305/40R18 tires

About 305/40R18 tires

305/40R18 means a 305 mm section width, a sidewall 40 percent of that (122 mm) and an 18 inch rim, which works out to 27.6 inches tall. Whether 305/40R18 works comes down to the wheel width it mounts on and how far it lands from the height the car left the factory with.

1 line carries 305/40R18, from 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 305/40R18 lines that do both.

Common questions

What does 305/40R18 mean?

305 is the section width in millimeters, 40 is the sidewall height as a percent of that width (122 mm here), R means radial and 18 is the wheel diameter in inches. Overall the tire stands 27.6 inches tall.

Will 305/40R18 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 305/40R18?

The tire makers list 7 to 12 inch rim widths across the 305 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.