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Old 05-02-2013, 09:05 AM   #1
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SOS!!!!! New Michelin tires

Bought new Michelin XZA2 275/70R22.5LRJ running (111lbs presssre) tires 500 miles ago . 40' DP. Had Goodyear before replacing and ran (112lbs pressure. ) I have had the rig weighed so I know what my weighs are. My PROBLEM is when I'm going down the road 62mph the rearend sways so bad that I am scared to death ! The dealer said that it would take a few miles to seat in but this is RIDICULUS !!!!!! Can anyone help with suggestions ???? My wife refuses to ride anymore.... Here's my weights Front: 5675 Rear: 18,660
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Old 05-02-2013, 09:42 AM   #2
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I've never heard of tires being seated in perhaps some one else has. Possible lugs not tight? just a guess. I've always had a better ride with newer tires when installed. Hopefully someone can help. Good luck.
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Old 05-02-2013, 09:49 AM   #3
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It is very possible that you have a "bad" tire that was manufactured that way. Not a very likely thing, but it does happen. It should have been picked up when the tires were balanced. They were balanced, right?

I'd ask for an inspection and watch them balance the tires.
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Old 05-02-2013, 10:21 AM   #4
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Quote:
Originally Posted by Two Sides View Post
Bought new Michelin XZA2 275/70R22.5LRJ running (111lbs presssre) tires 500 miles ago . 40' DP. Had Goodyear before replacing and ran (112lbs pressure. ) I have had the rig weighed so I know what my weighs are. My PROBLEM is when I'm going down the road 62mph the rearend sways so bad that I am scared to death ! The dealer said that it would take a few miles to seat in but this is RIDICULUS !!!!!! Can anyone help with suggestions ???? My wife refuses to ride anymore.... Here's my weights Front: 5675 Rear: 18,660
One issue you have is you are running your pressure too high at all wheel positions. The steer axle is not too far off. 105 pounds will carry your weight so 111 is certainly in an acceptable range. The drive axle tires can carry over 20k at 90 psi. Drop your pressure back there to 95-100 psi & see if your handling improves. Have you changed the way your coach is loaded or do you have anything heavy hanging on the back? Your weight distribution appears to be pretty heavy on the back.
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Old 05-02-2013, 12:09 PM   #5
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This is old news, but you need to get your coach weighed at all 4 corners and then adjust your tires per the Michelin recommended tire chart. Using inflations from the past and a different manufacturer's recommendations is not something I would do. Although you may have a rim seating or alignment issue at back, it appears that your tires are overinflated, especially the rears, and that can seriously effect the handling characteristics of a radial tire. Too much air pressure pulls the tire edges further up from the road and actually dimiishes the amount of rubber or traction available....hence sway and handling problems. I suspect you are at least 5-10 lbs or so high on the rear, and that could easily be the problem. Too high on the front won't help either. A few pounds on a radial tire can make a very noticeable diiference in most cases. It did on mine....

Please let us know how you make out....thanks!
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Old 05-02-2013, 12:15 PM   #6
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Once your tires get some mileage on them 1-2k the sway feeling will stop
All big tires do the same thing.

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Old 05-02-2013, 12:21 PM   #7
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Hi Two Sides,
First consider what Steve Ownby posted. I have the same side tires as you. I am 19K+ on the drive axle and run 90 PSI per Michelin inflation table. The front is about 11.5K and I run 100 PSI.

If you try this and it does not work, the bad tire idea posted by Wayne M should be checked.

I have my tires balanced when installed + Centramatics are installed on all wheels.
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Old 05-02-2013, 12:32 PM   #8
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Is'nt 5670lbs awfull light for for the front of a 40' DP
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Old 05-02-2013, 02:07 PM   #9
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Hi 96 Wideglide,
My assumption is the front weight quoted was for one side. That would make the OP's front axle around 11-12K. That weight is about right.
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Old 05-02-2013, 05:22 PM   #10
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He may have quoted one side only for the front, but the rear weight appears to be the axle total. Why state the front and rear differently? It would be helpful if Two Sides could verify what those weights really are.

I've heard of people experiencing a "run in" time for new tires, but not often. It's never happened with any of mine.
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Old 05-02-2013, 06:43 PM   #11
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Quote:
Originally Posted by Jack R View Post
Once your tires get some mileage on them 1-2k the sway feeling will stop
All big tires do the same thing.

jack r
that is correct
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Old 05-02-2013, 08:53 PM   #12
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Come on guys there is no such think as breaking in a tire with a few miles to stop it swaying. Where did that tale come from? I hAve those tires on my Sig and they were great from the start. That is like saying the sidewalls on a Michelin tire are too thin so it rolls. Where do all these "tire engineers" come from that know better than the tire manufacture.
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Old 05-02-2013, 08:59 PM   #13
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Quote:
Originally Posted by Two Sides View Post
Bought new Michelin XZA2 275/70R22.5LRJ running (111lbs presssre) tires 500 miles ago . 40' DP. Had Goodyear before replacing and ran (112lbs pressure. ) I have had the rig weighed so I know what my weights are. My PROBLEM is when I'm going down the road 62mph the rearend sways so bad that I am scared to death ! The dealer said that it would take a few miles to seat in but this is RIDICULUS !!!!!! Can anyone help with suggestions ???? My wife refuses to ride anymore.... Here's my weights Front: 5675 Rear: 18,660
I have those same tires on the rear of our DSDP and about the same weight. One and a half years old, maybe 5,000 miles on them. According to the Michelin weight/pressure charts I can run 85 psi but I run 90. I don't have a sway problem. Maybe you have too much pressure?

I have 305/70's on the front and run them at 105 psi.

According to Cummins tires take 35-40,000 miles before they give the best fuel mileage, but I've never seen anything about tires needing to break in so they ride/steer right.
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Old 05-02-2013, 09:09 PM   #14
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Quote:
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Once your tires get some mileage on them 1-2k the sway feeling will stop
All big tires do the same thing.

jack r
My new Toyo's never caused any sway when new, in fact the ride was better than the old Michelin's from day one.
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