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Old 05-16-2021, 02:46 PM   #1
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TV Tire Pressure & RV Tire Pressure Q's

Hello All,
I have a 2020 Ford F250 and an Airstream 33' Travel Trailer. I've read a lot of discussion about tire pressure, but nothing real current. What I mean is, the newer F250 door column states for these Michelin tires now, 60psi front and 65psi rear. The tires max at 80psi on the sidewall which was my experience with prior year F250's on the door column too, but the tech at the dealership said they've changed and that with normal driving you can run 80psi, but harsher ride and you'll run the "middles out of them."

On to the Airstream. All four tires are Michelin LT225/75R16, Load Range E. The Airstream sticker says 80psi for these tires. I went up to my local Dobbs Tire Dealer and he pulled up the Michelin chart for these tires, and said with a trailer weight on dual axles of between 7980lbs and 8600lbs, you could run the pressure between 60 -- 65psi. I asked if I would have a problem with tire heat or wear and he said no. I did put a 3" lift kit on the Airstream, so as to have better clearance at gas stations and various road conditions. The dealer puts in 80psi, but from time to time I get popped rivets, (if ride is the cause).

My question is this: With an approximately 8200lb trailer, 1300lb hitch weight, and just me and some luggage, (300lbs of luggage), what would you recommend on tire pressure on both vehicles for mostly interstate driving, despite the door stickers, (if recommended)?
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Old 05-16-2021, 02:50 PM   #2
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I run my ‘21 Classic 33 at 80psi cold.

I run my ‘19 RAM 2500 Limited Diesel at 75psi cold.
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Old 05-16-2021, 03:06 PM   #3
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I run my '21 Classic 33 at 80psi cold.

I run my '20 GMC 3500HD Duramax at 60psi front / 80psi rear cold, as recommended on the sticker in the driver door.


If Goodyear or Michelin or Cooper or whoever says their tires can run at 80psi, then they are good at that pressure. Go for it. However, if Ford wants you to run at 65psi, then by definition, that pressure will be adequate for any load up to and including the maximum payload and trailer capacities of the truck. I choose to keep the differential pressures in my front/rear on my TV, as recommended by GM. Among other things, this differential helps counteract overseer that may result if a heavy trailer "pushes" the back end when going around a turn.
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Old 05-16-2021, 03:16 PM   #4
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When towing truck is at sticker 60F / 80R trailer running stock 15” Goodyear Endurance @ 65-70.

When not towing truck is at 60F / 70R
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Old 05-16-2021, 03:16 PM   #5
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Thank you so much.....as usual great information from the Airstream folks.
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Old 05-17-2021, 09:23 AM   #6
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I usually run about 5 lbs less than what the tire recommends on the truck and trailer. I have been using this method for about 50 years now without any tire failures due to heat. Heat is the #1 cause for tire failure. Running a tire low on pressure causes heat. Although, you are going to get answers all over the place. Some say use the recommended pressures on the door sticker. But I figure the tire manufactures know more about tires than car manufactures do.
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Old 05-17-2021, 09:47 AM   #7
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I run my 3/4 ton GMC passenger van when towing at 55 psi front and 80 psi rear. The is the max load figures as shown on my door sticker. When not towing I'll allow those rears to drop to 70.

My 30' Classic Slide out with its 16" Michelin Defenders are inflated to 80 psi. No popped rivets or any signs of over inflation.

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Old 05-17-2021, 10:52 AM   #8
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I bet if you look up load carrying of your tires at the pressures shown on the door, and multiply that weight by “2”, you will find that that number is equal to that axle’s gross. Ford, Chevy, etc will tell you the PSI is recommended for ride, tire wear, whatever. Not so, it’s all about liability.
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Old 05-17-2021, 12:24 PM   #9
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Tire pressure

As I walked around our new trailer, I noticed the Airstream sticker gave 80 psi max for the tires. I looked at the brand new Michelins and noticed the max cold pressure on the tire was 50 psi. Asked the dealer - the reply was to follow what is on the tire, not what is on the sticker - in this case run them at 44-45 psi.
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Old 05-17-2021, 12:56 PM   #10
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Quote:
Originally Posted by Waterbeach View Post
As I walked around our new trailer, I noticed the Airstream sticker gave 80 psi max for the tires. I looked at the brand new Michelins and noticed the max cold pressure on the tire was 50 psi. Asked the dealer - the reply was to follow what is on the tire, not what is on the sticker - in this case run them at 44-45 psi.
Curious as to what size and model Michelin tires you have?

