2019 LaCrosse: Wrong tires per online owner's manual?

[bbqbailey]

I just had another tire blow. The cold pressure at start of trip was 80 psi, which is max load pressure per Goodyear for Endurance ST235/75R15.



This is the 3rd tire that has blown in the past 12 months. All were verified before pulling out as being at 80 psi. The oldest tire is now 4 years old (the other three have been replaced with new Enduranc), and has 8,650 miles on it.


I'm beginning to think the load is too much for the tires. My manual is back in my TT, round trip 100 miles, so went online. The online owner's manual says 2019 La Crosse has ST235/80R16. My tires and rims are ST225/75R15, which came from the factory, which I bought new in 2019. I have replaced tires, as they blew, but never replaced rims, which were stock from factory.



There's considerable difference in the max load between the two tires. The Endurance R15 has a max load of 2830 at 80 psi vs 3420 for the R16, a difference of about 400lbs/tire.



Anyone else have issues or discrepancy with tires on trailer vs owner's manual?

 

[wmtire]

I just had another tire blow. The cold pressure at start of trip was 80 psi, which is max load pressure per Goodyear for Endurance ST235/75R15.



This is the 3rd tire that has blown in the past 12 months. All were verified before pulling out as being at 80 psi. The oldest tire is now 4 years old (the other three have been replaced with new Enduranc), and has 8,650 miles on it.


I'm beginning to think the load is too much for the tires. My manual is back in my TT, round trip 100 miles, so went online. The online owner's manual says 2019 La Crosse has ST235/80R16. My tires and rims are ST225/75R15, which came from the factory, which I bought new in 2019. I have replaced tires, as they blew, but never replaced rims, which were stock from factory.

There's considerable difference in the max load between the two tires. The Endurance R15 has a max load of 2830 at 80 psi vs 3420 for the R16, a difference of about 400lbs/tire.

Anyone else have issues or discrepancy with tires on trailer vs owner's manual?

Next time you are at your RV, glance at that sticker on the side of the RV that has the tire size/load psi. Confirm what it says with what you got as well as the weight of the RV. I have heard where dealers swap tires/rims from one RV to another.

Many (but not all) RV's with 16" rims will have 8 lug rims.....and I highly doubt your RV has 8 lugs. Maybe 6 or 5.

Exactly what 2019 model number/floorplan Lacrosse do you have?

 

[NXR]

Tires very rarely just blowout. If you have any pics of the failed tires please post them here.

Ray

 

[bbqbailey]

I drove up to storage and verified the info on side of trailer. It does show ST225/75R15E, with 80 psi for max load, which is what all of my tires have been.


It also shows a max weight of cargo not to exceed 3047 lbs.


So, I guess my next step is to get my trailer weighted.



I'm also going to research whether or not I can get 16" rims and tires that will fit my studs.



We have noted that the Interstates we've been traveling on have been in terrible condition, with a lot of jarring impacts.



Thanks for the responses!

 

[bbqbailey]

This is what the blowouts look like.

 

[NXR]

That looks like you may have driven a while with the tire flat. Did that happen?

Ray

 

[bbqbailey]

No, I have a TPMS - it alarmed slightly behind the 'pop' sound we heard, and immediately pulled over in the emergency lane.

 

[NXR]

So your second sentence in your first post where you wrote 235 was a typo and it should have been 225?

What does "per Goodyear" mean? The maximum cold pressure is molded into the tire sidewall so that's kind of odd phrasing.

So you have one four year-old Endurance and the other three are new in the last year? Is it only the old tires that are popping?

When one tire on a side goes flat it is now carrying 100% of the weight on that side instead of roughly 50% and is now massively overloaded. Do you have any guess as to whether that is a factor?

Please post a pic of the stickers showing the weights and axle GAWRs. You can blot out the VIN if you want; it's not relevant.

Ray

 

[bbqbailey]

I just checked, and you are correct: the actual tires on my trailer are 225. I tried to find a way to edit after you pointed this out (thanks!), but I do not see an ability for me to do this.

