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Old 06-26-2020, 07:27 AM   #1
RK & Jen
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Tire Wear

I have a 2018 3790RD that has the left front tire wearing on the inside and outside which I believe is an alignment issue. I have contacted many of the large trailer maintenance companies in the St. Louis area but get the sorry can't help you. Any recommendation on who I could contact in the Elkhart, IN area that specializes in alignments. Thanks.

Ron
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Old 06-26-2020, 09:56 AM   #2
Carl n Susan
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That looks like normal wear due to turning tight corners. The edge of the G614 or Sailuns have extra rubber there and you will see this on most rigs.
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Old 06-26-2020, 10:56 AM   #3
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I am having to get my wheels aligned so I just googled “trailer alignment” and got several places in my area that do them.
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Old 06-26-2020, 11:26 AM   #4
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Weight the trailer axles, then consult Sailun’s load/inflation chart. Looks like a classic case of over inflation to me. A heavy duty tire like the Sailun will wear off the outside edges of the tread when over inflated because the edges of the tread “scrub” as the tire rotates because there is less pressure at the edges than at the center of the tread. Passenger car tires are much softer, so they do the opposite.
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Old 06-26-2020, 11:46 AM   #5
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Tire Wear

Thanks, definitely Sailun's. I check the tire pressure before each trip and ensure it's 110 psi. The RV lot I use on Scott AFB is just an asphalt parking lot with diagonal lines which makes for tight turns parking between other RV's. I see the tire/wheel flex in my mirror when backing.
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Old 06-26-2020, 11:55 AM   #6
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That looks like normal wear due to turning tight corners. The edge of the G614 or Sailuns have extra rubber there and you will see this on most rigs.
Not exactly. My tires were way worse wearing on the inside on one side of the rig outside on the other. It was due to improper alignment. I guess not everyone has alignment issues but lucky me that’s what happens when the employee doesn’t give a crap I guess. Keystone has ignored me and trailer life magazine for resolution.

As far as alignment I took a straight piece of wood or steel place along the tires it should make contact at all 4 points of the tire if it doesn’t the alignment is most likely out. On top of that issue I had 3 of the 4 wheel bearings were improperly installed and I needed new bearings.

Tony
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Old 06-26-2020, 11:57 AM   #7
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My point was that 110 might be too much pressure for the load that the tires are carrying. The load/inflation table will tell you the proper pressure for different loads. Be aware that once a tire starts wearing unevenly, it will continue to do so, even if the cause is corrected. It will get worse if not corrected, or will “stall” & stay pretty much the same if corrected.
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Old 06-26-2020, 12:02 PM   #8
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110 psi is exactly where these tires should be, so I have also been told on this forum anything less would create additional unwanted heat..again learned that from this forum. I run mine at 110 period, not an issue since alignment new bearings correction and I’m on the road now as we speak.
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Old 06-26-2020, 12:13 PM   #9
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Everyone has an opinion, some are right, some are wrong. Sailun provides a load/inflation chart for a reason. Tire pressures on these heavy duty tires should be adjusted according to average load to provide optimum tire wear. The old junk load range E & lower tires should be run at maximum pressure because they were run right at their limits as it was. These load range G tires have plenty of excess capacity.
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Old 06-26-2020, 12:19 PM   #10
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Opinions everywhere....
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Old 06-26-2020, 04:27 PM   #11
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Wearing inside and outside is likely not an alignment issue. Pressure issue possibly but doubtful according to the photo. Your trailer is heavy so max pressure is advised. This looks to be from sharp turning. If only the one tire I suspect your sharp turns are often the same directions. Rotate the tires on occasion and keep an eye on them. Mine wore the same way and no problems for five years.
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Old 06-26-2020, 09:28 PM   #12
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just my opinion but if a tire wears on the inside on the right (or left) and the other tire on the axle wears on the outside, it just makes sense that the axle is not perpendicular to direction of travel. You are pushing one tire down the road and dragging the other.
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Old 06-26-2020, 09:32 PM   #13
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Wearing inside and outside is likely not an alignment issue.
It was in my case
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Old 06-26-2020, 11:28 PM   #14
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Tony-- If you can get a "four point weighing" which weighs each wheel separately on your unit for weight that each individual tire is carrying, I would suggest getting this done and you can then go to the chart from Sailun and decide what pressure each tires should be. They do suggest 110 psi but if you are running lighter than the norm you might be able to run with less air. If over on a specific tire, you might have to rearrange things in the storage area to compensate for this difference. Don't let anyone tell you that your tires are aligned because they are not unless you go to the IS system and then they must be checked yearly by MorRyde or an authorized company certified by them. I have had my unit aligned once since I bought it and have put on two sets of tires since purchase in 2014. I had it aligned at a tractor/trailer company that align and replace axles on the big rigs going down the roads carrying all the heavy equipment and supplies for the US. An axle can get out of alignment just by bumping a curb or even by making some tight turns. As Carl stated the G rated tires wear on the outsides and they do look normal wear to me also. Good luck and be safe out there.
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Old 06-27-2020, 05:26 AM   #15
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It was in my case
You wear pattern was like the OP's on just one tire?
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Old 06-27-2020, 07:03 AM   #16
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You wear pattern was like the OP's on just one tire?
All 4. Required alignment new bearings and new tires. About 3500-4000 miles on them now and no signs of premature wear.
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Old 06-27-2020, 07:16 AM   #17
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Rondo, I know they weren’t aligned I tested them myself. Called morryde and they even confirmed that I needed to get them looked at. Took the rig to east county alignment one of their authorized repair facilities. If I remember correctly the rear axle was 3/4 of an inch out and the front was 1/2. Took him a few hours to do it but had to redo the bearings because they weren’t don’t done correctly lots of play in the wheels and for the warranty to be valid they needed to replace the bearings. I have pictures of everything. In my case there was no bumping a curb or hitting anything just driving... the way it was explained to me was since the rear axle was worse then the front he said I would have had to be going 80 in reverse and hit a curb for it to be that far out. East county alignment and camping word San Marco both came up with the same conclusion bad factory install. Given 2 independent businesses I’m still being ghosted by keystone for reimbursement.
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Old 06-27-2020, 09:13 AM   #18
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Under inflation.
The circumference of the outside edge is less than the circumference of the center of the tread. At too low a pressure the outside edges must scuff to keep up with the inside. Think of dually tires when one tire is low pressure or flat it builds up heat scuffing along and sometimes will catch fire.

Also;
https://recstuff.com/pro-tips/identi...nd-its-causes/
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Old 07-01-2020, 02:13 PM   #19
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From experience, take it to a an alignment shop that does computerized alignment. This way you know for sure if the alignment is right. I to mine to a shop that does alignment on buses, trucks, motor homes, etc. you will not be sorry.
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Old 07-01-2020, 02:55 PM   #20
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Tire Wear

We have the exact same tire wear issue. The OEM Sailuns were garbage. They were wearing off like an eraser removing pencil on paper. Barely got 5,000 miles out of them. I replaced them with Carlisles and have concluded that with higher rated tires like these Carlisles and running at 105 lb I get the best wear but still have excessive wear after 12,000 miles on the front tire on the driver side which is where all our weight is. This side has the kitchen with the longest slide out as well as the bedroom slide out. I’ve spoken with countless people about this including this forum and have concluded that this is a design/engineering issue. I could get slightly longer wear by rotating the tires regularly but have resigned myself to this being the nature of the Montana beast. Change tires every 12,000 to 15,000 miles. Alignment seems like a red-herring and the dealer says the axles are within “manufacturers spec”. Good luck with yours.
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