The first rule in this process is to never exceed the maximum tire pressure listed on the sidewall of your tires. It does not matter what vehicle or trailer you have, this is a rule that cannot be broken. That number is the maximum amount of pressure your tire can handle
Some RVs come with a placard inside the unit and this placard may provide a different maximum psi for your tires. This psi listing is the maximum pressure needed when you load your RV to the maximum amount of weight your axles can handle.
To learn more about this topic, just continue to read our article. It has the information you want to know about so you can fill your tires to the right psi level. Having the right pressure in your tires is one way to protect them from blowing out at the wrong time.
This figure will depend on a few factors. First, there is the maximum tire pressure that is placed on the sidewall of the tires you are going to buy. This is the maximum amount of air pressure that can be put into a tire at maximum load.
The different tire companies put out a load rating chart that tells you the maximum amount of weight the tire can handle. This chart usually indicates this amount by using letters not numbers.
The higher the letter, the more weight the tire can hold. For example, an LR ‘A’ tire holds the least amount of weight. An LR ‘H’ tire holds the most amount of weight.
What this all means is that the recommended tire pressure for a Class A RV will depend on these factors. It would be nice to give you a specific number but each tire and each brand of the tire has different recommendations.
The unbreakable rule of thumb mentioned above gives you the recommended tire pressure and it is on each sidewall of each tire you buy. Tires suffer from the Goldilocks syndrome.
The tire pressure has to be just right or you are going to have problems with the tire. Both over-inflating and under-inflating your tires are not the right move to make.
We will provide one chart for two specific tires as there are just too many tires to list here in this short space. Then we will provide links to more detailed charts to help you find the right tire pressure for your Class A RV.
LT245/70R19.5 LRH- all figures for weight are in pounds
To get the accurate tire pressure for your RV, you need to have what is called four corner weights. What this term means is that you have to have your RV weighed at all the tire points to see what weight is on each axle and where that weight is.
The problem is that RVs do not come to form the manufacturer balanced. Then when you buy your RV and start loading in your supplies, etc., you can be adding to this disparity in weight distribution.
As an example, if your axle is rated for 6000 pounds and your tires are rated for 3000 pounds each, you would think you are fine. But when you have the four-corner weigh-in done, you may find that one tire is holding 4900 pounds while the other tire is only holding 1100 pounds.
What you have done is overloaded one tire and that can cause your problems down the road. RVs are designed for function, not balance. When you are weighed correctly, you can look at those charts we are about to link to and see what tire pressure you need in your tires.
The first one is here and the second one is here. The information for our charts came from the first link.
There are several reasons for this and one main one will be the amount of weight the tires have to hold. This is the weight that includes the weight of the RV, and the cargo and passengers inside.
While trailers do not have passengers inside during travel, they will when you are stopped for the night and using the trailer. You need to factor that weight in when you buy trailer tires.
Coaches will have passenger weight included in their equation and you have to make sure you are not overloading the coach with people or supplies. The extra weight will damage those tires eventually or weaken them as you travel.
The psi is so high so that those tires can handle all the weight you place on them. As you can see from the previous section, it is easy to overload one tire and not place enough weight on another tire.
The best time to check your psi is when the tires are cold. By ‘cold’ it is meant when the tires have not been used in the past 4 hours and are the same temperature as the outside ambient temperature.
The reason you do not check the tires when they are ‘hot’ is that the heat will add psi to the tires. If you check them when they are hot you can be confused by the over-inflation and let the air out of your tires.
If you do that, you are under-inflating your tires and setting yourself up for a possible blowout. RV tires are complicated at times and you should talk to some tire experts or you should look at the many charts that are on the internet to find the right cold tire pressure for the weight of your RV+
We just explained what cold and hot mean in relation to tire pressure. The things you do need to be aware of are that one, the sun can heat your tires between 10 and 50 degrees F.
That means you will want to check your tire pressure before the sun heats them up. When sitting in the sun or driving, the tire pressure will increase 2% for every 10 degrees F the tire temperature goes up. That equals 2 psi for every 10 degrees.
For passenger cars, it is 1 psi for every 10 degrees. Some people will say you should add extra psi to give you a measure of extra safety. For example, if your passenger car tires need 35 psi then add 3 more. For light trucks at 65 to 80 psi, add 5 psi.
Then for Class A RVs at 100 to 110, you should add 10 psi from the recommended minimum. There are a lot of details that need to be considered as well as the age of the tires will play a role in the psi levels you use.
Again it will be difficult to give an exact figure as RV tires are not the same. Class A RVs range from 30 to 40+ feet in length and they take different tires and have different guidelines.
Plus, the tires are not made the same so you really need to be careful which brand of tires you buy. The current figure is a percentage of the psi maximum on the side of the tire.
If your tire pressure is 10 to 20% under the maximum stated on the tire’s sidewall, then you can expect to blow a tire out eventually. The under-inflation causes the sidewalls to flex a lot more than they should.
This flexing creates heat that undermines the integrity of the tire. That weakening of the integrity of the tire shortens the tire’s lifespan. Then the under-inflation puts more rubber on the road which increases resistance.
The increased resistance not only creates heat but it lowers your fuel mileage. This is one reason why you need to find the right psi for your RV’s tires. Over-inflation is not good either. The tires are built to handle only so much air, then they can blow as well.
When you think about RV tires, think of Goldilocks. The tires cannot have too much air pressure in them and they cannot have too little. The psi has o be just right for you to get the maximum benefits from those tires.
Use the charts above and linked to help you get the best air pressure for your tires. That way you can have one less worry when you are out on the road. Unfortunately, the correct tire pressure will not stop all risks and dangers to your tires.