Tyre Width Tyre Width. 225/40R18 92Y. The first three digits on the sidewall of your tyre show the width in millimetres. For example, this means that if the tyres first three digital have been marked ‘225’, the tyre will then measure exactly 225mm across its tread from one sidewall to the other.
What is the correct TYRE pressure for 225 40 r18?
Mine says 39 psi front/45 psi rear. Hope that helps.
What happens if you put 40 PSI in tires?
For instance, if 35 psi is recommended, and the maximum safe pressure listed on your sidewall is 44 psi, you can safely put 38 or 40 psi in your tires. You can even go to 44 psi. You’ll experience a harder ride, but you won’t create a blowout danger. You may even experience sharper cornering and increased fuel economy.
Is 40 PSI too high for tires?
Specifically, the level of 40 psi can be suitable for passenger cars or sports cars. But this is too high for small cars with a recommendation below 35 psi, while 40 psi is too low for large trucks. The recommended level for the tires of famous sports cars and passenger cars is between 32 -40 psi.
What does 225 40R18 mean? – Related Questions
What is the 4 PSI rule?
Let’s look at how to apply the 4psi rule: Use the recommended pressure on your tyre placard as a start point, drive for approximately one hour, stop and check the pressure. If it’s gone up by 4psi then your pressures are spot on.
Is it better to over inflate or Underinflate tires?
If your car is underinflated, then it is going to feel sluggish. Underinflation will also lower the fuel economy of your car and shorten the lifespan of a tire. Overinflating a tire will also shorten its lifespan. The car will also handle more poorly because less of the tire is in contact with the road.
Why do dealers overinflate tires?
Tires are overinflated during the shipping process, so as to help prevent the flat spot from forming in the tire as it sits for days on in during the shipping process. It is supposed to be part of the delivery check process that the service department deflates the tires to the proper pressure.
What psi should 18 inch tyres be?
Most passenger cars have a recommended PSI between 31 and 35 when the tyres are cold.
What is the recommended tire pressure for 18 inch tires?
5″ wheels with 235/40-18 tires I had to run 28 psi cold in order for the tires to wear evenly. With my new 18×8″ wheels with 245/40-18 I find that 32 – 34psi is optimal for this combination. You would do best to start at around 32psi and experiment to find the best values that work for you.
What is the tyre pressure for 235 40 r18?
Tire Pressures
| Tire Size |
Normal Load |
Full Load |
| Front |
Rear |
| 205/60R16. |
33 psi (2.3 bar) |
45 psi (3.1 bar) |
| 215/50R17. |
33 psi (2.3 bar) |
42 psi (2.9 bar) |
| 235/40R18. |
33 psi (2.3 bar) |
42 psi (2.9 bar) |
Is tire pressure 35 too high?
Most passenger cars’ psi requirement will be between 30 to 35 psi, but several vehicles fall outside of that range and every vehicle will have specific requirements. Good tire air pressure ensures that tires wear evenly, provide a smooth ride, and increase fuel efficiency.
What is the 4 PSI rule?
Let’s look at how to apply the 4psi rule: Use the recommended pressure on your tyre placard as a start point, drive for approximately one hour, stop and check the pressure. If it’s gone up by 4psi then your pressures are spot on.
Do bigger tires need more PSI?
Therefore, a larger tire needs less pressure than a smaller tire to carry the same vehicle weight.
Is it OK to fill tires to max PSI?
What happens if you inflate your tires to the max PSI? Your tires’ max PSI almost always exceeds the recommended pressure. It isn’t advisable to fill your tire to this pressure for everyday driving. At max PSI, your car does not handle as well, braking is impaired, and you could risk dangerous blowouts.
Why do dealers overinflate tires?
Tires are overinflated during the shipping process, so as to help prevent the flat spot from forming in the tire as it sits for days on in during the shipping process. It is supposed to be part of the delivery check process that the service department deflates the tires to the proper pressure.
What PSI will damage tire?
If you have standard passenger tires (ninety percent of vehicles do) the lowest tire pressure you can generally drive with is 20 pounds per square inch (PSI). Anything under 20 PSI is considered a flat tire, and puts you at risk for a potentially devastating blowout.
Is it OK to have uneven PSI in your tires?
In short, running imbalanced duals increases the odds of a blowout on the overloaded tire and significantly shortens tire life on the underinflated tire. Industry data has shown that the pressure difference at which this becomes an issue can be as little as 5 psi.
Should you overinflate tires in winter?
In fact, properly inflated tires with adequate tread depth provide the best traction in winter weather. Over-inflated tires can lead to losing traction and control on icy roads, increasing the risk of a car accident. Overinflation can also lead to uneven tread wear and potential tire damage.