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Old 05-07-2013, 06:10 PM   #29
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As a retired school bus technician and supervisor of 33 years,I can assure that there are instances where tires can sway for several hundred miles.Then drive just fine. BUT ,I am only aware of this occurring on RECAPPED tires.Bandage was the brand.
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Old 05-07-2013, 06:18 PM   #30
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The OP is talking about rear end sway and I don't believe that is tread flexing. I believe you are talking about tread flexing
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Old 05-08-2013, 11:58 AM   #31
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Call it what You may. The feeling I have experienced is a sway,tail wagging the dog,etc.
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Old 05-08-2013, 07:46 PM   #32
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I have been driving trucks for 19 years and have owned my own for the last twelve. Millions of miles on the road! And many many thousands in the bush and up north on the ice. I remember the first time as a young man my boss sent me bob tailing to the tire shop to get new tires put on the truck, after just a few miles after having left I pulled into a truck stop and told him something was wrong with the new tires! He just laughed and asked "why, does it feel like your driving on mud?" And that's exactly what it felt like and still does every time I get new rubber on my truck. The more aggressive the tire the worse it feels and the longer it takes to go away.
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Old 05-08-2013, 09:33 PM   #33
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Hi I don't have a big rig but I inflate my tires what Winnebago stated on my door sticker. The fronts have more than the rears as my is a gas job. I think by what I have been reading you have to much air in the rears. What does Neumar recommend? I would check with them and adjust accordingly.

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Old 05-08-2013, 09:49 PM   #34
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SOS Michelin Tires

Seating in. Imagine your tires as a brand new eraser on a pencil. As you use the eraser the rubber wiggles or squirms and with continuous use the rubber wiggles less. Another thing to look at is the footprint width of the Goodyear compared to Michelin. Case in point you will get a lot more squirming on a chinese tire than you would on a grade A tire because the foorprint is a lot less and even a small 1/4 of an inch in width has a huge impact on driving your RV safely. Good luck!
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Old 05-08-2013, 10:09 PM   #35
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Originally Posted by Two Sides View Post
SOS Michelin 275 70R 22.5 XZA2 Original tires on 2002 Dutchstar 40' DP were Michelin 275 70R 22.5. In 2007 replaced the with Goodyear G670 for 6 years. 35,000 miles, really liked them. No sway! Handled very good. Towing a Silverado w/ M&G brake system. I ran 112 in the front tires and 110 in the rear. Our weight did not change when we had the XZA2's installed. As a starting point I had the Michelin dealer put 115 in all tires. It handles like a car w/ 15 lbs of air in tires that should have 32lbs Very sever sway front and rear.
Our weights are as follows. Fronts L 5500 / R 5675 Rear L 9175 R 9405
Have driven the MH 1,000 miles from GA. to SD. and still feels unsafe.
Called the Michelin dealer and got the run around. Called Michelin and spoke w/ 2 different service people. We have a Case # and have had a case # since we had 500 miles on the tires. One Michelin customer service agent said put 120lbs in the tires. Another Michelin rep said put 130 lbs in all the tires. Went to a local Michelin dealer in Rapid City, SD. He contacted Michelin and they were no help. They said to put on XZE2 275 70R22.5. Are there any comments!!!!!!
Need some INPUT from you folks out there. HELP!!!!
What is the XZE2 Tire compared to the XZA2.
With our 2002 DSDP we had to run 120 psi in the tires even though the tire required 125 for the load the wheels were only certified for 120 psi. Michelin gave us a letter allowing the lower tire pressure even with them needing more pressure according to the charts. Didn't have any problems with sway. Now that I've replaced all the tires 305/70's in the front and 275/70's in the rear I notice a little more trouble steering but I've only got a couple 1,000 miles on them so far.
And yes, we do have the axle capacity to use the 305/70's higher capacity due to the axle change (12,000# to 14,600#) paid for by Newmar and done at Spartan in 2004. I'm running the fronts at 105 and the rears at 90 psi. I have also had a chassis alignment done with the new tires.
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Old 05-08-2013, 10:50 PM   #36
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Steering- multiply your max load rating on tire by 2, divide by max cold pressure rating. You will have a weight value per pound of air that the tire is designed to handle. Now divide your actual axle weight by that value, the answer will be the pressure you should be running in your tires.
Eg; Goodyear 245/70 19.5
Max weight single wheel 4080lbs at 95
Psi
4080 multiply by 2= 8160
8160 divided by 95= 85.89
Actual steering weight fully loaded
6900lbs
6900 divided by 85.89= 80.33

So in this example 80.33 lbs of air is what these tires require to carry this load. This works well for any vehicle, I have been doing this with my semi's and pick ups and my rv for many many years. You will get the most even tire wear best possible traction and best ride your tires can give. On a dually or four tires per axle multiply by four and divide by max cold tire pressure.
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Old 05-08-2013, 11:10 PM   #37
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SOS Michelin 275 70R 22.5 HELP