Jack
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Old 05-17-2021, 03:03 PM   #11
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Michelin Defender LTX 235/75/R15
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Old 05-17-2021, 04:23 PM   #12
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Quote:
Originally Posted by starpicker View Post
Hello All,
I have a 2020 Ford F250 and an Airstream 33' Travel Trailer. I've read a lot of discussion about tire pressure, but nothing real current. What I mean is, the newer F250 door column states for these Michelin tires now, 60psi front and 65psi rear. The tires max at 80psi on the sidewall which was my experience with prior year F250's on the door column too, but the tech at the dealership said they've changed and that with normal driving you can run 80psi, but harsher ride and you'll run the "middles out of them."

On to the Airstream. All four tires are Michelin LT225/75R16, Load Range E. The Airstream sticker says 80psi for these tires. I went up to my local Dobbs Tire Dealer and he pulled up the Michelin chart for these tires, and said with a trailer weight on dual axles of between 7980lbs and 8600lbs, you could run the pressure between 60 -- 65psi. I asked if I would have a problem with tire heat or wear and he said no. I did put a 3" lift kit on the Airstream, so as to have better clearance at gas stations and various road conditions. The dealer puts in 80psi, but from time to time I get popped rivets, (if ride is the cause).

My question is this: With an approximately 8200lb trailer, 1300lb hitch weight, and just me and some luggage, (300lbs of luggage), what would you recommend on tire pressure on both vehicles for mostly interstate driving, despite the door stickers, (if recommended)?
I run my 2500 ram 70 equal axle weights of 4700 ..31’ Classic..16” michelins. 7800#s...at 70 Allison well
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Old 05-17-2021, 04:47 PM   #13
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Quote:
Originally Posted by Waterbeach View Post
As I walked around our new trailer, I noticed the Airstream sticker gave 80 psi max for the tires. I looked at the brand new Michelins and noticed the max cold pressure on the tire was 50 psi. Asked the dealer - the reply was to follow what is on the tire, not what is on the sticker - in this case run them at 44-45 psi.
Those are not OEM tires nor are they ST tires, correct? The 80psi is for Goodyear Endurance tires which are the OEM tires and are ST tires. Do not exceed the max on the sidewall, but I am confused as to why those tires are on your trailer. Others use Michelin light truck tires with success, but those are for 16 inch wheels. I am no expert, but I am not sure those are a good idea.
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Old 05-18-2021, 09:04 AM   #14
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All I can say is the dealer, Can Am RV, specifically and I understand routinely replace the OEM Goodyears with the Michelins on new trailers. This is a trailer, not a tow vehicle.
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Old 05-18-2021, 09:19 AM   #15
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Quote:
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All I can say is the dealer, Can Am RV, specifically and I understand routinely replace the OEM Goodyears with the Michelins on new trailers. This is a trailer, not a tow vehicle.
Very interesting. Can Am is very experienced, but they do things a bit differently. I would ask them on tire pressure.

