Tire Replacement and Trailer Weights

[PistonSlap]

Originally Posted by jamaddox

Finally able to get under my trailer and I did not find out the PSI but found some wheel codes. Oddly enough I found both an 02 and 09. Although the 09 was followed by 21

Attachment 47685Attachment 47686

Were you able to look behind the spokes?

[jamaddox]

Most was blocked by the brakes and where it was bolted to the axels but look at these

[BrentB]

Originally Posted by Tireman9

Yes get metal bolt in valves.

I see they come in various wheel hole sizes. Is there a way to tell what size I need ahead of time?

[ShawnR]

My wheels were load stamped on the inside. I don’t remember the numbers exactly but there are two. One for 5 hole wheels and one for 6 hole. I have 6 hole wheels and the weight stamped lined up perfectly with the load capacity for load E tires. So I can air up to 80 without risk of wheel failure.

[Lake Huron]

So, an 8 lug wheel is good for 120psi, a 6 lug wheel is good for 80psi, and I believe a 5 jug wheel is good for 65psi.

Let's say you got load D tires on it and you are going to upgrade to a load E tire and these are on 16 inch 5 lug wheels. You may be doing more harm for yourself.
2 things result in blowouts, impact and heat. Heat is made more commonly by overloading or under inflation, and lastly speed.

So, you put an E range tire on it that will handle higher loads, BUT that when its inflated to the max pressure of 80psi. It will not handle the max load at a lower psi in it (under inflation). An E range tire that's inflated to the max wheel pressure of 65psi will run really hot, have more drag going down the road which will make it run hot, cost you fuel mileage and will most likely blow out sooner than a properly inflated tire with a lighter load rating.

As far as the wheel being stamped with the max psi it can handle, I'm not saying wheels are not stamped but mine are not. I just bought a matching wheel to be used as a spare and just went and looked it over. There is nothing stamped on it with the max psi. It is stamped with the size, max load rating, date of manufacture, etc... everything BUT the max wheel psi. When I ordered it I asked Treddit what it was and they said it was 120psi.

[jamaddox]

I mentioned being stamped on the wheels because that is what treddit said. I don’t want to go to an E just to a D. I don’t like having the tires so close the edge of their capacity and 8 am also not sure about the stability of the OEM tires anymore

[NHstuckinGA]

Interesting comments and even better from Jayco. The comments you received from Jayco match my responses.
I was getting strange wear after (1) year and 6k+/-. Had an axle specialist inspect the axles, and they stated in writing "s**t tires."
My TT came with 225/75R-15 LR C @ 65 psi. I had Discount Tire replace the valve stems with stainless steel and all was good. Then had Discount Tire replace the Ranier with GY Endurance LR D @80 psi. Hence the discussion with Jayco on the AL cast wheels. Jayco said "no" to the 80 psi and the mfg (contacted by email and telephone) said; ready for this???; not sure!
Discount Tire inspected the wheels and based on the stampings (?) said, no problem.
We have 1 1/2 yrs and 11k on the tires @ 80 psi and it tows like a dream. I researched the tires, wheels, valve stems and TPMS carefully and am very very pleased with my purchases.

[ShawnR]

Originally Posted by Lake Huron

So, an 8 lug wheel is good for 120psi, a 6 lug wheel is good for 80psi, and I believe a 5 jug wheel is good for 65psi.

Let's say you got load D tires on it and you are going to upgrade to a load E tire and these are on 16 inch 5 lug wheels. You may be doing more harm for yourself.
2 things result in blowouts, impact and heat. Heat is made more commonly by overloading or under inflation, and lastly speed.

So, you put an E range tire on it that will handle higher loads, BUT that when its inflated to the max pressure of 80psi. It will not handle the max load at a lower psi in it (under inflation). An E range tire that's inflated to the max wheel pressure of 65psi will run really hot, have more drag going down the road which will make it run hot, cost you fuel mileage and will most likely blow out sooner than a properly inflated tire with a lighter load rating.

As far as the wheel being stamped with the max psi it can handle, I'm not saying wheels are not stamped but mine are not. I just bought a matching wheel to be used as a spare and just went and looked it over. There is nothing stamped on it with the max psi. It is stamped with the size, max load rating, date of manufacture, etc... everything BUT the max wheel psi. When I ordered it I asked Treddit what it was and they said it was 120psi.

I believe your first sentence best summarizes wheel load carrying capability and max PSI. Wheels are stamped with load limit and you can derive max PSI from that. For what it's worth, airing an E tire to 65 lbs is not under-inflated so long as the vehicle load is appropriate for a D tire and 5 lug wheel.
Please refer to the linked table from Goodyear regarding tire pressure and load carrying capability. I think it will clear the water. https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

[Texdan25]

Originally Posted by redenbacher

Now for the rest of the story. The Discount Tire website has the Goodyears for sale at $107 each. They were willing to give them to for the price they quoted for the Maxxis, which was $92 each. When I told them the Maxxis has now been reduced further on their website to $80 each, they said they'd match that price. So, I getting four tires that could have cost me $107 each to only $80. I feel like I've got a good deal going there. As a side note, Discount Tire was the only retailer in the area selling Maxxis but there are a bunch of folks selling the Goodyear's.

