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Old 06-03-2023, 02:24 PM   #1
Join Date: Oct 2022
Location: Edgewater, Florida
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Getting rid of flat spots ??

My Goodyear RV 245/70 19.5 tires are 2021, 4000 miles, Rv parked for one year on grass in Florida. Then I bouht this RV.
Drove now all the way to Montana from Florida.
55mph no vibration, then intermittend vibration 60-65mph. Think if the flat spots are in sync, then vibration the most.
Have Centramatic wheel balancers.
One can see the vibrations in a glass of water.

Will this get better with + 5000 miles driving ?
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Old 06-03-2023, 03:29 PM   #2
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In ~55 years of driving - the only flat spotting of a tire I’ve ever experienced is when the brakes were slammed on hard enough to skid the tires.

I’ve had boats sitting on trailers for months at a time, no unusual vibration that I could detect.

How many miles on the coach, and what shape is the front end linkage in? There are known issues with bell cranks on Chevy P30/possibly Workhorse chassis with Independent Front Suspension (our ‘91 P30 driver side was worn out at 17,000 miles along with the pitman arm ball joints). Those items being worn out more likely to cause shimmy than vibration, but just as a word of caution/something to look at.
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Old 06-03-2023, 06:50 PM   #3
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Ok, so this is a new to you RV with tires a couple of years old tires with a vibration ( intermittent ) at 60/65 .

Intermittent, almost eliminates tire balance .
Flat spots can be felt worse at slow speeds , where any spot has a longer time to contact the road surface and pass on motion to the suspension .

Is the vibration felt through the steering wheel , or the seat and the floor ?
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Old 06-03-2023, 08:21 PM   #4
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Centramatic won't solve a problem with flat spots.
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Old 06-04-2023, 05:43 AM   #5
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If the tires are out of round, you can have them trued. I paid $50/tire about a year ago. Made a big difference. Same issue you describe.
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Old 06-04-2023, 09:06 AM   #6
Join Date: Oct 2022
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RV has only 5000 miles on it.
Also think out of round tires.
So far have not found a place that does tire trueing.
Have warranty on those Goodyear RV tires.
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Old 06-04-2023, 09:40 AM   #7
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Good luck getting warranty from GY
Are the tires G670?
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Old 06-04-2023, 10:09 AM   #8
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This guy is awesome. About an hour away from you…maybe a little more.
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Old 06-04-2023, 11:31 AM   #9
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Flat spots seem highly unlikely to me. It's almost a non-existent problem on modern tires because the tire carcass material flexes and quickly returns to round soon after driving on the highway. Nor do your symptoms sound to me like flat-spotting.

Given that you have Centramatics, I'd be considering a drive shaft alignment/balance issue. Another slim possibility is that one or more tires has tread separation from the tire body. That typically doesn't show up until higher speeds.
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Old 06-04-2023, 12:35 PM   #10
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For those interested, here’s a pic of the tire on the trueing machine and a pic of the tread that came off. The story here is that the rig was a friend’s unit with newer G670 GY 19” tires on an F53 chassis. When I first drove it, it shook pretty bad T certain speeds. I think he had an alignment issue and probably a tire pressure issue that resulted in bad tire wear.

Having the tires trued and balanced made a big difference. Five of the six tires needed to be trued. The balance wasn’t way off…just made sense to do a balance job while the wheels were off the rig.
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Old 06-05-2023, 05:46 AM   #11
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You didn't specify what make/year your chassis is, so I'll tell you my experience with my Ford F53--- 1999. They had a bunch of bad wheels in that time frame causing vibrations plus, those wheels were not self centering... a special jig was needed to mount the wheels properly. I finally found a Ford truck dealer that was aware of the situation and had the tools. When I went there, he had a huge stack of the bad wheels piled up in the back of the lot. He mounted my tires on new wheels, did road force balancing and used the jig to mount the wheels. After that it rode fine.
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Old 06-06-2023, 02:08 PM   #12
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Looking at your profile, not only are the tires from 2021, so is your coach, a 2021 Jayco Alante. It would be unusual to have such an issue with only 4K miles. Modern tires don't get flat spots and even if they did, they would run true after a few miles.

You need to identify if the vibration is in the seat or steering. Ford had some issues with their tires/rims and some had to be Road Force Trued. People tried all types of things and finally found he Road Force Truing cured the issue. Here is an article.....
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