Understanding the 2018 Subaru Outback tire size is essential for owners who value the model's rugged capability and all-weather confidence. This specific year offered a standard setup that balanced comfort and traction, while also providing clear upgrade paths for drivers seeking a more aggressive look or specific performance traits. Selecting the correct diameter, width, and speed rating ensures the suspension, steering, and electronic stability systems function as intended by Subaru engineers.
Standard 2018 Outback Tire Dimensions
The most common OEM fitment for the 2018 model year is a P225/60R17 tire mounted on a 7-spoke alloy wheel. This combination delivers a versatile footprint that handles light off-road gravel paths and highway cruising with equal composure. The 60% aspect ratio provides a comfortable ride quality by allowing the tire sidewall to absorb minor road imperfections, which is a signature trait of the Subaru's sedan-like ride comfort despite its raised stance.
Performance and All-Season Options
For buyers in regions with harsh winters, the 2018 Outback often rolled off the lot wearing all-season touring tires that emphasize longevity and quiet cabin noise. These rubber compounds are engineered to maintain flexibility in cold temperatures, though they are not a substitute for dedicated winter rubber. Many enthusiasts immediately swap these for a dedicated winter set to unlock the full potential of the Symmetrical AWD system during snow and ice events.
All-Weather Alternatives
All-season touring tires for year-round daily driving comfort.
Three-season performance tires for warmer climates with dry handling focus.
Dedicated winter tires with aggressive siping for maximum ice and snow traction.
Aftermarket and Custom Size Options
Once the warranty period concludes, many 2018 Outback owners look to modify the visual and mechanical profile of their vehicles. A popular upgrade involves increasing the wheel diameter to 18 inches while selecting a tire width in the 235 or 245 millimeter range. This alteration lowers the center of gravity slightly and fills the wheel arch for a more aggressive stance that aligns with contemporary styling trends.
Larger Wheel and Tire Fitment Guide
Speed Rating and Load Index Importance
When replacing tires, adhering to the specified speed rating is a safety requirement that is often overlooked. The 2018 Subaru Outback typically comes with a V-rated component, which corresponds to a maximum speed of 149 mph. Choosing a replacement with a lower speed rating can cause excessive heat buildup and potential failure, whereas selecting a higher rating ensures the vehicle's dynamic capabilities are never compromised by the rubber.
TPMS and Maintenance Considerations
The Outback is equipped with a direct Tire Pressure Monitoring System (TPMS) that alerts the driver to pressure drops of 25% or more. This technology is crucial for maintaining fuel efficiency and tire longevity, as under-inflation is a leading cause of uneven wear and overheating. Regular checks, especially during temperature fluctuations, are vital to ensure the system provides accurate readings and prevents unnecessary strain on the AWD differential.
