Tire pressure

[aboeck3]

Tire pressure question. My tires are Michelin 275/80R XZA3 LRH. They are on a 2017 Winnebago Journey 42. The Michelin TP chart says max air pressure is 120 psi. My question is what pressures would you all recommend as a safe, comfortable pressure to keep these tires at? 120 psi seems high for a nice ride.

[4x4van]

As Ivylog says, look for the Federal Tire Placard near the driver's seat. Use the pressures listed there, NOT the max pressures listed on the tire sidewall. Keep in mind that the Placard assumes that you are at your max GAWRs. You should never run a higher pressure than that, because you should never load your rig heavier than that.

As soon as is practical, get your rig weighed, 4-corner is best, but front/rear will suffice. Then use the pressures that the tire manufacturer recommends based on the actual weights.

[Executive45]

I run 115 steer 100 drive 90 tag. Tire size - 315 steer and all others are 295s. All Michelin. PSI is based on my axle weights...YMMV...Dennis

[Ivylog]

There should be chart next to the drivers seat...start there until you weigh at least each axle at a truck stop. Educated guess, 115 front, 105 drive, and 85 tag.

[darsben1]

Short answer is leave them at max unless you are willing to do the work

[roam1]

weigh it, use chart, + 5#

[Bill_Satellite]

aboeck3 wrote:
Tire pressure question. My tires are Michelin 275/80R XZA3 LRH. They are on a 2017 Winnebago Journey 42. The Michelin TP chart says max air pressure is 120 psi. My question is what pressures would you all recommend as a safe, comfortable pressure to keep these tires at? 120 psi seems high for a nice ride.

It is impossible to answer this question until you have weighed ALL 4 CORNERS of your coach. You can get a rough guess by weighing front and rear axles but you could still be dangerously wrong without accurate information. Once you have the corner weights you will be able to look at the Michelin weight tables to determine the proper inflation.

[johnsonbert]

Here is the link to the Michelin inflation tables, just choose your tire diameter at the top of the tables. Weigh your rig, loaded, and then use the tables to determine the tire pressure to run, by weight. 4 corner weight is the best, but axle weight will do, divided by number of tires on axle, at any truck scale. I usually add about 5 lbs for a little extra cushion. Hope this may help, Happy Trails Bert

Michelin tire inflation chart

[jplante4]

Max sidewall will be safe until you have the coach weighed with all of your normal traveling accoutrement aboard. Then use the manufacturer's chart for you weight.

I ran 125 psi on the Yokohamas until I got weighed at 22,000 lbs and found I could drop to 90 psi. I added 5 for a buffer. Made a big difference in the ride.

[Leeblev]

Those are my front tires. Since they are Michelin, they are very comfortable at 120 psi. Any other tire may not ride as smooth. I keep my tires at the recommended pressure because you WILL get better mileage when you inflate according to the MFG recommendations. I have never had a problem when my tires are properly inflated. I haven't, but I would sacrifice comfort for mileage.

[Mandalay_Parr]

Pressures are based on weight.
Need to weigh the coach fully loaded.
Four corners if possible. Otherwise each axle.

[Lwiddis]

"120 psi seems high for a nice ride". To me also but not being a tire manufacturer I dont know. What does your RV manufacture say in your owner's booklet?

[K_Charles]

Weigh it and then put in the proper amount according to the chart