Dang, wish I would have done that, I got mine a couple weeks ago at $102 ea. Glad I watched them put them on my White Hawk, they were gonna jack up the trailer via the axles and I stopped them since the manual says to use the frame. So they had to used blocks to get their jack high enough. Would jacking it up via the axles actually do damage? And they were trying to jack up both sides at once but were unable to do that, only did one side at a time.

[jamaddox]

Sorry my answers have taken so long. After some back and forth with Tredit they were able to confirm I have the Thoroughbred rims. There was no stamping on them but based of the picture I sent this is what we determined. Those rims in the size I have will support a max of 2200# with a max PSI of 65. Looking at the Goodyear endurance for the size I need (ST205/75R14C) then if I buy them from Tredit then the Endurance that matches those specs will have a max load of 2040 with a PSI of 65. If I could go to ST215/75R14 then I get a max load of 2200. Not sure that is possible because it is a different width and not sure I need it. Right now I have a margin of 280 per tire so an overall margin of 1120 which I hope should be adequate considering the GVWR of the trailer is only 7500 lbs.

[Tireman9]

Originally Posted by jamaddox

Sorry my answers have taken so long. After some back and forth with Tredit they were able to confirm I have the Thoroughbred rims. There was no stamping on them but based of the picture I sent this is what we determined. Those rims in the size I have will support a max of 2200# with a max PSI of 65. Looking at the Goodyear endurance for the size I need (ST205/75R14C) then if I buy them from Tredit then the Endurance that matches those specs will have a max load of 2040 with a PSI of 65. If I could go to ST215/75R14 then I get a max load of 2200. Not sure that is possible because it is a different width and not sure I need it. Right now I have a margin of 280 per tire so an overall margin of 1120 which I hope should be adequate considering the GVWR of the trailer is only 7500 lbs.

John, You quote your GVWR

What is your actual load on each tire position. It is entirely possible to have one tire supporting 2250 or more.
You can not take your GVWR and devide by the number of tires. Nor can you take your GAWR and assume a 50/50 side to side split. Almost no RVs have a weight split evenly between axles, nore have any axle load split 50/50 side to side.


Get thee to a scale where you can learn your actual tire loading whan the RV is at it's heaviest.

[jamaddox]

I have been to a scale with this trailer and a different truck. I know a I am under on the trailer but I have no way to weigh each individual wheel or axle. I am going to weigh again before my trip this summer but I plan on buying new tires before then. I mainly want to get something other than the tires that came with the trailer and a stronger one. I will see if I can’t find the previous scale ticket. The only issue might be that the hitch is set up to transfer less weight to the new truck. That I will need the scale for

[Atlee]

Originally Posted by Tireman9

John, You quote your GVWR

What is your actual load on each tire position. It is entirely possible to have one tire supporting 2250 or more.
You can not take your GVWR and devide by the number of tires. Nor can you take your GAWR and assume a 50/50 side to side split. Almost no RVs have a weight split evenly between axles, nore have any axle load split 50/50 side to side.


Get thee to a scale where you can learn your actual tire loading whan the RV is at it's heaviest.

My problem is there are no scales near me where I can weight each tire separately. That's the main reason I air all my trailer tires up to 65 psi. That way, I know I have a good margin of error on any given tire.

Worked fine on my 8900 mile trip to the Rockies in June and July of 2018. Tread is still looking good on my tires.

[jamaddox]

I could not find my scale ticket but from memory my trailer was around 6600lbs and I was over on my truck by 400lbs which is why I ended up with a new truck. I am not going to take the trailer out for another three weeks for summarizing which is when I will go to the scales and then get new tires. I can post back then

[Tireman9]

Originally Posted by Atlee

My problem is there are no scales near me where I can weight each tire separately. That's the main reason I air all my trailer tires up to 65 psi. That way, I know I have a good margin of error on any given tire.

Worked fine on my 8900 mile trip to the Rockies in June and July of 2018. Tread is still looking good on my tires.

Understand the problem. Have you at least learned the actual loaad on each individual axle?

[jamaddox]

Tireman9 I did the last time I weighed it. I can’t find the scale ticket so I will have to get it weighed when I take it in for service in about two weeks.

[Atlee]

No. The CAT scales up at the truck plaza has a pad for the front truck axle, rear truck axle, and the trailer axles.

The best I could do was weigh the truck sans trailer, but packed for the road. I then weighed the truck and trailer connected but without the WDH bars hooked, and finally with truck and trailer with the WDH bars engaged.

Originally Posted by Tireman9

Understand the problem. Have you at least learned the actual loaad on each individual axle?

[Tireman9]

Originally Posted by Atlee

No. The CAT scales up at the truck plaza has a pad for the front truck axle, rear truck axle, and the trailer axles.

The best I could do was weigh the truck sans trailer, but packed for the road. I then weighed the truck and trailer connected but without the WDH bars hooked, and finally with truck and trailer with the WDH bars engaged.

You can get individual axle weights, it just takes a 2nd weighing with differnet axle on the platform. Just let the scale master know what you are doing.