I can't help but wonder why they replace the OEM tires. Goodyear Endurance seem to have developed a good reputation.
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Old 05-18-2021, 10:12 AM   #16
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Quote:
Originally Posted by Waterbeach View Post
As I walked around our new trailer, I noticed the Airstream sticker gave 80 psi max for the tires. I looked at the brand new Michelins and noticed the max cold pressure on the tire was 50 psi. Asked the dealer - the reply was to follow what is on the tire, not what is on the sticker - in this case run them at 44-45 psi.
Quote:
Originally Posted by Waterbeach View Post
Michelin Defender LTX 235/75/R15
Quote:
Originally Posted by Waterbeach View Post
All I can say is the dealer, Can Am RV, specifically and I understand routinely replace the OEM Goodyears with the Michelins on new trailers. This is a trailer, not a tow vehicle.
This all seems rather strange to me. According to Airstream literature, your trailer originally came with Goodyear ST225/75R 15 tires (at least in the US). Are you saying your dealer replaced ST "Special Trailer" tires with "Passenger" vehicle tires? My 2021 Classic came with LT225/75 R16 tires. The "LT" designation refers to "light truck".

Multi-axle trailers use ST tires which have enhanced sidewall construction to survive the scrubbing that happens when one axle gets "dragged" around corners. LT tires are built for heavier loads, and thus, seem to be a good candidate for RV trailers which can subject tires to heavy lateral stresses. In my experience, the ST tires on my FC and the LT tires on my Classic have max cold pressure of 80psi.

Waterbeach, to my untrained eye, your tires are neither designated ST nor LT. Combined with the low (50psi) maximum pressure, this seems to be a passenger tire instead. I realize the FC23 is a lot lighter than my Classic, but I would expect replacement tires to be just as competent as OEM tires. Are you sure your tires are robust enough for your application? How can you be sure?
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Old 05-18-2021, 10:59 AM   #17
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Quote:
Originally Posted by Waterbeach View Post
All I can say is the dealer, Can Am RV, specifically and I understand routinely replace the OEM Goodyears with the Michelins on new trailers. This is a trailer, not a tow vehicle.
I'm quite confused on why Can Am is replacing the tires on a 2021 trailer. The trailer was originally configured with the newer Goodyear Endurance ST tires. Based on the feedback so far, those tires are no way to be confused with the trouble ridden Marathons. So if this is a used trailer, maybe the original owner wanted no part of Goodyears, no matter the model. The fact that this trailer is badged with the 80 PSI tag, my gut is that it was refitted after the fact.

The Michelin Defender tire has been used by CanAm and truly has a 50 psi top end for inflation. This tire was debated heavily back in 2015 on the forum and is advertised as a van, light truck tire. It's also noted in some advertising as Michelin's best passenger tire.

Part of the discussion was if it was truly considered a P rated tire and subject to the need to derate its load capacity. It seemed like if you took into account the derating, and the gross weight capacity of the 23' Flying Cloud which is 6,000 lbs, the Michelin 15" LTX Defender tire should be able to navigate the load.

So my opinion is that 50 psi is a perfectly safe tire pressure. Derating the tire downwards brings the capacity of the tire to 2064 lbs at 50 psi. Total load capacity of the 4 tires is 8256 kbs which is well within the ability to safely support a 6,000 gross weight trailer.

Jack
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Old 05-18-2021, 11:23 AM   #18
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Multi-axle trailers use ST tires which have enhanced sidewall construction to survive the scrubbing that happens when one axle gets "dragged" around corners. LT tires are built for heavier loads, and thus, seem to be a good candidate for RV trailers which can subject tires to heavy lateral stresses. In my experience, the ST tires on my FC and the LT tires on my Classic have max cold pressure of 80psi.
So in this paragraph are you saying that BOTH LT's and ST's are good for travel trailers?
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Old 05-18-2021, 11:42 AM   #19
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So in this paragraph are you saying that BOTH LT's and ST's are good for travel trailers?
I'm only saying that my new 2019 FC30 Bunk came with ST tires (ST225/75R15) and my new 2021 Classic 33 came with LT tires (LT225/75R16). Presumably someone in Airstream's engineering department has signed off on these tires being "good for travel trailers".

That being said, ST stands for Special Trailer. These are trailer-specific tires. By definition, these should be good for travel trailers. Since I'm not a tire expert, I have to trust that the Michelin LT225/75R16 is good for my Classic.
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Old 05-18-2021, 11:59 AM   #20
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I was told the Classic gets the upgraded tires and no other model is Standard. That was last Summer so that could have changed.
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