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Old 05-09-2015, 03:24 PM   #239
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Here are a couple of photos of my 5 year old Michelin XZA-2 Energy Tires that I just took today while sitting at Southpark RV Park in Prince George BC on our way to Alaska.

The photos are of the worst area around the outside of the tires. It does not go all the way around the tire.

My drive tires are Bridgestone's and they show no checking/cracking at all. They were all put on at the same time.

These tires have not been abused or curbed or driven in huge pot holes except for the terrible roads in parts of California which sometimes feels like road bombs when you hit them.

They have made two previous trips to Alaska and are now on their third. They also went to the east coast and spent some time running up and down the coast following the good weather. They have been covered sometimes and others not. I am not consistent with using my covers.

They have well over 30,000 miles on then to date.

This blemish I am not really worried about as mostly ALL Michelin tires seem to crack like that at sometime or another.

The plan is to "think" about changing tires once I get to Florida sometime in 2016 or 2017. Or maybe I will just play it by ear.
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Old 05-10-2015, 08:16 AM   #240
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As mentionned previously, my Michelin are 11 years old, and do not show any crack yet, and have only 30000 miles, so I'm still questionning if I should replace them, mostly because we don't know how long we'll keep the motorhome
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Old 05-10-2015, 01:19 PM   #241
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Originally Posted by Annadia1 View Post
As mentionned previously, my Michelin are 11 years old, and do not show any crack yet, and have only 30000 miles, so I'm still questionning if I should replace them, mostly because we don't know how long we'll keep the motorhome

Michelin states that any tire in service at 10 years of age should be taken out of service.


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Old 05-10-2015, 05:35 PM   #242
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Sidewall cracking, in itself is seldom a problem. It is however an indication of potential problems with over-age internal components.

I guess you could think of this like Blood Pressure or your Temperature. high BP or high Temp are a symptom or indication of other things that the Dr needs to check out.

However if you probe the cracks or cuts in a tire and see any cords you should have the tire replaced at once, no matter the age.

I believe Michelin even has a statement on the max depth for cracks indicating the tire should be replaced even if no cords are visible.

All rubber in a tire gets old with time. The rate the rubber ages is also temperature dependent.

I guess we could use the 10 year normal RV service as an indication of the loss in flexibility of internal compounds. If you run your tires in hot climate or faster than suggested or at higher load or lower inflation the heat will be higher.

It is well established chemistry that for each increase in temperature of about 20F the rate a tire ages doubles.

This means for example a 1,000 total hours at say 160F would have the same affect as 2,000 total hours at 140F or 4,000 total hours at 120F.

Since we all travel in different locations at different speeds and inflations and loads this is why there is no one answer fits all applications.

The best we engineers can do is to provide general guidelines.
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Old 05-10-2015, 09:01 PM   #243
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Originally Posted by Annadia1 View Post
As mentionned previously, my Michelin are 11 years old, and do not show any crack yet, and have only 30000 miles, so I'm still questionning if I should replace them, mostly because we don't know how long we'll keep the motorhome
Well, in my opinion, those tires are no longer safe to drive on.

So, as long as you're not planning to drive on them, you can keep them as long as you like.

Please forgive my sarcasm.

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Old 05-11-2015, 08:17 AM   #244
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FWIW aside from not wanting to drive it as is. As a potential buyer I would be checking date codes and factoring in the cost of a new set of tires in any offer I would make on a unit. Tires are a significant enough cost to be a deal maker or breaker on unit more than a few years old.
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Old 05-11-2015, 10:32 AM   #245
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Old 05-11-2015, 09:40 PM   #246
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Originally Posted by Annadia1 View Post
As mentionned previously, my Michelin are 11 years old, and do not show any crack yet, and have only 30000 miles, so I'm still questionning if I should replace them, mostly because we don't know how long we'll keep the motorhome
In my opinion, I would not replace them at all until they show at least SOME signs of cracking or wear. You obviously have taken good care of your tires and should reap some of the benefits of having done so.
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Old 05-12-2015, 08:42 AM   #247
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Here is an interesting twist for the don't replace until folks. If a out of date tire fails and causes you to have an accident the insurance company may refuse part of your claim. I understand if your accident closes the highway for more than 4 hours the state or county can charge you. Hmmm. I think there are other considerations about tires we are ALL missing. Yea think?

