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Old 07-06-2022, 12:52 PM   #1
Nankipoo
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225/75/R15 Tires

Daughter and her husband are fixing to buy a 5'er if things work out with it. It's not a Keystone but the gross on it is around 12,000 pounds. It's been sitting on site in the owners yard for awhile and hasn't been moved. The tires are absolutely shot. If they buy it, it is only 1/2 mile from their house and I'm not sure the tires will make it that far. They are only 15 inch though. So E is the highest rating I'm seeing. Thinking of suggesting Carlisle Radial Trail HD or Goodyear Endurance. What are y'all's suggestions on a15 inch tire?
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Old 07-06-2022, 01:18 PM   #2
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Every tire I see of that size, endurance, Carlisle, Hartland, and Maxxis (the brands I would trust) will all be rated for 2830 lbs. If the GVWR is 12,000 and the trailer is maxed out, pin weight will be approximately 2600 lbs leaving 9400 on the tires Or 2350 each. Personally, I like to have more than 500 lbs of extra capacity available. I would change them out to a 16” wheel and look for LRF or LRG, I’d go LRF if it was mine.
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Old 07-06-2022, 01:47 PM   #3
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Originally Posted by bsmith0404 View Post
Every tire I see of that size, endurance, Carlisle, Hartland, and Maxxis (the brands I would trust) will all be rated for 2830 lbs. If the GVWR is 12,000 and the trailer is maxed out, pin weight will be approximately 2600 lbs leaving 9400 on the tires Or 2350 each. Personally, I like to have more than 500 lbs of extra capacity available. I would change them out to a 16” wheel and look for LRF or LRG, I’d go LRF if it was mine.
Carlisle builds an all steel ST225/75R15 with a load range "F". There are other brands that build it with a load range F & G.

https://www.carlislebrandtires.com/o...-detail/csl16/
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Old 07-06-2022, 01:53 PM   #4
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First have then check the wheels capacity. Most 15" alloy wheels are limited to 80 psi. That info should be found on the backside of the rim.
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Old 07-06-2022, 01:54 PM   #5
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Got more info. Dry weight 9662. Gross 11,650. Calls for a ST225/75D/15D tire.
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Old 07-06-2022, 02:18 PM   #6
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Carlisle Radial Trail HD or Goodyear Endurance are the popular choices. I use Carlisle as they have given me excellent service through several tire changes and cost a bunch less than Goodyear Endurance. I buy them via walmart.com online and have them shipped to the store. Toss them in my truck and pull my camper to a tire shop in Castroville where they install. I don't balance and I don't rotate. Others do.
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Old 07-06-2022, 02:24 PM   #7
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That doesn’t change things a whole lot. Depending on how you load, maybe 600 lb margin on an LRE. I’d still go to an LRF, but as mentioned check the rating on the wheels. LRF typically call for 95 psi. If the wheels aren’t rated for 95 psi, then you would need to upgrade those anyway so a 16” wheel would open the door some for tire size/rating. If you don’t want to upgrade wheels and the current ones are only rated for 80 psi, definitely get a quality LRE. No way I’d do LRD, that’s the way they used to send them out, maxxed out as soon as they rolled off the line.
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Old 07-06-2022, 02:29 PM   #8
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Originally Posted by Nankipoo View Post
Got more info. Dry weight 9662. Gross 11,650. Calls for a ST225/75D/15D tire.
The "D" after the 75 means the tire is bias ply. RVIA has recommended trailer tires with a diameter of 14" and above should be "R", radial ply.
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Old 07-06-2022, 02:35 PM   #9
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Do a search of OEM trailer tire and wheel assembly providers. Regulations require tire manufacturers to ensure the tires they build have available wheels to support the load and PSI requirements of the tire.
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Old 07-06-2022, 02:38 PM   #10
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Whatever happened to Maxxis? It used to be one of the top rated/recommended tires for RVs. Haven’t heard anything bad about them, but people don’t recommend them anymore. Is it just because they don’t make anything above LRE and so many people have larger trailers and we’ve gotten used to dealing with LRG and we’ve forgotten about them?
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Old 07-06-2022, 02:58 PM   #11
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Originally Posted by bsmith0404 View Post
Whatever happened to Maxxis? It used to be one of the top rated/recommended tires for RVs. Haven’t heard anything bad about them, but people don’t recommend them anymore. Is it just because they don’t make anything above LRE and so many people have larger trailers and we’ve gotten used to dealing with LRG and we’ve forgotten about them?
Maxxis is the only ST tire manufacturer that does not put a speed letter on their ST tires. Therefore, they default to 65 MPH.
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Old 07-06-2022, 03:15 PM   #12
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Why all this info to confuse the poor guy's initial question? Maxxis 8008 ST tires are available by order at Discount Tire and are about $160 a pop for the LRE ST225/75R15. That is why they don't seem all that popular today. They are price a bit more reasonably at walmart.com. I a pretty sure few will admit to using the once popular Maxxis brand tires.
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Old 07-06-2022, 03:52 PM   #13
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I think Maxxis kind of hit a point where their pricing was a bit high then combined with what I've seen as limited availability they kind of slid down the "druthers" chart. If I have a failure I want my brand of tire to be available readily at most types of places. I don't replace a tire at a time but instead the whole set when something happens to one or all so if other folks are like that availability weighs heavily....at least for me.

