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Old 04-16-2012, 01:59 PM   #1
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Goodyear G670 Built in UV Protection. Donít bet on it!

Recently purchased (4) Michelin Energy tires for my 2007 Monaco Knight. Went through Monaco International for excellent pricing. When they remove the Goodyear G670 passenger outside dual tire it showed a ľĒ gap where the tire was separating. The tire DOT showed 1606 so they were just over six years old. I decided to post thread to show one, not sure how much the anti-oxidant crap works and two, you just don't know the condition of your tires no matter what you think. I have included a photo of the tires in question. These photos show the tire off the rim. When the tire was inflated, you could put your little finger in the gap. I was very lucky not to have a major incident. I have wheel covers and use them as much as possible. I can only assume that our coach was a year old when we purchased it in 07.
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Old 04-16-2012, 02:33 PM   #2
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So if the cracks are hidden between the duals (must not be on the outside where you'd have seen it early) then I'm not suspecting sun damage. Cracks like that seem to make me think of underinflation and heat damage. Is it possible that's what caused this?

I also have a model year 07 MH with the same tire brand and model and have no cracks. I examine mine regularly on both sides of each dual and both sides of each single tire.

Ken
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Old 04-16-2012, 02:50 PM   #3
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If I've seen one, I've seen a hundred...

I worked in the trucking industry for "many years", and I've been hearing that GY had their "Bead Cracking" issue resolved for over 20 + years now.....
DUH
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Old 04-16-2012, 02:57 PM   #4
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Hmmm, where the sun don't shine? My Goodyear G670 are showing no signs of sidewall cracking at 4 years. Michelins on a previous coach looked much worse at 4 years.
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Old 04-16-2012, 03:25 PM   #5
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OTH our Michelins looked pretty good after 8+ years. Some checking but not to the point of absolutely needing replacement. I did, however, need a hard to find size I ordered early and changed when they came in.
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Old 04-16-2012, 04:52 PM   #6
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I am extremely diligent of checking my tire pressure the morning of every departure. I also check the inflation loads from the manufacturer website to make sure they are inflated correctly. I was amazed to see this condition. As mentioned, I also use wheel covers.
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Old 04-16-2012, 05:24 PM   #7
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We have talked about this many times before.....since it is between the two tires it is NOT UV damage, and since the tire pressures are keept up it is not from underinflation. The problem is caused by lack of "blooming". The term blooming is given to the process of bringing the oils and chemicals in the rubber to the surface so the rubber does not dry out and crack. Blooming is caused by the tire being heated and flexed while being driven. If you don't drive the MH enough or it sits for extended times then you don't get blooming and the tires dry out and crack. bThis is why owners of the same brand/model tire say my tires cracked or my tires didn't crack because some are getting enough blooming and some are not. I am also sure the type climate that the MH spends its time in also has an effect on the amount of blooming. In drag racing we force this blooming by doing a burnout to heat the tires before we make a run. The oils coming to the surface give us more traction.
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Old 04-16-2012, 05:59 PM   #8
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If you don't drive the MH enough or it sits for extended times then you don't get blooming and the tires dry out and crack.
Is there a consensus of how frequently and for how long you should drive to induce blooming?
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Old 04-16-2012, 06:49 PM   #9
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Don't think it is that easy to define. Driving hard for one or two months all together out of twelve months is probably not the answer
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Old 04-16-2012, 07:04 PM   #10
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Don't think it is that easy to define. Driving hard for one or two months all together out of twelve months is probably not the answer
Clearly. I was just wondering if twice a month for a couple of hours at highway speeds, or something along those lines, would be enough or should it be more frequently and/or longer.
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Old 04-16-2012, 07:26 PM   #11
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[QUOTE=Mike Canter;1146051]We have talked about this many times Blooming is caused by the tire being heated and flexed while being driven. If you don't drive the MH enough or it sits for extended times then you don't get blooming and the tires dry out and crack.


The tractor/trailers and dollies in our fleets were running virtually 24/7 and the GY tires were pretty much the only ones that had the bead cracks evident.
"Blooming"??
This is why the tires I purchased for replacements were not GY....mainly B/Stone Toyo, Michelin, some Continental.
JMHO.
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Old 04-16-2012, 08:24 PM   #12
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Quote:
Originally Posted by Mike Canter View Post
We have talked about this many times before.....since it is between the two tires it is NOT UV damage, and since the tire pressures are keept up it is not from underinflation. The problem is caused by lack of "blooming". The term blooming is given to the process of bringing the oils and chemicals in the rubber to the surface so the rubber does not dry out and crack. Blooming is caused by the tire being heated and flexed while being driven. If you don't drive the MH enough or it sits for extended times then you don't get blooming and the tires dry out and crack. bThis is why owners of the same brand/model tire say my tires cracked or my tires didn't crack because some are getting enough blooming and some are not. I am also sure the type climate that the MH spends its time in also has an effect on the amount of blooming. In drag racing we force this blooming by doing a burnout to heat the tires before we make a run. The oils coming to the surface give us more traction.
I know for race tires there are different chemicals you can purchase to increase tire life/traction... even ones that have "heat cycled" out.

On a street tire there is a finite amount of life unless the storage climate is extremely moderate. Even tires that never see sunlight in my parts shed... seem to age because of the extreme temps. Tires stored in my climate controlled garage are in far better shape (same exact model tire)
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Old 04-16-2012, 09:05 PM   #13
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If the OP's G670's are like mine, the DOT Code will be on the outside of the rear duals.

I.E. this is the face of the tire that we see everytime we look at it.

Dave
1998 American Eagle 40EVS
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Old 04-16-2012, 09:28 PM   #14
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Maybe we should rotate our tires after every trip, say like if it was 1000 miles round trip. That way we could at least see the inside tire on the duels after rotating.
Neil
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