Tire Pressure

[Gaffer75]

I have a 2018 Jayco PRECEPT 29v class A motorhome. The label inside the coach states that the air pressure should be 82 lbs. This sounds low to me. The tire shows it's max pressure is 110. Let me know what you put in your tires. I now have 90 but think that's low although it's higher than what the label says.

[EA37TS]

My suggesstion

Take you coach across a set of scales and after you have the weight set the pressure to the manufacturers recommendation and not to your personal thoughts. What everyone else sets their pressure to may not be the same as what you need to set yours to based on weight. Example, although my Challenger's label stated 110 lbs based on weight Michelin recommended 90 psi. That is what I set the pressure to and had no issues and good wear for over 5 years.

Since we are taking the Accolade on it's shakedown cruise this weekend the first stop tomorrow will be on the CAT scales about 5 miles from the house. Saturday morning after the tires have cooled I will set the pressure based on Michelin's recommendation, which I expect it to be considerably less than the 110 psi the dealer put in at delivery.

Again, a suggestion.

[Gaffer75]

EA37TS

Thanks for the quick response and good advice. I will have to load up the RV and then weigh it. Based on the results I can adjust the air pressure.

[RVermont]

Cat scale is a good start but doesn't take into account your side to side or each axel end weight. Make sure you allow for any uneven loading. Get the tire pressure chart for your tires and work from there.

[Gaffer75]

Thanks for your reply. Will check that out too.

[RogerR]

A motor home is a steerable vehicle and the pressures the manufacturer set are not just for tire longevity but also for braking and steering safety. Too high or low a pressure and the tires will not steer right and it could effect braking. Not following design pressure is rarely a good idea.

[Gaffer75]

Thanks for the good advice .

[Vicr]

Originally Posted by RogerR

A motor home is a steerable vehicle and the pressures the manufacturer set are not just for tire longevity but also for braking and steering safety. Too high or low a pressure and the tires will not steer right and it could effect braking. Not following design pressure is rarely a good idea.

Who's post are you referring to?

[RogerR]

Gaffer75 posted about a Precept Class A motorhome.

[SamJ]

Here is a useful link on the subject https://www.goodyearrvtires.com/tire...n-loading.aspx

For what it's worth, the lable on our Alante 31R (20.5k chassis) called for 82 psi. Our weight based calculation calls for 80-81.