Reply
 
Thread Tools Display Modes
Old 04-01-2019, 08:12 AM   #61
Senior Member
 
Join Date: Jul 2017
Posts: 2,379
Quote:
Originally Posted by BriaBeck View Post
As I have learned in this thread, some tires DO have a maximum pressure molded in the sidewall information. Some (most?) ST tires do not.


One thing I have learned in life so far in my 49 years, is to NEVER read more information into something than what is actually presented. So, with that said, "Maximum Load 2540lbs @ 65psi" DOES NOT mean the same thing as "Maximum Load 2540lbs @ 65psi MAXIMUM". Make sure you are NOT adding a "Maximum" where there is none!!



If you have an ST Tire that lists a maximum load at a minimum pressure (as most ST tires do it seems), then you should operate in reference to the ST industry standard and inflate to 75 psi if you are going to be operating above 65mph.



If you have an ST tire with 65psi MAXIMUM molded into the tire, then I would definitely agree that 65psi is truly the maximum allowable pressure for that tire.


You make your decision, and take your chances, no matter what.
My carilse trail hd state MAX 80 psi in big print . and i run 80 with a max speed of 81 . Think I'll stick with what the tire specs say . better safe then sorry
MR.M is offline   Reply With Quote
Old 04-01-2019, 08:45 AM   #62
Senior Member
 
BriaBeck's Avatar
 
Join Date: Jun 2018
Location: Southern Illissouri
Posts: 782
Quote:
Originally Posted by MR.M View Post
My carilse trail hd state MAX 80 psi in big print . and i run 80 with a max speed of 81 . Think I'll stick with what the tire specs say . better safe then sorry

That's exactly what I'm doing...


Quote:
Originally Posted by [B
trailerlife.com/tech/diy/rv-tires-101[/B]] Goodyear, maker of Marathon trailer tires, states in its bulletin PSB 2011-13: “Industry standards dictate that tires with the ST designation are speed rated at 65 mph under normal inflation and load conditions. Based on these industry standards, if tires with the ST designation are used at speeds between 66 and 75 mph, it is necessary to increase the cold-inflation pressure by 10 psi above the recommended pressure for the rated maximum load. Increasing the inflation pressure by 10 psi does not provide any additional load-carrying capacity.

“Do not exceed the maximum pressure for the wheel. If the maximum pressure for the wheel prohibits the increase of air pressure, then the max*i*mum speed must be restricted to 65 mph. The cold-inflation pressure must not exceed 10 psi beyond the inflation specified for the maximum load of the tire.

You gotta read all the words... not just the ones you want to see, while ignoring those you don't.


Choose to believe, or choose not to... but there it is in black and white, just like the bible.


__________________
Brian & Becky

2018 Avenger ATI 27RBS
Champion 3500
Weber Q2000, Blackstone 22", and a whole herd of flamingoes
BriaBeck is offline   Reply With Quote
Old 04-01-2019, 01:05 PM   #63
Senior Member
 
Airdale's Avatar
 
Join Date: Jul 2013
Posts: 1,508
Quote:
Originally Posted by Herk7769 View Post
According to the CAT scale folks and the attached Firestone "How to weigh and set tire pressures for your RV" you weigh each wheel and then set the pressure of the tires on each axle based on the highest loaded tire on each axle. Always balance the pressure of the tires on each axle equally.

For example on a 5th wheel, the deck (towing) angle can shift load from the front trailer axle to the rear in a nose high tow.

Never exceed the max rated weight of your axle or tires.

I see the CAT folks have amended the web site:
https://catscale.com/how-to-weigh/

They no longer offer individual wheel weights as a service. You will need to do total axle weights there or find someone with a wheel scale or buy the set.

https://www.amazon.com/ProForm-67650...gateway&sr=8-2
It's important to remember who's the primary user of CAT scales. Commercial vehicles. They abide to different regulations that are not applicable with the standards for vehicles built under the guidance of FMVSS. To correctly maintain inflation pressures for vehicles that conform to FMVSS (standards) you should follow the guidance given in your vehicle's owner's manual, or the information on the vehicle certification label/tire placard.
__________________
A Trailer Tire Poster
Airdale is offline   Reply With Quote
Old 04-01-2019, 01:23 PM   #64
Senior Member
 
Airdale's Avatar
 
Join Date: Jul 2013
Posts: 1,508
Quote:
Originally Posted by BriaBeck View Post
That's exactly what I'm doing...





You gotta read all the words... not just the ones you want to see, while ignoring those you don't.


Choose to believe, or choose not to... but there it is in black and white, just like the bible.


That procedure was started many years ago by MAXXIS. TowMax and GY Marathons were quick to follow.

It's really not of any more use today than it was when they issued their bulletins. A high percentage of OEM wheels back then were pressure rated to match the pressure requirements of the OEM tires.

The trailer tire industry has, with very few exceptions, progressed far beyond needing excessive inflation pressures to go a little faster. Almost all ST tires now have speed ratings right on their sidewalls that are 75 MPH or greater. MAXXIS is the only hold-out, that I know of.

(I can no longer find the MAXXIS bulletin on the net. Soon after it was first published a USTMA tire publication said inflation pressures should not exceed the sidewall pressure. IMO, MAXXIS wanted to avoid a conflict and pulled their bulletin. Also IMO, the tire retailer that now publishes that information is quoting it from one of the tire manufacturer's information that is probably antiquated.)
__________________
A Trailer Tire Poster
Airdale is offline   Reply With Quote
Reply

Tags
pressure, tire

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.



All times are GMT -5. The time now is 08:15 PM.