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Old 10-04-2021, 11:07 AM   #21
Bruce in DFW
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Same wear pattern on my Sailun S637

I have the same wear pattern on my 2017 3811MS - both axles - proper inflation. Otherwise, they look good. I'm going to keep running mine as is. Seems fairly normal for many fifth wheels.
 
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Old 10-04-2021, 11:47 AM   #22
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It is interesting that the wear occurred in the last 3k miles. Sounds like something occurred which caused a change.
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Old 10-04-2021, 04:53 PM   #23
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Scott, ours were doing the same thing and I took it to a company that works on over the road trailers and they realigned the axles and made sure they had the correct curvature(can't remember the correct term for this) in the axles. They corrected and aligned the axles and no more problems. Good luck and it was good to see you and Alta in Goshen.
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Old 11-19-2021, 10:12 PM   #24
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I have made measurements and all seems to be in order. The one measurement I question is the axles being parallel to each other; there is about 1/4" difference. 37" on the left, 36 3/4" on the right. It would be difficult to change this since it is a function of where the spring hangers are welded to the frame.

I have no idea what the specs are, anyone find 1/4" excessive?
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Old 11-20-2021, 02:12 AM   #25
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I was told that 1/4" +/- was the tolerance on mine.
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Old 11-20-2021, 05:28 AM   #26
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My vague recollectionis is that 1/8" +/- is acceptable. I would consider 1/4" excessive and worthy of further evaluation.
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Old 11-20-2021, 10:01 AM   #27
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I looked at the pin/spring pad relationship on the right side. I might be able to loosen the ubolts and get the axles 1/8 to 1/4 inch further apart. However, that would affect the tow in on both wheels on that side. I'm a little reluctant to mess with the alignment using levels and a tape measure after the alignment shop did it with lasers. Especially since I do not know that alignment is causing the tire issue. I think I will leave it be.
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Old 11-20-2021, 10:42 AM   #28
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I watched the 2 videos earlier. One mentioned 'slow wear' tires. What exactly does this mean? Thanks
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Old 06-13-2024, 05:33 AM   #29
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under inflation?

Hi folks,
I know this is an old post but super helpful. I have almost brand new Carlisle G rated tires second set I've run from Discount Tire. I finally got smart and installed a TPMS Tire Minder system since I saw that inside and outside edge major wear on my last trip across country.

My cold inflation numbers looks like 80lbs front and 83lbs rear at my current stop which is WAY under inflated.
Based on my weight and everything I'm reading, everyone seems to be running their tires at max inflation 110psi cold, is that pretty accurate?
I'm afraid of over-inflating so I was going to bump up to 100lbs at first and monitor closely.

Thanks all!

Scott
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Old 06-13-2024, 06:01 AM   #30
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Check your rims for a stamp on the inboard side. Make sure your rims are rated for 110psi.
Go on the manufacturer website and verify the load and tire pressure range for those specific tires to be sure.
Monty did an excellent write up regarding TPMS.

https://www.montanaowners.com/forums...ad.php?t=89929
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Old 06-13-2024, 06:07 AM   #31
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thanks!
Yes i checked the rims and they are indeed rated for 110psi.
This aligns with the placard on the side of the camper as well.

My question is - what I'm seeing here is most people are running at 110psi cold and I'm a little apprehensive doing that.
No, I haven't weighed the loaded trailer and truck yet at a CAT scale but I am planning on doing that so I know precisely what would be recommended as well as checking the Carlisle charts since they're the manufacturer.

As I said, my feeling certainly is that 80-85lbs PSI is way underinflated so I feel like at least I'm going down the right road, i.e. monitoring the tire inflation via my TPMS system. I was pretty naiive for quite some time.

Thanks a ton folks

Scott
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Old 06-13-2024, 12:24 PM   #32
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110 cold. Pressure will go up as you drive and tires get hot; designed for that, that is not over inflated.
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Old 06-13-2024, 12:38 PM   #33
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thanks a ton! Sorry i missed this, i posted basically the same question on another thread. I've gotten them up to almost 100lbs but will get them to 110. I think i was just a little concerned running that much pressure with the trailer fully loaded and not knowing the exact weight would be a problem.
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Old 06-14-2024, 11:21 AM   #34
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My tire load chart decal says 110 psi…what does yours say?
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Old 06-14-2024, 11:53 AM   #35
Daryles
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We had ours set for 110psi cold (relative term) morning temperature.
We drove to Austin Texas in August. It was 104⁰F.
Tire temperature was 138⁰F sunny side.
Tire pressure was 128psi.
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Old 06-14-2024, 12:42 PM   #36
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thanks folks, I'm driving across country from Texas to Maine, so I'm in Virginia right now. I check the air pressure every morning and inflated today with my Vair compressor up to between 100-105psi. They mostly ran between 117 and 124psi the entire leg of this trip after they heated up.
I'm checking the wear every day now I'm thinking some of this was very much my own fault, running tires between 80-85psi certainly couldn't have helped at all especially with the camper fully loaded up.
But so far so good - I definitely feel pretty dumb for being so callous with my tires over these few years but at least I smartened up before a blowout or worse.

Scott
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