Max psi

[old jim]

Do you all run the max rated psi on your trailer tires? If not why?? Regards, old jim

 

[90stingray]

Re: Max psi

Here we go again... another tire thread

Yes, i run max psi as the tire indicated... on my trailer and my vehicles.

 

[foodfisher]

Re: Max psi

Yes! Best tread wear and roadability.

 

[oregoncruiser]

Re: Max psi

Not falling for this one again! I'll let the self proclaimed experts (You know who you are!!! LOL!!!) advise you on this one!!

 

[MH Hawker]

Re: Max psi

I also run the rated PSI.

 

[elkhunter338]

Re: Max psi

I don't, never had a tire failure.
I run 30 psi on the wifes honda crv that has 44 psi max tires. Inside the door the car says 29 psi front/rear. Tires wear fine.
My truck 01 dodge diesel came with a tire inflation chart. I run psi according to the chart which tells you the recommended psi for the weight the tire supports. I wrote down the weight on the front and rear axles under different loading conditions, basically adjust seasonally to fit my needs.

The only time I run the full 80 psi in the rear tires is with the camper because I am running about 6100lbs on the rear axle.
I have 50k plus on the factory tires and they still have probably 20k or more worth of tread.

 

[Al Kungel]

Re: Max psi

Max pressure.

 

[roscoe]

Re: Max psi

Max pressure on trailer tires.
This is what the tire manufacturers recommend.
Trailer tires are not shock absorbers.
They need the pressure to support the sidewalls.

Run trucks at door panel sticker pressures.

 

[tpenfield]

Re: Max psi

I don't run quite at the maximum . . . because it is the maximum. Of course I don't run at the 'minimum' either . . .

 

[H20Rat]

Re: Max psi

(everything below applies mainly to bias ply tires... It affects radials to some extent, but this is a weakness of bias)

The idea is to maintain the sidewall and contact area. The max PSI rating is designed so the contact patch and sidewall deflection are ideal at max loading. If you have 1/4 of the max weight and inflate to max psi, your sidewall won't be deflected much, and your contact patch is going to be tiny. (ie, its actually a very dangerous condition with very little lateral traction)


I'm not advocating that for 1/4 load, you run 1/4 of max pressure. It is NOT a linear scale. But if you have a tire that is rated for 1000 pounds at 90 psi, you can run 70 psi if you have 250 pounds on it with zero issue. And yes, some manufacturers will just say run max psi no matter what, simply because you won't get sued from an ill-handling trailer.

(something else to keep in mind, wheels often have a max PSI, and if you have a tire rated for 90 psi, there is a chance the wheel is not rated for that... You NEVER exceed the wheel rating, no matter what.)

 

[ricohman]

Re: Max psi

Max PSI on trailer tires. They run much cooler and live a longer life as a result.
Doesn't matter what the sticker on your car or truck says as this is a trailer tire.

 

[bigdee]

Re: Max psi

Max PSI on trailer tires. Then run much cooler and live a longer life as a result.
Doesn't matter what the sticker on your car or truck says as this is a trailer tire.

I have to agree. True, the load is factored in but why experiment when the manufacturer says to inflate to max. The tread contact area is not that much of a concern on a trailer... whether you have 5 inches of tread or 3 inches of tread the total amount of contact weight to tread area ratio is still the same. The goal here is to minimize tire flex.

 

[Silvertip]

Re: Max psi

This isn't even about tire contact patch, sidewall flex, or any of the other issues regarding trailer tires. A trailer has a maximum GVWR and the tires and springs determine what that GVWR is. Yes - you can run less air in a trialer tire if it is not loaded to the GVWR. Yes you can run them at max PSI as stated on the sidewall. The Question is -- why would you bother continually screwing with air pressure when the trailer rarely moves when the boat is not on it since it is sitting in the parking lot. Set the air pressure for the load you carry plus a margin. Or -- set it at max PSI and forget about adjusting the pressure as you add extra gas cans, bigger coolers, more gear, etc. There is more of a chance of ruining a tire through under inflation than there ever will be by inflating to the sidewall pressure. And what you do with your car or truck is very different than what you do with a trailer as was pointed out.

 

[Cruzomatic]

Re: Max psi

50 psi..

 

[cribber]

Re: Max psi

I fill them to whatever the manufacture says is max and when they lose 10% of rated pressure I fill them back up. Throw in nitrogen and its almost like set it and forget it If your tires are sound and you have no leaks.

 

[Navigator_Victory]

Re: Max psi

within two pounds of max just in case the gauge is off speaking of which how would you know if your gauge was good unless you compared it to another gauge and what if it was also bad......I thought about inventing a gauge tester which of course would simply be a tank of air that would pressurize to the proper pressure.....well cat is out of the bag now someone go invent it and make a million just remember where you saw it

 

[Harritwo]

Re: Max psi

I run max on the trailer and i run 35 on the truck for ride comfort. Truck tires are 44 psi, First set run over 65k second set run 60k, this is the third set, just put them on. The trailer is a 94, Put the second set on 2 years ago due to dry rot, then again, i tow only to the local ramp nearly every weekend, A distance of about 7 miles each way. They do not see a lot of highway except once a year, then i tow about 150 miles each way.