I know there are several emails out there and I think I got it but never hurts to ask the group. I have a 30 ft Fifth Wheel with Carlisle Radial Trail RH Trailer Tires ST225 /75 R15 117N E1. The tire states on the side Max Load at 80 PSI.Everything I seem to have read indicates I should maintain 80 PSI in the tires. Does everyone agree with this? I believe they put around 70 PSI in them at the dealer but it has been a while. So what's the opinions? Do I keep them at 80 or a little under? Help is appreciated!!

80 is the max. I run 75 in my tires.

What does Keystone say? I know Northwoods says with typical loading they recommend 80 psi (cold)

ST tires should always run the pressure stated on the sidewall or more.

Keystone doesn't provide Load Range E tires so the air pressure is a lot less. So far most people seem to indicate inputs indicate either 75-80 PSI as best...I have talked to some people that only run 65 PSI...but not sure why they run less. Rig weighs around 11K lbs..fully loaded with everything.

Many tire company's web sites will have a table of inflation pressure vs load on the tire. The pressure on the sidewall is the max pressure for the max load. But the tables recommend lower pressures for less than maximum loads.A tire that is over inflated for the load on it can cause the tire to wear faster in the center. Inversly, a tire under inflated for the load on it can cause the tire to wear faster on the edges. A correctly inflated tire will wear more evenly providing longer life and better traction.

Fifth Wheel Tire Pressure | Good Sam Community

20 Replies

shepstone
Explorer
Feb 13, 2016
I have the same tires and I keep them at 80
JIMNLIN
Explorer III
Feb 13, 2016
fj12ryder wrote:
BB TX gave the link for what Carlisle, the maker of the OP's tires, says about ST tire pressure. No weight chart, just plain English: "Maintain air pressure at the maximum PSI recommended on the tire sidewall." Doesn't get any easier than that.

Easy peasy.

And along with that statement is Carlisle tire warranty:

warranty
The Warranty is void if the tire or wheel fails due to damage from improper inflation pressures, exceeding the maximum speed limit, or overloading the tire beyond the maximum load capacity stated on the sidewall.

OP.....read this from rvtiresafety.com on reasons a tire on vehicle with close spaced axle such as a RV trailer require max sidewall pressures.....assuming the tires meets OEM load requirements.
http://www.rvtiresafety.com/2013/11/interply-shear-and-other-techno-babble.html
fj12ryder
Explorer III
Feb 13, 2016
Anybody else read the link that BB TX posted? Directly from Carlisle website on their recommendation for their ST tires:

"Maintain air pressure at the maximum PSI recommended on the tire sidewall."
time2roll
Nomad
Feb 13, 2016
Assuming they are OEM size and load range... anything between GVWR sticker and sidewall max is fine.
loggenrock
Explorer
Feb 13, 2016
And I thought 5th wheels were steel and didn't need to be inflated... sorry ST
hotpepperkid
Explorer
Feb 13, 2016
Load the trailer up to whatever your max load might be and go weigh it then check with the tire manufacture to see what pressure is required for that weight and air them up to that and not worry about if you happen to travel lighter at times
fj12ryder
Explorer III
Feb 12, 2016
Old-Biscuit wrote:
fj12ryder wrote:
BB TX gave the link for what Carlisle, the maker of the OP's tires, says about ST tire pressure. No weight chart, just plain English: "Maintain air pressure at the maximum PSI recommended on the tire sidewall." Doesn't get any easier than that.

Easy peasy.

Don't confuse things with straight statements---especially ones from the horses mouth.

It's a tire thread :B
Sorry about that OB, I really should know better. :)
Old-Biscuit
Explorer III
Feb 12, 2016
fj12ryder wrote:
BB TX gave the link for what Carlisle, the maker of the OP's tires, says about ST tire pressure. No weight chart, just plain English: "Maintain air pressure at the maximum PSI recommended on the tire sidewall." Doesn't get any easier than that.

Easy peasy.

Don't confuse things with straight statements---especially ones from the horses mouth.

It's a tire thread :B
fj12ryder
Explorer III
Feb 12, 2016
BB TX gave the link for what Carlisle, the maker of the OP's tires, says about ST tire pressure. No weight chart, just plain English: "Maintain air pressure at the maximum PSI recommended on the tire sidewall." Doesn't get any easier than that.

Easy peasy.
darsben
Explorer II
Feb 12, 2016
UNless you weigh your rig. The correct answer is max on sidewall.

Forum Discussion

Fifth Wheel Tire Pressure

20 Replies

About Technical Issues

Related Content

Tire pressures

Tire Pressure?

Wheel bearing repacking

Front wheel tire pressure

Tire pressures