What is the tyre pressure for 225 40r?
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). Considering highway tyres are best suited to highway driving and sealed roads, the recommended tyre pressure is anywhere between 32 – 35 psi, like regular car tyres. You may find that with highway tyres you need to check and adjust the pressure a little more regularly due to the long driving distances.The inflation pressure in tires generally drops by 1 to 2 psi for every 10 degrees the temperature lowers. Also, when you drive your car, and the tires warm up, the pressure in the tires will increase one psi during each five-minute interval in the first 15 to 20 minutes you drive.