nm) |
Deep Dive into Critical Measurements
Bolt Pattern (PCD)
The Pitch Circle Diameter (PCD) of 5x114.3mm refers to five lug holes arranged on a circle with a diameter of 114.3mm. This is one of the most common bolt patterns in the automotive industry, shared by manufacturers like Mitsubishi, Nissan, and Toyota. This provides 2015 WRX owners with a massive selection of aftermarket options compared to the older 5x100 chassis.
Offset (ET)
The factory offset is +55mm. Offset is the distance from the wheel's mounting surface to its true centerline. A positive offset of +55mm means the mounting surface is tucked deep toward the street side, pulling the wheel inward toward the suspension.
When modifying the 2015 WRX, many owners opt for a lower offset (such as +35mm or +38mm). This pushes the wheels outward, creating a "flush" look with the fender. However, deviating too far from the +55mm factory spec can increase the load on wheel bearings and alter the scrub radius, which may lead to "tramlining"βthe tendency of the car to follow cracks or ruts in the road.
Center Bore and Hub-Centricity
The center bore is the 56.1mm hole in the middle of the wheel that fits over the hub's pilot. Subaru uses a hub-centric design, meaning the hub carries the weight of the vehicle, while the lug nuts simply secure the wheel to the hub.
Most aftermarket wheels have a larger center bore (e.g., 73.1mm) to fit a variety of vehicles. If you install aftermarket wheels on a 2015 WRX, you must use hub-centric rings (56.1mm inner diameter to [Wheel Bore] outer diameter). Failure to do so can result in high-speed vibrations, as the wheel may not be perfectly centered on the hub.
Hardware and Installation Requirements
Lug Nuts and Thread Pitch
The 2015 WRX uses M12 x 1.25 lug nuts. The "M12" refers to the 12mm diameter of the stud, and "1.25" refers to the thread pitch (distance between threads in millimeters).
It is important to note the seat type of the lug nut:
- OEM Wheels: Typically use a "tapered" or "conical" seat.
- Aftermarket Wheels: Almost exclusively use a 60-degree conical seat.
- Warning: Never use factory lug nuts on wheels designed for "mag seats" or "ball seats," as they will not torque down correctly, potentially leading to wheel failure.
Torque Specifications
Subaru recommends a torque setting of 89 lb-ft (120 Newton-meters). Under-torquing can lead to the lug nuts backing off, while over-torquing can stretch the wheel studs or warp the brake rotors. In 2026, as these vehicles age, it is also wise to inspect the wheel studs for corrosion or cross-threading during every tire rotation.
Tire Specifications for the 2015 WRX
The wheels are only half of the equation. The 2015 WRX was engineered to work with specific tire dimensions to ensure the speedometer and odometer remain accurate.
- For 17x8 Wheels: The standard tire size is 235/45R17. This provides a substantial sidewall that helps absorb road imperfections, making it a preferred setup for winter driving or rougher terrain.
- For 18x8.5 Wheels: The standard size is 245/40R18. This wider contact patch and shorter sidewall provide sharper turn-in response and better lateral grip.
Load and Speed Ratings
Owners should look for tires with a load index of at least 93 and a speed rating of W or higher (up to 168 mph). Because the WRX uses a Symmetrical All-Wheel Drive (AWD) system, all four tires must be of the same brand, model, and tread depth (within 2/34ths of an inch) to avoid damaging the center differential.
Aftermarket Fitment Guidelines
The "Gold Standard" for the 2015β2021 WRX chassis (VA) in the enthusiast community has historically been an 18x9.5 wheel with a +38mm offset.
Why 18x9.5 +38?
This specific size offers a perfect balance for the VA chassis:
- Aesthetics: It sits nearly flush with the fenders without requiring significant body work.
- Tire Choice: It pairs well with a 255/35R18 or 265/35R18 tire.
- Clearance: On stock suspension, this setup usually does not rub. However, if the car is lowered on coilovers or lowering springs, the rear fenders may need to be "rolled" to prevent the tire from catching the inner lip of the fender during suspension compression.
