OEM rims rated for 110psi?

[Mikelff]

I have a 2018 Montana High Country 358BH. 41’, Anyone know if the OEM rims are rated for 110psi? Where on the rim would you find the psi rating stamp? I’m sure I’ll be crawling under there to look for it. Sure don’t want to pull the tire to look for it if I don’t have to. Thanks!

[2 Yoopers]

It’s stamped on the inside of the rim.

[beeje]

Just looked at a friends (new to him ) 2010 Montana. I could see the 3750lbs 110psi rating on the back side of the wheel spoke without removing it.

It has been reported in multiple places on this forum that all montanas from 2010 forward have 110psi rated wheels.

[Mikelff]

New to forum so thanks for the info.

[432bartman]

Learning something new everyday. I never knew the rims indicate a tire pressure. I just thought it was only on the tires. Thanks for the info.

[Mikelff]

Just spoke with my area factory Montana sales rep. The new High Country units now come with F rated tires. The Montana units are now coming with G rated tires. F rated tires are 12 ply, G rated are 14 ply. Being new to the forum, I had already replaced my China bombs with the Goodyear Endurance E rated tires that were the tire size and rating originally shipped on the unit. He also said to confirm the psi rating on the back of the rim. He will check to make sure my factory rims will take a G rated tires. As long as the rims will handle the G rated tire he saw no reason not to use them. So Montana did upgrade their tires to meet the new specs.

[Creeker]

The HC's have been coming from the factory with F rated tires since at least 2018. We looked at dozens before settling on our '19 model. All of them had F rated tires. If I recall correctly all were Rainier brand. I know all '19s were Rainier ST 235/80/16's. Rated for 3860lbs at 95psi. 81 MPH speed rating.

[Mikelff]

Originally Posted by Creeker

The HC's have been coming from the factory with F rated tires since at least 2018. We looked at dozens before settling on our '19 model. All of them had F rated tires. If I recall correctly all were Rainier brand. I know all '19s were Rainier ST 235/80/16's. Rated for 3860lbs at 95psi. 81 MPH speed rating.

Must have changed sometime mid year after my 2018 model was made if they made the switch in 2018. My label says ST 235/80/16E. Just my luck. Good info.

[sourdough]

IMO opinion those E rated tires should come off. They appear to have come on the trailer prior to the new RVIA recommendation of a 10% cushion (LRF). The Es will get you in trouble and was a primary driver IMO of why so many OEM tires failed continually - they were overloaded due to underrated tires from the factory. My HC came with LRF Raniers. They were replaced with Sailun S637 tires before it left the lot. I would highly recommend you do the same or at least get LRF tires. My wheels were rated for 110 psi. Look on the back of the rim, sometimes on a spoke. I've had the stamped with psi and/or load ratings.

[CalandLinda]

Originally Posted by sourdough

IMO opinion those E rated tires should come off. They appear to have come on the trailer prior to the new RVIA recommendation of a 10% cushion (LRF). The Es will get you in trouble and was a primary driver IMO of why so many OEM tires failed continually - they were overloaded due to underrated tires from the factory. My HC came with LRF Raniers. They were replaced with Sailun S637 tires before it left the lot. I would highly recommend you do the same or at least get LRF tires. My wheels were rated for 110 psi. Look on the back of the rim, sometimes on a spoke. I've had the stamped with psi and/or load ratings.

I've researched the OPs trailer's specs and I'm convinced the vehicle's certified axles are 6400#. A picture of the vehicle certification label would confirm that.

With the axles set a 6400# the OEM ST235/80R16 LRE tires would qualify for the 10% reserve load capacity.

For many years Keystone has played the number's game with the ST235/80R16 LRE tires. Those tires are manufactured with 3 distinct load capacities, 3420#, 3500# & 3520# all @ 80 PSI.

Because (officially) the minimum vehicle tire standard is set with the information provided on the vehicle certification label, the OPs tires were probably 3520#. That would make the Endurance ST trailer tires unsuitable for replacing the OEM tires because their load capacity is 3420#.

It's a common error for consumers to read a trailer's brochure which will tout 7000# axles and load the trailer accordingly. Theoretically the vehicle would then be 1200# overweight and the OEM tires would be at great risk of failure.

That's the primary reason I always refer to trailer axles as being vehicle certified. The GAWRs listed on the vehicle certification label depict the maximum load capacity for that vehicles axles.

[Mikelff]

Originally Posted by CalandLinda

I've researched the OPs trailer's specs and I'm convinced the vehicle's certified axles are 6400#. A picture of the vehicle certification label would confirm that.

With the axles set a 6400# the OEM ST235/80R16 LRE tires would qualify for the 10% reserve load capacity.

For many years Keystone has played the number's game with the ST235/80R16 LRE tires. Those tires are manufactured with 3 distinct load capacities, 3420#, 3500# & 3520# all @ 80 PSI.

Because (officially) the minimum vehicle tire standard is set with the information provided on the vehicle certification label, the OPs tires were probably 3520#. That would make the Endurance ST trailer tires unsuitable for replacing the OEM tires because their load capacity is 3420#.

It's a common error for consumers to read a trailer's brochure which will tout 7000# axles and load the trailer accordingly. Theoretically the vehicle would then be 1200# overweight and the OEM tires would be at great risk of failure.

That's the primary reason I always refer to trailer axles as being vehicle certified. The GAWRs listed on the vehicle certification label depict the maximum load capacity for that vehicles axles.

The label on the rig says the axles are rated at 3173 KG, 7000 pounds. Tires coming off and replaced.

[beeje]

Make sure you take the time to handle each different tire so you can compare what comes off the what's going on. The difference should be substantial

[Mikelff]

Originally Posted by beeje

Make sure you take the time to handle each different tire so you can compare what comes off the what's going on. The difference should be substantial

Not sure I understand what you mean. You talking about weights of the tires?

[beeje]

The way I read it you were replacing the tires on the camper

[Mikelff]

Originally Posted by beeje

The way I read it you were replacing the tires on the camper

Yes, that is the plan.

[beeje]

That's what I thought. So yes I meant make sure you pick up an old tire and compare it to whatever you're putting on. If you're putting on G,s the different should be substantial

[Mikelff]

Originally Posted by beeje

That's what I thought. So yes I meant make sure you pick up an old tire and compare it to whatever you're putting on. If you're putting on G,s the different should be substantial

Lucky me. Discount tire will give me full credit for the two new tires I bought last Thursday, and pro rate the third tire I had to buy two weeks ago. The 4th tire might be a spare, have to see what they say. 😎

[Mikelff]

Originally Posted by beeje

Just looked at a friends (new to him ) 2010 Montana. I could see the 3750lbs 110psi rating on the back side of the wheel spoke without removing it.

It has been reported in multiple places on this forum that all montanas from 2010 forward have 110psi rated wheels.

Just an FYI, the psi rating was on every spoke of the wheel. Just got back from crawling under the rig. Now have to find some new tires.

[Mikelff]

FYI, was just under the rig and there a tags on the axles that also say they are rated at 7000 lbs. Thanks for doing the math, but new tires going on so really don’t have to worry about it. Stay safe!

[beeje]

Originally Posted by Mikelff

Just an FYI, the psi rating was on every spoke of the wheel. Just got back from crawling under the rig. Now have to find some new tires.

I've never seen that on every spoke