Tire Pressure?

[jhydock34]

Owner of 2006 Newmar Cypress 5TH Wheel. I have Sailun ST235/85R16 14 Ply tires. Max Cold PSI is 110.
My question is: When loaded, what PSI should I run the tires on?

 

[Joe Hogan]

Depending on your tire, each manufacturer has weight tables for tire pressure. Attached is the one for Michelin

https://www.michelintruck.com/assets/pdf/Truck_Tire_Data_Book_Jan2007.pdf

 

[jhydock34]

I keep reading to refer to owners manual for PSI information when towing.
There is no information listed in manual as to how much pressure should be in each tire when rv is loaded.

 

[TJ&LadyDi]

Here’s a link to a Sailun tire pressure chart.

https://fifthwheelst.com/documents/Copy%20of%20Load%20and%20Inflation%20All%20ST-Modified.pdf

Weigh your trailer (preferably one side at a time and one axle at a time), do a little math to determine the weight an individual wheel is carrying, find your tire size and the chart will tell you what pressure to run.

TJ

 

["EZ"]

I keep reading to refer to owners manual for PSI information when towing.
There is no information listed in manual as to how much pressure should be in each tire when rv is loaded.

You're going to have to weigh your camper first to see how much weight you have on each tire.

 

[FL-JOE]

Owner of 2006 Newmar Cypress 5TH Wheel. I have Sailun ST235/85R16 14 Ply tires. Max Cold PSI is 110.
My question is: When loaded, what PSI should I run the tires on?

Already been given some pretty good guidance. I have similar Sailun tires on my current fiver (triple axle). Initially I was running them at 95psi but noticed that the temps and psi numbers were increasing a little more while traveling at highways speeds than I liked. I am now running them at 105psi and the increases while underway seem more normal to me.

I haven't weighed my rig yet and I really need to get that done. I realize a 4-corner weight is the best however I have always just ran across a CAT scale at a truck stop and used those numbers in the past. Once you determine an approximate number for each tire you can check the Sailun chart to see what psi they are suggesting.

While we are on the subject of tires, are you utilizing a TPMS (tire pressure monitoring system)? IMHO it is the #1 most valuable piece of safety equipment an RVer can have.

 

[6pack]

I pull a 24" enclosed trailer (race car} and always go with the manufacturers recommendations for COLD air pressure. As the tires turn and froad friction warms up the air and air pressure expands as it gets hot. Same with race car tire the friction from the track heats up the air in the tires and expands. If you're a NASCAR fan you know they adjust the tires air pressure as the track heats up. Tire companies spend a lot of time and money on R&D. So why reinvent the wheel, pun intended....