Goodyear 670 tire wear

[Eaglesview]

On my 05 Dynasty we have an unusual tire wear pattern, particularly on the front tires, but also some indication on the rear tires.

The outer and inner edge of tire has an accelerated wear pattern about 3/4 inch in width and about 1/8 inch deeper than the rest of the tire.

Tire pressures to spec. Driving speed 60 to 65 mph. Alignment checked. Currently 45,000 miles but wear pattern started to surface at about 15,000 miles.

I have looked at other RV's at my storage facility and the problem is not limited to my coach. Goodyear claims no knowledge of the problem.

Anyone ideas?

[Eaglesview]

On my 05 Dynasty we have an unusual tire wear pattern, particularly on the front tires, but also some indication on the rear tires.

The outer and inner edge of tire has an accelerated wear pattern about 3/4 inch in width and about 1/8 inch deeper than the rest of the tire.

Tire pressures to spec. Driving speed 60 to 65 mph. Alignment checked. Currently 45,000 miles but wear pattern started to surface at about 15,000 miles.

I have looked at other RV's at my storage facility and the problem is not limited to my coach. Goodyear claims no knowledge of the problem.

Anyone ideas?

[Les Stallings]

If the accelerated wear is uniform on the outer and inner edges only, I truly believe low tire pressure can not be eliminated as the problem.

Is your coach somewhat heavily loaded? Have you measured tire pressures cold and with several different reliable pressure gauges??

There may be some kind of tire defect causing your problem, but it sure sounds like a tire pressure problem to me. You may want to talk to a fleet truck tire specialist for a professional opinion. You may also want to weigh your rig, all four corners if possible, to be sure of your on the road weight.

Good luck and please let us know what you find.

[Eaglesview]

I agree it sounds like a tire pressure problem, but.

Have weighed the coach and run the tires according to the inflation chart. Check pressures regularly and run with the PressurePro sensors.

And again I mention I have seen that tire wear pattern on a number of other coaches with the 670's.

[Les Stallings]

You have definitely covered your bases. This is the kind of problem that is very frustrating.

[islandtees]

What are you running for tire pressure in the front.

[Rex]

Don't remember exactly where I read it, but word is that Goodyear indicated you should carry 10 psi MORE in your tires than the load chart shows for G670 tires. I have been doing that and do NOT have the problem. I have about 4,000 miles on my tires and run 95 psi in all of them. Yes, I have weighed the coach.

Rex 01 Diplomat

[Robin_M]

Eaglesview,

Rex is correct - you need to inflate the Goodyear 670 RV tire to at least 10 psi more than the weight chart shows. Here is why...

Most truck tires today have a decoupling groove, especially on tires intended for the steering axle. The decoupling groove is a thin groove that seperates the tread from the shoulder of the tire. (See tire on left with decoupling groove, as opposed to tire on right with no decoupling groove.) Its purpose is to help prevent excessive wear or "cupping" along the outside edges of the tread by absorbing side pressures caused by steering and uneven road surfaces.

While this is a good idea, for certain applications, the decoupling groove can be a disadvantage as well as an advantage. For example, if you travel on slow winding roads or on uneven surfaces (as motorhomes tend to do) the shoulder of the tire to the exterior of the decoupling coupling groove can be prematurely worn away due to "scrubbing" of the tread shoulder. For this reason, Goodyear has chosen NOT to cut a decoupling groove in their G670 RV tire. Inflating the tires with an additional 10 pounds of air will help to releave side stresses, and therefore make up for the lack of the decoupling groove.

I run my tires with 105 lbs in the front and 100 in the rear, which gives me just a little more than my 10 psi cushion. I find that they tend to wear best at these pressures. Your pressures, however, may very according to your vehicle weight.

The pictures in this message are from a message posted by Tom Deitrich in this thread which gives you additional information on this subject.

[Hemi]

I am trying to make a decision on whether to buy new Michelin XZE LRG or new Goodyear 670 to replace the 6 tires on our 2002 Holiday Rambler Vacationer....tire size is 235/80R22.5

One problem is that the Goodyear 670 does not come in the size 235/80R22.5 (possibly other Goodyear sizes will fit on our unit).

Any comments on MIchelin vs Goodyear? thanks,

HEMI

[Robin_M]

Hemi,

Why not take this opportunity to up-size your tires? You would gain more weight carrying capacity, and you will find that the coach will ride smoother as well. I had Michelin XRV 235/80R22.5 on my last coach, a 1999 Discovery. I replaced them with Bridgestone R250F's and went up to 255/70R22.5, which was roughly the same diameter, but wider. I loved the Bridgestone tires.

That's a common size tire, and I'd guess that a call to Monaco should confirm that your coach will take that size.

As for Michelin vs. Goodyear (or Firestone or Bridgestone), I think they all make good tires today. You will find some owners swear by one or the other, but I think it's the classic "Ford vs. Chevy" argument. What you want is a brand-name all-position tire. You don't need to pay a lot of extra money for "RV tires". Any good all-position truck tire will do fine. My preference would be to look for one that is commonly available at most truck or tire centers, so that if you need to replace one on the road, you won't have to wait for days.

[Hemi]

Robin, excellent advice! And I have heard good things about Bridgestone also. Many thanks, Hemi

[Les Stallings]

You can find a lot of information here:

http://www.bridgestonetrucktires.com...g/rv/index.asp

Look around the website on the other pages too. I learned a lot.

[Sixpack98]

How well do all position hold up to infrequent use and sidewall cracking which is what "wears out" RV tires? I understand Goodyear has UV inhibitors (maybe Michelin too) which supposibly reduces cracking and lengthens the life of the tires. It would not be a lot of fun waiting days for an RV tire to show up and a commonly available tire certainly would get you on the road much cheaper. If the all position tire is considerably cheaper than the RV tire could be cheap insurance though.

[Robin_M]

Mark,

There are folks who would disagree, but my personal opinion is that UV damage to motorhome tires is an over-rated concern. First, all top brand tires have evolved to be more resilient against the effects of the sun over the years. Secondly, there are other factors at play that effect motorhome tire sidewalls. The rubber in tires have natural oils that dry out over time, whether or not we take "extra precautions" to protect them from UV damage. Also, motorhome tires tend to sit a great deal of time and are not as subject to the natural sidewall flexing that most tires get in daily operation, which helps to keep sidewalls in good shape. The combined effect is that our sidewalls become brittle over the years. Eventually they break down to the point where they become more suseptable to blowouts and should be replaced. This occurs after about 5-7 years, whether or not the sidewall shows any outward signs of cracking or UV damage. That's why it's recommended to replace motorhome tires after that much time, regardless of how much the tread is worn.

You often hear about motorhome owners who carry spare tires that are tucked away in places where UV rays are not a factor. They'll have a blowout and have the spare mounted. More often than not, they'll have a second blowout on the spare after a short period of time. The reason for that is the combined effects of sidewall drying, along with the severe lack of nautral flexing that a healthy sidewall gets in daily use.