What is the width of a 215 40 R18 tire?
A 215/40R18 tire has a width of approximately 8. The width of the tire is the first number in the tire size designation, which in this case is “215”. R18 tires have a diameter of 25. The sidewall of the tire is 3.
What’s the best tire pressure for a 225-40 R18?
The recommended tyre pressure for 225/40 R18 tyres can vary slightly based on the manufacturer and vehicle. However, a general guideline is to maintain the pressure within the range of 32 to 35 PSI (pounds per square inch). No, for most cars a tire pressure of 40 psi is too high. You might find 40 psi suitable for some vehicles, especially if they’re carrying heavier loads or if the manufacturer’s recommendation is close to that figure. However, it’s generally too high for most passenger cars, which usually recommend between 30-35 psi.ideal tire pressure tire pressure between 32 to 35 psi is suitable for most vehicles. However, one can go as low as 20 psi (although that is not recommended). Anything below 20 psi is considered a flat tire. Psi stands for pounds per square inch.