315/30R18 means a 315 mm section width, a sidewall 30 percent of that (95 mm) and an 18 inch rim, which works out to 25.4 inches tall. Whether 315/30R18 works comes down to the wheel width it mounts on and how far it lands from the height the car left the factory with.
2 lines carry 315/30R18, from 2 brands (Falken and Nitto). By type that is 1 performance summer. The tire has to stay near your car's stock height and mount on your wheel width, so pick the car and the wheel set and the page keeps only the 315/30R18 lines that do both.
Common questions
What does 315/30R18 mean?
315 is the section width in millimeters, 30 is the sidewall height as a percent of that width (95 mm here), R means radial and 18 is the wheel diameter in inches. Overall the tire stands 25.4 inches tall.
Will 315/30R18 fit your car?
Pick your year, make and model and the tires page answers it for yours. The wheel width has to carry the section width and the overall height has to stay near where the car started.
What wheel width fits 315/30R18?
The tire makers list 8 to 12.5 inch rim widths across the 315 mm sizes we carry, and each product page shows the range for that line. Pick an 18 inch wheel set and the tire step checks the width for you.
