225/50R18 Tire Size Specifications & Compatible Vehicles
Compatible Vehicles
The following vehicles use 225/50R18 tires from the factory:
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 225/50R18 and may be used as replacements:
Popular Comparisons
See how 225/50R18 compares to other common tire sizes:
Understanding 225/50R18
The tire size 225/50R18 means the tire has a section width of 225mm, an aspect ratio of 50% (the sidewall height is 50% of the width), and fits a 18-inch rim.
Overall Diameter = (112.5 x 2) + (18 x 25.4) = 682.2 mm
Circumference = 682.2 x π = 2143.2 mm
With an aspect ratio of 50%, this is a standard-profile tire that balances ride comfort with handling precision. This profile range is the most common for passenger cars, crossovers, and light SUVs.
Choosing Replacement Tires
When replacing 225/50R18 tires, verify the size matches your vehicle's tire placard (typically found on the driver's door jamb or in the owner's manual). The NHTSA Tire Ratings Search tool lets you look up manufacturer load and speed ratings for specific tires.
Key factors beyond size: load index (must meet or exceed the vehicle's requirement), speed rating (must match or exceed the original specification), and seasonal type (all-season, summer, or winter) based on your driving conditions. The U.S. Tire Manufacturers Association recommends replacing all four tires at once, or at minimum in pairs on the same axle.