Brake Clearance (The STI Factor)
While the 2015 WRX and STI share the same bolt pattern, they do not share the same brake clearance. The 2015 WRX uses sliding dual-piston front calipers, while the STI uses large Brembo fixed calipers. Most wheels that fit the WRX will not fit the STI because they lack the "spoke curvature" to clear the Brembo brakes. If you are buying wheels from an STI for your WRX, they will fit perfectly. If you are buying WRX-specific wheels for an STI, you will likely run into clearance issues.
Tire Pressure Monitoring System (TPMS)
The 2015 Subaru WRX utilizes a direct TPMS, meaning there is a sensor mounted inside each wheel attached to the valve stem. These sensors operate at 315 MHz.
When switching to a new set of wheels:
- Transfer Sensors: You can move your original sensors to the new wheels, provided the new wheels are compatible with TPMS valve stems.
- New Sensors: If you purchase new sensors, they must be "synced" to the carβs ECU. This requires a TPMS programming tool.
- Sensor Life: In 2026, the original 2015 sensors are likely nearing the end of their battery life (typically 7β10 years). It is highly recommended to replace the sensors if you are mounting new tires on a decade-old vehicle.
Common Mistakes and Maintenance Tips
- Using the Wrong Bolt Pattern: Even in 2026, people accidentally purchase 5x100 wheels meant for the 2014 model. Always verify the 5x114.3 measurement.
- Neglecting Hub-Centric Rings: Driving without these on aftermarket wheels is the number one cause of steering wheel shake at 60β70 mph.
- Impact Wrench Overuse: Avoid using high-torque impact wrenches to tighten lug nuts. Use a calibrated torque wrench to reach the 89 lb-ft spec.
- Ignoring the Spare: The 2015 WRX comes with a "donut" temporary spare. If you significantly increase your wheel/tire diameter, the spare may become unusable as the diameter difference could damage the AWD system.
Frequently Asked Questions
Will wheels from a 2015 Subaru WRX fit an older 2013 WRX?
No. The 2015 WRX uses a 5x114.3mm bolt pattern, whereas the 2013 WRX uses a 5x100mm bolt pattern. The wheels are not interchangeable without expensive hub conversions or adapters.
What is the widest wheel I can fit on a 2015 WRX without rubbing?
On stock suspension, an 18x9.5-inch wheel with an offset between +35mm and +45mm is generally the limit. If you use a +35mm offset with a 265mm wide tire, you may experience slight rubbing in the rear under heavy loads unless you roll the fender lips.
Do I need to align my car after changing wheels?
If you are staying close to factory specifications, a wheel change does not technically require an alignment. However, if you change the offset significantly or change the ride height (via springs or coilovers) in conjunction with new wheels, a professional four-wheel alignment is mandatory to prevent premature tire wear.
Can I use 16-inch wheels for winter tires?
No. 16-inch wheels will not clear the front brake calipers of a 2015 WRX. The minimum wheel diameter for this vehicle is 17 inches.
Is the 2015 WRX wheel spec the same as the 2021 WRX?
Yes. The entire VA generation (2015β2021) shares the same 5x114.3mm bolt pattern, 56.1mm center bore, and +55mm factory offset. This makes parts and wheels highly cross-compatible within these years.
Practical Recommendation for Owners
If you are looking to replace or upgrade your 2015 Subaru WRX wheels, the best balance of performance and fitment is a 18x8.5 +45mm to +55mm setup for a "daily driver" feel, or an 18x9.5 +38mm setup for an enthusiast-focused, aggressive look. Always ensure you purchase high-quality M12x1.25 lug nuts and a set of 56.1mm hub-centric rings if you are moving to aftermarket wheels.
For those residing in climates with harsh winters, keeping the original 17-inch Base wheels and mounting a dedicated winter tire like the Bridgestone Blizzak or Michelin X-Ice is a proven strategy to protect the car's AWD system while maintaining safety on icy roads.
