PSI Rating of Rim

[Quantum]

I'm looking to buy new tires for my Whitehawk. I have 2 long trips happening this year, each about 5,000km and I still have the original Rainier tires on my trailer.

I see Sam's club has the GY Endurance 225/75R15 LRE on for $100.99 per tire (incl. manuf. rebate) and they are rated for 80PSI.

I currently have 225/75R15 LRD on my trailer which are rated for 65PSI.

I've read that rims have different PSI ratings. How do I know what rating my alloy OEM rim has?

[Quantum]

So I went to the rim manufacturers website (Sendel) and found my trailer rims are rated for 80PSI.

[pawpaw]

The rims should have their rating stamped into the metal on either the inside or outside of the rim. Sometimes it's hard to see. For an 80 psi tire you need a rim stamped 2,830 lbs or greater.
I just went through this. I upgraded to 80 psi tires from the 65 psi factory tires. I had two rims develop cracks in the welds, and after a lot of research I discovered that my rims were rated for 2,600 lbs - that's only good for 65 psi. You also need to upgrade the valve stems to high pressure units.
Good luck!

[Woodworker]

Very interesting thread. Not that I have thought about changing the tires I have yet but I would not have never thought about checking the rims for psi rating.
Learn something new everyday

Sent from my SM-G900V using Tapatalk

[RedHorse1]

I bought G’year 614’s a couple of years ago and discovered my rims were only rated for 80psi (the 614 can go to 110psi). I carried 100psi and lost sleep over it until I upgraded the rims. The 614 is a $$$ tire but they’ve been solid. But if I were doing it now I’d probably go the G’year Endurance route.

[Quantum]

Just looked at my rims to confirm, they are Sendel T09. Pics attached.

I ordered Carlisle HD 225/75R15 LRE to replace my Rainier LRD.

$67.00/e at Walmart and decent reviews on the RV forums for the new Carlisle HD.





Sent from my SM-G950W using Tapatalk

[Woodworker]

Originally Posted by Quantum

Just looked at my rims to confirm, they are Sendel T09. Pics attached.

I ordered Carlisle HD 225/75R15 LRE to replace my Rainier LRD.

$67.00/e at Walmart and decent reviews on the RV forums for the new Carlisle HD.





Sent from my SM-G950W using Tapatalk

Carlisle worked great on our pop up. Went from blowing 1 tire every year to goin the last 5 yrs before I sold it with no problems

Sent from my SM-G900V using Tapatalk

[wabirch]

Couldn't get a clean shot of the mold markings, hope Jayco customer service gives me good news that my 9,500 gross isn't only supported by the 65psi wheels. Upgrading to the Endurance may have gotten a few hundred more expensive with new wheels.

[curver900]

Originally Posted by Quantum

I'm looking to buy new tires for my Whitehawk. I have 2 long trips happening this year, each about 5,000km and I still have the original Rainier tires on my trailer.

I see Sam's club has the GY Endurance 225/75R15 LRE on for $100.99 per tire (incl. manuf. rebate) and they are rated for 80PSI.

I currently have 225/75R15 LRD on my trailer which are rated for 65PSI.

I've read that rims have different PSI ratings. How do I know what rating my alloy OEM rim has?

you don't need to air up your E rated tires to max psi you only need to air them up the weight you will be carrying... if those were D rated tires you are replacing the E rated tires will actually require less PSI to manage the same load...

here is the link..

RV Tire Safety: Load Inflation table

[Bassdogs]

Rather than do all this jumping thru hoops, wouldn't it be easier to just buy better rated replacement tires in the same range as the OEM's ? Or stay within the PSI rating on the rims. To me it makes more sense to replace tires after 3 or 4 [max] years and do some research to get better rated replacements. Not RV related, but all the time I hear people with basic SUV's who are upgrading their tires to Z [hi performance] rated tires. They typically are using the same logic as on this thread, higher is better even if the lesser rating is more than adequate for their TT weight.

Do what you feel is necessary but don't get sucked into the "I need higher rated" group when all you need is to get fresh rubber for another 3-4 years. You need to maintain that frequency of replacement regardless of the speed/weight rating.

[Bassdogs]

Originally Posted by curver900

you don't need to air up your E rated tires to max psi you only need to air them up the weight you will be carrying... if those were D rated tires you are replacing the E rated tires will actually require less PSI to manage the same load...

here is the link..

RV Tire Safety: Load Inflation table

Just asking?? From everything I have been told, you should inflate your tires to the Max rating. Doesn't running 80psi tires at 65psi violate this rule?? Other than a defective tire, the biggest cause of tire failure is under inflation.

