255/70R18 Tire Size Specifications & Compatible Vehicles
Compatible Vehicles
The following vehicles use 255/70R18 tires from the factory:
Alternative Tire Sizes
These tire sizes are within 3% overall diameter of 255/70R18 and may be used as replacements:
Popular Comparisons
See how 255/70R18 compares to other common tire sizes:
Understanding 255/70R18
The tire size 255/70R18 means the tire has a section width of 255mm, an aspect ratio of 70% (the sidewall height is 70% of the width), and fits a 18-inch rim.
Overall Diameter = (178.5 x 2) + (18 x 25.4) = 814.2 mm
Circumference = 814.2 x π = 2557.9 mm
With an aspect ratio of 70%, this is a high-profile tire with a tall sidewall. High-profile tires provide a cushioned ride, better absorption of road imperfections, and greater resistance to sidewall damage — ideal for trucks, SUVs, and off-road use.
Choosing Replacement Tires
When replacing 255/70R18 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.