225/50RF18 is a run flat tire size that’s commonly found on 90s and 2000s era cars such as the Chevrolet Malibu, Buick LaCrosse, Honda CR-V, and Mazda6. For vehicles like this, you’ll probably want all-season tires that can offer good road manners, long wear, warranty coverage, year-round traction, a quiet, comfortable ride, and predictable handling. Or, if you’re a driver who likes to push the envelope, maybe summer or ultra-high-performance tires would be more your speed, with their superior cornering ability and steering response. Just be mindful that the softer, “stickier” tread compound these tires use will stiffen and lose traction in colder weather; UHP tires shouldn’t be used when it's colder than 45 degrees Fahrenheit outside.