I'm thinking this RV was prior to the new RVIA tire recommendations so the tires will barely support the gvw minus pin weight. I like my tires to support the gvw plus at least 10% or more. In this case that would mean an F rated tire and I doubt those wheels will be rated for the weight and/or pressure. The choice then is new LRE 15" tires on the old wheels that would be rated to carry about 11,320 vs the 11,650 gvw (11,650 + 10% = 12,815) or new wheels rated to carry more along with tires. If replacing the wheels I would go with 16" if possible depending on what kind of hubs are on this trailer. LRFs would then be an easy choice and lots of selection. But then comes clearances etc.

From the sounds of it I would be replacing all the hub/brake assemblies anyway so might as well throw the tires and wheels in there as something that needs to be done to get it safe and roadworthy. IMO cosmetic stuff is one thing, safety stuff is another thing entirely that can't be put off.
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Old 07-06-2022, 05:56 PM   #14
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Thanks for all the replies thus far. Service is a hit and miss here and it's been gone awhile. Trying to keep up with the post.
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Old 07-21-2022, 07:15 AM   #15
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Look for a tire that has a tire load rating that provides a safe margin abouve your trailer weight / 4 and obtain the manufacturer's tire inflation/load rating chart to confirm.
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Old 07-21-2022, 08:00 AM   #16
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Look for a tire that has a dual tire load rating that provides a safe margin abouve your trailer weight / 4 and obtain the manufacturer's tire inflation/load rating chart to confirm.
What "dual tire load" rating are you refrencing? If you're talking about tires that have seperate inflation/weight loading when used as dual tires that's refrencing a truck tire for dual rear axle trucks and not for trailer service.
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Old 07-21-2022, 08:18 AM   #17
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Attached is an example inflation/load table. It is for the tires on my fifth wheel trailer. It shows the load for single and dual tires.
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Old 07-21-2022, 08:37 AM   #18
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Attached is an example inflation/load table. It is for the tires on my fifth wheel trailer. It shows the load for single and dual tires.
I've never seen "dualies" (2 tires mounted to a single spindle/hub) on an RV trailer so there is no need for a "dual rating".
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Old 07-21-2022, 08:42 AM   #19
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You are correct..........For a trailer look up its single tire load and corresponding inflation psig. For a truck or motorhome with with dual rear tires look up its ual tire load and corresponding inflation psig.
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Old 07-21-2022, 10:08 AM   #20
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What size tire are you guys running when going from a 15" wheel to a 16"? The smallest i see is about a 235/80r16 which is a couple inches taller than the 225/75r15. Is there a closer size for 16" wheel?
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