Tire Pressure

[MTK46]

I only brought up axle rating as max air pressure is 1760 lbs over axle rating per axle. 100 psi will be 4080 lbs per tire.
I'm at 15,500 lbs on my axles.

[Cummins12V98]

Originally Posted by MTK46

I only brought up axle rating as max air pressure is 1760 lbs over axle rating per axle. 100 psi will be 4080 lbs per tire.
I'm at 15,500 lbs on my axles.

"WE" understand that but some may not is why I mentioned it.

My axle ratings are 8k each but my combined load is 17,500#. I am actually within the IS specs at that weight.

[CALinSC]

Your minimum tire inflation pressure is displayed on the vehicle certification label. NHTSA and USTMA both agree that the vehicle manufacturer's recommended inflation pressures should NEVER be reduced below what is recommended for them on that vehicle.

Inflation to the load carried is not an approved method for tires installed under the guidance of FMVSS.

Inflation pressures for the load carried comes from the truckers regulations (FMCSA) and are not applicable for RV trailers.

Someone referenced a GY inflation recommendation. They may not have read to the bottom line; here it is:

"Tire pressure should never be reduced below the vehicle manufacturer's recommended levels to support load conditions in order to improve the ride quality of a vehicle. The difference in ride quality is not significant. When minimum inflation pressure requirements are not met, tire durability and optimum operation can be affected."

The vehicle manufacturer's tire inflation recommendations are the minimum inflation requirement.

[Cummins12V98]

A little common sense goes a LONG ways. There is a reason they make load/inflation charts.

There are many DRV's that simply don't need 125psi and some do like me that have 17,500# on two axles. Tripple axle with same load no way needs that much air.

GY states to ADD 5psi if using the charts. They also state that you will get the best ride, tire wear and stopping by using PROPER inflation.

Now yes there are the "CYA" Agencies that you can blindly follow if you choose.

God gave me a brain and I choose to use it. By doing so I get perfect tread wear and long tire life on all my RV and Vehicle tires.

[monaj02@frontier.com]

Cummins I went to the Cat Scale steer axel 4800 Drive axel 6840 Trailer axel 12280 gross weight 23920 that is loaded Empty it is steer axel 4920 Drive axel is 3380 Gross weight is 8300 with me in it sticker in door jamb says cargo weight 2148 running load range E on tires I think I am 1300 lb over what do you think

[Notanlines]

Bob, the gross vehicle weight on your truck is probably 10,000. Your drive and steer weight is 11,640. You're 1,640 pounds over. We need to know that gross vehicle weight most of all from your door sticker.
Odds are your truck weighed 7852 from the factory, hence the 2148 maximum cargo capacity.
.

[monaj02@frontier.com]

Originally Posted by Notanlines

Bob, the gross vehicle weight on your truck is probably 10,000. Your drive and steer weight is 11,640. You're 1,640 pounds over. We need to know that gross vehicle weight most of all from your door sticker.
Odds are your truck weighed 7852 from the factory, hence the 2148 maximum cargo capacity.
.

My truck weighs 8340 with fuel and myself GVWR ON STICKER IS 10,000 so yes your correct I am over I will do short runs it feels good any recommend vehicles would be appreciated thank you

[monaj02@frontier.com]

Originally Posted by Notanlines

Bob, the gross vehicle weight on your truck is probably 10,000. Your drive and steer weight is 11,640. You're 1,640 pounds over. We need to know that gross vehicle weight most of all from your door sticker.
Odds are your truck weighed 7852 from the factory, hence the 2148 maximum cargo capacity.
.

The trailer has 12k on axles truck weighs 8340 with fuel and me sticker on door GVWR IS 10,000 she feels stable but will consider some truck options if you have any

[Cummins12V98]

Originally Posted by monaj02@frontier.com

Cummins I went to the Cat Scale steer axel 4800 Drive axel 6840 Trailer axel 12280 gross weight 23920 that is loaded Empty it is steer axel 4920 Drive axel is 3380 Gross weight is 8300 with me in it sticker in door jamb says cargo weight 2148 running load range E on tires I think I am 1300 lb over what do you think

You have something WRONG if you are unloading your front axle by 120#.

Load range "E" means nothing, what does the tire say capacity is at 80psi?

You have a pin weight of 3,340# per your numbers.

[monaj02@frontier.com]

Originally Posted by Cummins12V98

A little common sense goes a LONG ways. There is a reason they make load/inflation charts.

There are many DRV's that simply don't need 125psi and some do like me that have 17,500# on two axles. Tripple axle with same load no way needs that much air.

GY states to ADD 5psi if using the charts. They also state that you will get the best ride, tire wear and stopping by using PROPER inflation.

