235/30R18 tires have a diameter of 23.6", a section width of 9.3", and a wheel diameter of 18". The circumference is 74.0" and they have 857 revolutions per mile.
Specs may vary by manufacturer. learn more
When searching for the perfect tire for your vehicle you need options. Click the "Alternate Sizes" button to see a list of similar tire sizes. You can then change the wheel size to see alternate sizes on a different diameter wheel.