 

[bbqbailey]

Re 4 years old tires popping: yes, only the tires that were bought as replacements to the original tires have been blowing. Of the three replacement tires, the oldest is one year old, with the other one being just a month old. The third, tire, which just blew a couple of weeks ago, has not yet been replaced; I expect to do so next week.

 

[bbqbailey]

I don't have a picture, and it's about 100 miles for a round trip, so I"m not going to do this. I posted the info previously that was on the side sticker.

 

[NXR]

I just checked, and you are correct: the actual tires on my trailer are 225. I tried to find a way to edit after you pointed this out (thanks!), but I do not see an ability for me to do this.

Yes, there is a very short period of time, maybe an hour or two, unlike other forums. We just all deal with it.

Re 4 years old tires popping: yes, only the tires that were bought as replacements to the original tires have been blowing.

Of the three replacement tires, the oldest is one year old, with the other one being just a month old. The third, tire, which just blew a couple of weeks ago, has not yet been replaced; I expect to do so next week.

Something is definitely wrong there, obviously.

I don't have a picture, and it's about 100 miles for a round trip, so I"m not going to do this. I posted the info previously that was on the side sticker.

Understood about the drive. Mine is in the driveway but I still took pictures of all the stickers 'cause I'm lazy.

The numbers from the sticker I'm looking for are the GVWR (gross vehicle weight rating) and each axle's GAWR (gross axle weight rating).

Without knowing at least the axle GAWR numbers and the exact tires you're installing there's no way to know if the tires are rated properly.

wmtire, who owns his own tire shop, asked for the exact model number of your 2019 LaCrosse but I do not think you responded with that information.

With that info, people normally could look up what your GVWR and GAWR are.

Yours could be 32' long or almost 38' long but the PrimeTime brochure, of course, does not list the axle GAWRs for each model: https://library.rvusa.com/brochure/2019-PrimeTime-LaCrosse.pdf

Hope this helps explain the reason for the questions. We may be able to figure out the GAWRs with the model number.

As an aside, since yours is a 2019 model year there is another possibility. As I recall, the RVIA made a standards change effective Sept. 1, 2018 to their tire requirements. RV's built prior to that date could use tires that, when inflated to the sidewall pressure, would barely support the axle GAWR.

RV's manufactured on and after that date needed factory tires that had at least a 10% safety margin. So it's not beyond the realm of possibility that even if you inflate the tires to the sidewall pressure, which you should be doing, your tires are overloaded because the RV is either overweight OR has a left-right weight imbalance.

A friend has a fifth wheel there there is a 28% weight imbalance on one axle. When you use a CAT Scale the result is the AVERAGE weight on each tire. For example, if one tire carried 2,000 lbs and the other tire carried 2,800 lbs, the CAT scale would show 4,800 lbs.

4,800 lbs divided in half would lead many people to think each tire was carrying 2,400 lbs. In actuality one tire is carrying 2,800 lbs or 15% more that the owner thinks.

Under-inflating a tire by 15% can cause premature failures. ("Under-inflating" can be caused by the RV design being lopsided.)

Details matter in these situations.

Ray

 

[oneflexyjeep]

Goodyear issues

I switched out my factory castle rock tires on my rockwood fifth wheel since they were 4 years old. I had zero problems with them. I installed Good year endurance. In two camping seasons in the Midwest I had one flat, one with a broken belt( they said I hit something) and one blow out. In my opinion the good year endurance has issues.

 

[tomkatb]

We have the commercial Goodyear tires.

They are built to last forever. G614’s as I remember.

But, they are expensive. Toughest 16” tire I suspect.

