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Old 12-24-2015, 05:42 PM   #1
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Shake in front end

I purchased a used Holiday Rambler Arista 300 in July and have been getting the hang of RVing. I have noticed a vibration or shake in the front end (mainly the steering wheel) when getting up to 60 mph and above. The faster you get above 60 the worse the shake in the steering wheel becomes. I took it to the Ford dealer to have the front end checked out and tires balanced. THe service manager said that the front tires appear to have a flat spot in them and he suspected the motorhome had sat for a long duration. He thought I might have to replace the tires to eliminate the problem.
The front tires are supposedly "new" when I bought the RV. I cannot decipher the DOT code on the tires like I could on the rear ones (OE tires, 8 years old). Having replace the rear tires a few months back I am not opposed to replacing the front to have them all match.
Any opinions?

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Old 12-24-2015, 05:47 PM   #2
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Well, if the tires are the same size, front and rear, I would move a set of the rear to the front to confirm "flat" spot, I believe the dealer just said this, because he does not know what is wrong, I have never heard of a flat spot that would not go back to normal after a few miles of driving.

If the tires are old I could see maybe the belts inside the tire separating causing the vibration.

The dealer could of easily swap the front to the rear if they did indeed rebalance them.

Did you look at the tires? did you see new tire weights on them?

Sorry if this post sounds so negative against "The Dealer"

Take a pic of the date code and lets have a look, also you might have to look on the other side of the tire for the code, it is usually only on one side of the tire.

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Old 12-24-2015, 06:06 PM   #3
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A flat spot wouldn't just show up at 60 + MPH. You should feel it all of the time. I did when my tire belts came apart.

Sounds like balance.

Take it to a truck tire shop. They will read the DOT code and be able to balance your tires.

You could get some balance beads or centrmatic balance things that go on behind the tires.

I don't think much of the auto balance things because, as they did to me, they hide the damage to the belts by rebalancing them as they got worse.

By the time I felt the shake, the tires were in dangerously bad shape.
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Old 12-24-2015, 06:23 PM   #4
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flat spot on tires...

Yes, I agree that the "flat spot" seemed a little odd and should be felt at all mild a faster speeds, not just above 60. If there truly is a flat spot, I would suspect some internal damage to the tire structure.
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Old 12-24-2015, 07:11 PM   #5
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I think you have a tire that has Ply separation. This would show up at certain speed or road curving. This problem could show up even on brand new tires. Swap the two front tires to the rear and see what happens.
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Old 12-24-2015, 07:17 PM   #6
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I think balance also. How far out of balance will usually determine the speed the vibration shows up. The earlier it starts the worse it will be at speed. Swapping a pair with the rear is a pretty low cost test. Also use a heavy truck tire center. They have the equipment to balance a 70 lbs. wheel properly.
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Old 12-25-2015, 07:38 AM   #7
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Shake in front end

Recommend you also consider 'tire run out' - a new learning opportunity for me earlier this month when I experienced a steering wheel vibration/shake at 50 - 60 mph.

Basically, with the front tire still mounted on the coach and jacked clear of the floor, a simple floor-standing gauge is used to measure a tire's 'high point' while it is rotated 360 degrees. That point is marked, the tire is rebalanced and remounted with the high point at the top (12 o'clock) position. Simple enough - fixed the problem.

I'm still figuring out the physics ...
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Old 12-25-2015, 08:51 AM   #8
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High spot on tire

I have seen tires broke loose from the rim and rotated due to a high spot, which is caused by imperfect centering on the wheel, and then re-balancing. I am not sure about what you have described, however, if it worked for you I am not knocking it.
Thanks for the input.
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Old 12-25-2015, 09:22 AM   #9
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I found that when I loss 30-40 lbs, my 'front' did not seem to shake as much! (Yeah, I know, no help at all - but, it was what I first thought of when I read the thread topic!).

Good input for you to follow up on. Please close the loop back, and let us know what it was...
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Old 12-29-2015, 12:01 PM   #10
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Solution to Shake in Front End

Well dieting might the drivers, but as it turned out, a new pair of tires was needed to fix the vibration. I have had MH up to 72 with not discernable shake as previously detected. Thanks to everyone for their input.

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