Now yes there are the "CYA" Agencies that you can blindly follow if you choose.

God gave me a brain and I choose to use it. By doing so I get perfect tread wear and long tire life on all my RV and Vehicle tires.

I have 12,000 pounds on two axles what pressure should I run 17.5 saline tires

[monaj02@frontier.com]

Tires capacity is 6050 pounds at 125 psi

[Cummins12V98]

Originally Posted by monaj02@frontier.com

Tires capacity is 6050 pounds at 125 psi

LOTS of capacity!

Now, what is the tire capacity at 80psi max inflation on your truck???

[monaj02@frontier.com]

On truck 3640 at 80psi the fifth wheel has 12k on duel axel what psi should I run them those tires have 6050 lb at 125 psi and how about truck tires

[anijet]

Sailun chart says 4470# at 70psi min. for a 235/75R17.5.

I would run no less than 100 psi to minimize the shear stress.

[CALinSC]

My posts are not intended to contradict: they are from a vast reference collection of the way things are supposed to be done in accordance with the governing body and that body's accepted standards from such organizations as the TRA and USTMA.

Here is a take on the vehicle manufacturers recommended cold inflation pressures for OE tires. (OE tire load capacity and recommended cold inflation pressures for the replacements for replacement tires is derived from what the OE tires provided).

All reputable tire wholesale and retail dealers of tires will train their installers in the SOPs provided as industry standards by the USTMA.

The vehicle manufacturers recommended cold inflation pressures for OE tires are the minimum acceptable pressures for that fitment. That is supported by NHTSA with a short statement; “the cold tire inflation pressures depicted on the vehicle certification label are the correct inflation pressures.”

Determining Proper Inflation Pressure (USTMA)

Use of the tires, wheels, and inflation pressures as specified on the vehicle tire placard, certification label or in the service manual ensures that these components can carry the maximum rated axle loads (GAWR) - trailer axles - and maximum vehicle weight (GVWR), - self propelled RV - and also maintains other performance characteristics, if any, intended by the vehicle manufacturer. At a minimum, the tires on each axle should not be over loaded or under inflated if the vehicle is properly loaded.

With actual weights of the loaded RV acquired by weighing, it is possible to compare them against the GAWR, GVWR, and tire capacities posted on the vehicle tire placard or certification label. These actual weights are also what should be used to determine any increase in inflation pressure for the tires, if required.

Inflation pressure recommendations may also be determined based on the tire manufacturer’s specifications, which define the amount of inflation pressure necessary to carry a given load. These inflation pressures may differ from those found on the vehicle tire placard or certification label.

However, never use inflation pressures lower than specified by the vehicle tire placard, certification label or owner’s manual. Nor should inflation pressure exceed the maximum pressure molded on the tire sidewall.

[anijet]

CALinSC, Since it is a 2004 year Doubletree unit I suspect it was delivered with 16" wheels and the data plate will reflect pressure for a G rated tire. If true, not useful at all.

[monaj02@frontier.com]

Originally Posted by anijet

CALinSC, Since it is a 2004 year Doubletree unit I suspect it was delivered with 16" wheels and the data plate will reflect pressure for a G rated tire. If true, not useful at all.

Yes it came with 16” Goodyear G 614 replaced with 17.5 Rainer 6000pound and some at 125 psi my axel weight is 12,000 pounds on 7k a axels my rims are rated over 4,000 pounds my question is how much psi in trailer tires

[CALinSC]

Originally Posted by monaj02@frontier.com

Yes it came with 16” Goodyear G 614 replaced with 17.5 Rainer 6000pound and some at 125 psi my axel weight is 12,000 pounds on 7k a axels my rims are rated over 4,000 pounds my question is how much psi in trailer tires

The information on that 2004 certification label is just as valid today as it was then.

Without DRV options or approval to use 17.5" tires, they are a misapplication.

The RVIA 10% load capacity reserve recommendation is not retroactive.

[Cummins12V98]

Originally Posted by monaj02@frontier.com

Yes it came with 16” Goodyear G 614 replaced with 17.5 Rainer 6000pound and some at 125 psi my axel weight is 12,000 pounds on 7k a axels my rims are rated over 4,000 pounds my question is how much psi in trailer tires

Use the inflation chart and add 5psi, very simple!!!

[Cummins12V98]

Originally Posted by CALinSC

The information on that 2004 certification label is just as valid today as it was then.

Without DRV options or approval to use 17.5" tires, they are a misapplication.

The RVIA 10% load capacity reserve recommendation is not retroactive.

INCREDIBLE! You must be a Government Employee.