SOS Michelin 275 70R22.5 XZA2
The original tires on 2002 Dutchstar 40' DP were Michelin 275 70R22.5. In 2007 I replaced them with Goodyear G670. Had them on for 6 years and 35,000 miles. Really liked them. No sway!! Handled very good. Towing a Silverado w/ M&G brake system. I ran 112 in the front tires and 110 in the rear. Our weight did not change when we just now put on XZA2 Michelin. As a starting point I had the Michelin dealer put 115 in all tires. It handles like a car w/ 15 lbs of air in tires that should have 32 lbs. In other wards it has very severe sway front and rear. Our weights are as follows. Fronts L 5500 / R 5675 REARS= L 9175 R 9405.
Have driven the Mh 1,000 miles from GA to SD. and still feels unsafe.
Called the Michelin dealer where we bought the tires at 500 miles and told them of our swaying, got the run around. I had him call his Michelin REP. It took me calling him 4 times to get and answer from him. The last time I called him the rep told him to have us put in 130 LBS. Still handles like a whale in a BIG bowl of jello. The dealer in SD contacted Mich and we still are getting the run around. What is the XZA2 compared to the XZE2. HELP!!!!HELP!!!
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Old 05-09-2013, 07:14 AM   #38
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Quote:
Originally Posted by Two Sides View Post
SOS Michelin 275 70R 22.5 XZA2 Original tires on 2002 Dutchstar 40' DP were Michelin 275 70R 22.5. In 2007 replaced the with Goodyear G670 for 6 years. 35,000 miles, really liked them. No sway! Handled very good. Towing a Silverado w/ M&G brake system. I ran 112 in the front tires and 110 in the rear. Our weight did not change when we had the XZA2's installed. As a starting point I had the Michelin dealer put 115 in all tires. It handles like a car w/ 15 lbs of air in tires that should have 32lbs Very sever sway front and rear.
Our weights are as follows. Fronts L 5500 / R 5675 Rear L 9175 R 9405
Have driven the MH 1,000 miles from GA. to SD. and still feels unsafe.
Called the Michelin dealer and got the run around. Called Michelin and spoke w/ 2 different service people. We have a Case # and have had a case # since we had 500 miles on the tires. One Michelin customer service agent said put 120lbs in the tires. Another Michelin rep said put 130 lbs in all the tires. Went to a local Michelin dealer in Rapid City, SD. He contacted Michelin and they were no help. They said to put on XZE2 275 70R22.5. Are there any comments!!!!!!
Need some INPUT from you folks out there. HELP!!!!
What is the XZE2 Tire compared to the XZA2.
Based on your weights, I believe you are way, way over inflated. Try decreasing your pressure to the following:
Steer axle tires 105 psi
Drive axle tires 85-90 psi

To verify, look in this Michelin inflation chart on page 20:

http://www.michelinrvtires.com/asset...esBrochure.pdf

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Old 05-09-2013, 10:36 AM   #39
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Michelin tires

The Michelin XRV is the one made for RV use. The others work well also. I think you should check the tire pressure listed on the specs decal located somewhere in your MH. Not sure where it is in your coach, but is on the wall to the left of my drivers seat in mine. That tells you what the manufacturer suggests aas the best pressure to use. Also need to weight all four corners to see what actual weight on each tire is and adjust pressure accordingly.

I have a 24,000 lb chassis running Michelin XRV 235/80R 22.5 at 95 front 90 rear. Tracks beautifully.

Good luck, and............

Happy Trails!

Darryl
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Old 05-09-2013, 10:59 AM   #40
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Did you check to see if they snapped a shock on you when they jacked it up to change the tires?
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Old 05-09-2013, 11:54 AM   #41
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I can;t help you with the sway problem, as I am still running G670's and they have been great. I took Michelin's off because I didnt like them; not because they were old (they were a little over 2 years old). BUT, watch out puting 130 lbs of air in those tires. I think your wheels are stamped for 125psi max. You should not need those kind of pressures anyways. 110 should be good for those weights. Maybe you will need to put a different set of steer tires on that rig.
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Old 05-14-2013, 12:03 PM   #42
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Quote:
Originally Posted by Charrua72 View Post
Steering- multiply your max load rating on tire by 2, divide by max cold pressure rating. You will have a weight value per pound of air that the tire is designed to handle. Now divide your actual axle weight by that value, the answer will be the pressure you should be running in your tires.
Eg; Goodyear 245/70 19.5
Max weight single wheel 4080lbs at 95
Psi
4080 multiply by 2= 8160
8160 divided by 95= 85.89
Actual steering weight fully loaded
6900lbs
6900 divided by 85.89= 80.33

So in this example 80.33 lbs of air is what these tires require to carry this load. This works well for any vehicle, I have been doing this with my semi's and pick ups and my rv for many many years. You will get the most even tire wear best possible traction and best ride your tires can give. On a dually or four tires per axle multiply by four and divide by max cold tire pressure.
This is fantastic. The calculations come very very close to published values from Michelin and Goodyear charts. I've already put it into a spreadsheet and put it in my phone...
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