[Tumbleweed44]

Originally Posted by wabirch

Couldn't get a clean shot of the mold markings, hope Jayco customer service gives me good news that my 9,500 gross isn't only supported by the 65psi wheels. Upgrading to the Endurance may have gotten a few hundred more expensive with new wheels.

9500-10% tongue weight=8550. 8550/4=2137.5, on a rim rated around 2600 lbs. That seems reasonable to me.

[Sundancer330]

Originally Posted by Bassdogs

Just asking?? From everything I have been told, you should inflate your tires to the Max rating. Doesn't running 80psi tires at 65psi violate this rule?? Other than a defective tire, the biggest cause of tire failure is under inflation.

I talked to a Goodyear engineer before buying the Endurance tires last summer, he said no matter what always run at the max pressure because thats how the tire was designed to give the best performance and safety.

[wabirch]

Originally Posted by Tumbleweed44

9500-10% tongue weight=8550. 8550/4=2137.5, on a rim rated around 2600 lbs. That seems reasonable to me.

Agreed. Since the Endurance was an option for 2017, sure hoping the wheels are identical for either build.

[Quantum]

Since I have the ability to run E rated tires on my trailer and they were only $6/tire more, I might as well.

I will run them at 75PSI on my March trip since I will be starting up here in Canada. As I get further south and the temps rise, I'll have some buffer and they will likely be around 80PSI by the time I hit South Carolina.

[ALJO]

Quantum just to remind you: Tire manufactures recommend trailer tires to run at max cold inflation (which is already mentioned), which doesn't mean O they will get to 80 psi when they warn up...............wrong thinking!

[Quantum]

Originally Posted by ALJO

Quantum just to remind you: Tire manufactures recommend trailer tires to run at max cold inflation (which is already mentioned), which doesn't mean O they will get to 80 psi when they warn up...............wrong thinking!

What I was thinking was that if I start at 75PSI (cold) here in Ontario, then the next day when I wake up in South Carolina, my tires will likely be 80PSI (cold) since the warmer climate.

I don't want to have to deflate my tires as I head south, so I figure air it under the max by about 5PSI when cold and I should be good the entire trip down to Florida.

Is that more clear way of putting it? This is what I did with my old trailer which had LRC tires (max 50psi). I would inflate them to 45 or so and then when I was in Florida they would be at 50 (cold).

When I camp in Ontario in the summer, I just air up to the max and leave it all season. I only do this when doing our March break getaway which can easily see a climate temp change of 70 degrees between Ontario and Florida.

[Atlee]

To say the Endurance tires were optional in 2017 is using the term "optional" very loosely. When I've looked at the 2017, the Endurance tire is always noted as a "mandatory" option. This means you pay more for the tires on the trailer, but you can't get a lessor tire at no cost, hence mandatory.

But on my 2017 23RB, the "mandatory option" Endurance ST205/75R15 LRD tires are on Sendel aluminum wheels with a 2150# max which equals the 2150# of the tires that are on the trailer.

Originally Posted by wabirch

Agreed. Since the Endurance was an option for 2017, sure hoping the wheels are identical for either build.

[CampNow]

Originally Posted by Bassdogs

Just asking?? From everything I have been told, you should inflate your tires to the Max rating. Doesn't running 80psi tires at 65psi violate this rule?? Other than a defective tire, the biggest cause of tire failure is under inflation.

Originally Posted by Sundancer330

I talked to a Goodyear engineer before buying the Endurance tires last summer, he said no matter what always run at the max pressure because thats how the tire was designed to give the best performance and safety.

Some tire manufacturers produce load/inflation charts for a reason. There are tangible benefits, with no loss in safety or reliability, to be gained by inflating tires based on a legitimate load/inflation chart. Tires inflated like this ride smoother and wear more evenly.

However, there's one huge caveat in terms of travel trailers. The OEM tires and axles installed on most travel trailers barely support the GVWR---unlike the car industry which typically uses tires that exceed the vehicle's GVWR. This is why car manufacturers typically recommend tire inflation pressures lower than the maximum tire inflation pressure noted on the sidewall of the tire---they use over-rated tires. This is also why, IMO, tire failures are much more common with travel trailers than cars.

Lastly, even if the travel trailer industry used tires that exceeded the GVWR, there are very few travel trailer owners that CAT scale their trailers (under all load conditions) to obtain accurate tire load data. The odds for misuse of load/inflation charts would be high, regardless. For the greater good of the whole (and to reduce liability issues), probably better to have everyone inflate their travel trailer tires to the maximum inflation pressure. In the grand scheme of things, issues like a rough ride and uneven tire wear are just small stuff.

[Bassdogs]

just max the rated psi and forget the hooie. you are not worried about ride comfort in a tt. max psi = max weight load. dont overload the rv and you are good to go.