 

[Tireman9]

I just had another tire blow. The cold pressure at start of trip was 80 psi, which is max load pressure per Goodyear for Endurance ST235/75R15.
This is the 3rd tire that has blown in the past 12 months. All were verified before pulling out as being at 80 psi. The oldest tire is now 4 years old (the other three have been replaced with new Enduranc), and has 8,650 miles on it.
I'm beginning to think the load is too much for the tires. My manual is back in my TT, round trip 100 miles, so went online. The online owner's manual says 2019 La Crosse has ST235/80R16. My tires and rims are ST225/75R15, which came from the factory, which I bought new in 2019. I have replaced tires, as they blew, but never replaced rims, which were stock from factory.
There's considerable difference in the max load between the two tires. The Endurance R15 has a max load of 2830 at 80 psi vs 3420 for the R16, a difference of about 400lbs/tire.
Anyone else have issues or discrepancy with tires on trailer vs owner's manual?

This is another example of why it is a good idea to have a picture of your Certification Label on your phone. There is a lot of important on that sticker including GAWR and tire size, Load Range and cold inflation pressure.


BTW do you have any pictures of the failed tires? Might be able to provide a probable reason for the tire failure if we had a couple of well lit pictures.

 

[Wes12345]

Tire Pressure?

I’m not familiar with your rig but what caught my attention was your statement that the tires are at 80 psi which is the max. Tire pressure for Endurance tires is based on the weight of the trailer and the number of tires. In my case, my 5th wheel (4 tires) weighs in at 8000 lbs. Base on the tire pressure chart, the correct psi is 65. My guess is you are running them at too high of a pressure for your rig. You can locate the chart on line if you do a search for it. Like I said, I’m guessing but hopefully this will lead you to an answer.

 

[billgb]

Do you jacknife your trailer hard when parking it. I was having blowouts on regular basis - turns out I was breaking down the sidewalls by jacking the trailer hard (dragging the tires sideways)

 

[hicksie]

I just had another tire blow. The cold pressure at start of trip was 80 psi, which is max load pressure per Goodyear for Endurance ST235/75R15.



This is the 3rd tire that has blown in the past 12 months. All were verified before pulling out as being at 80 psi. The oldest tire is now 4 years old (the other three have been replaced with new Enduranc), and has 8,650 miles on it.


I'm beginning to think the load is too much for the tires. My manual is back in my TT, round trip 100 miles, so went online. The online owner's manual says 2019 La Crosse has ST235/80R16. My tires and rims are ST225/75R15, which came from the factory, which I bought new in 2019. I have replaced tires, as they blew, but never replaced rims, which were stock from factory.



There's considerable difference in the max load between the two tires. The Endurance R15 has a max load of 2830 at 80 psi vs 3420 for the R16, a difference of about 400lbs/tire.



Anyone else have issues or discrepancy with tires on trailer vs owner's manual?

I would replace the tires with at least one load range higher if not two. I was experiencing similar issues with my 5er the first two years. The trailer came with Load range E tires from the manufacturer. I replaced the tires with Load Range G, had them balanced and installed TPMS. That solved the problem

 

[Tireman9]

This is what the blowouts look like.

Thar looks like an "ROLF" Sidewall Run Low Flex failure because the tire was run while "Flat" or extremely low on air. A properly programed TPMS would have warned you of the air leak and probably allowed you to stop and fix the problem before destroying the tire. This is an example oh how a TPMS can pay for itself with a single "warning"

 

[NXR]

That looks like an "ROLF" Sidewall Run Low Flex failure because the tire was run while "Flat" or extremely low on air. A properly programed TPMS would have warned you of the air leak and probably allowed you to stop and fix the problem before destroying the tire. This is an example oh how a TPMS can pay for itself with a single "warning"

That's what I thought and then the OP said in post #7 they heard the "pop" and the TPMS went off. But I did not think to ask what the Low Pressure alarm was set to.

bbqbailey, do you know what the Low Pressure Alarm was set to? If you were running the tires at 80 PSI then the Low Pressure alarm could be set to 72 PSI or a loss of 10% of the air.

A loss of 20% means the tire is technically flat and susceptible to internal damage. Yes, 64 PSI in the tires would be considered flat if they are supposed to be at 80 PSI.

(I know the "flat pressure" is based on the exact weight the tire is supporting but we only know what the OP was running the pressures at.)

Ray