Are you really certain you want to continue using tires outside of the manufactures end of useful life recommendations?
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Old 05-13-2015, 07:22 AM   #248
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Originally Posted by jerichorick View Post
Here is an interesting twist for the don't replace until folks. If a out of date tire fails and causes you to have an accident the insurance company may refuse part of your claim. I understand if your accident closes the highway for more than 4 hours the state or county can charge you. Hmmm. I think there are other considerations about tires we are ALL missing. Yea think?

Are you really certain you want to continue using tires outside of the manufactures end of useful life recommendations?
Hummmm! I couldn't find anywhere in my MH Insurance contract that I would have to pay for any highway closer over 4 hours.
Nor if I cause a accident with using tires over a certain age.
If your says that, it may be time to change providers.

I would like to see any link you have from any tire manufacture that says to replace after 10 years other then Michelin.

Michelin Says:
Service Life for RV/Motorhome Tires
The following recommendation applies to RV/Motorhome tires. Tires are composed of various types of material and rubber compounds, having performance properties essential to the proper functioning of the tire itself. These component properties evolve over time.
For each tire, this evolution depends upon many factors such as weather, storage conditions, and conditions of use (load, speed, inflation pressure, maintenance, etc.) to which the tire is subjected throughout its life.

This service-related evolution varies widely so that accurately predicting the serviceable life of any specific tire in advance is not possible.

That is why, in addition to regular inspections and inflation pressure maintenance by
consumers, it is recommended to have RV/Motorhome tires, including spare tires, inspected regularly by a qualified tire specialist, such as a tire dealer, who will assess the tire’s suitability for continued service.

Tires that have been in use for 5 years or more should continue to be inspected by a specialist at least annually.
Consumers are strongly encouraged to be aware not only of their tires’ visual condition and inflation pressure, but also of any change in dynamic performance such as increased air loss, noise or vibration, which could be an indication that the tires need to be removed from service to prevent tire failure.

It is impossible to predict when tires should be replaced based on their calendar age alone.

However, the older a tire the greater the chance that it will need to be replaced due to the service-related evolution or other conditions found upon inspection or detected during use.
While most tires will need replacement before they achieve 10 years, it is recommended that any tires in service 10 years or more from the date of manufacture, including spare tires, be replaced with new tires as a simple precaution even if such tires appear serviceable and even if they have not reached the legal wear limit.
For tires that were on an original equipment vehicle (i.e., acquired by the consumer on a new vehicle), follow the vehicle manufacturer’s tire replacement recommendations, when specified (but not to exceed 10 years).

The date when a tire was manufactured is located on the sidewall of each tire. Consumers should locate the Department of Transportation or DOT code on the tire that begins with DOT and ends with the week and year of manufacture. For example, a DOT code ending with “0304” indicates a tire made in the 3rd week (Jan) of 2004.

Good Year has NO life recommendation.

Removal conditions:
Tires should be removed from service for several reasons, including tread worn down to minimum depth, signs of damage (cuts, cracks, bulges, etc.) or damage caused by underinflating or overloading.
Below are some recommendations for specific issues:
Sidewall weather cracking.
Weather cracking is a naturally occurring condition that most often appears as crazing and/or cracking in the flex area of the sidewall.
Probable causes of sidewall weather cracking include:
• Long periods of inactivity or storage.
• Direct exposure to sunlight.
• Exposure to high levels of ozone from sources such as smog and electrical generators.
• Excessive washing.
• Using alcohol and/or petroleum-based cleaners.

If a tire has weather cracks deeper than 2/32'' – or if internal components such as steel or fabric body plies are visible – the tire should be replaced. shallow tread depth.
Tires should be removed from service if the tread wears down to 2/32nds of an inch. Also, federal regulations state that tires on the front axle of vehicles with a GVWR in excess of 10,000 pounds should be removed when worn to 4/32nds of an inch tread depth.

Consult your local retailer to determine the tread depth of your tires
and whether they need to be replaced.

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Old 05-13-2015, 08:20 AM   #249
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What is the usefull life of your tires? I guess it depends on many factors, including the manufacturer built in problems.

Will the manufacturers come up with a real life expentency on their tires? What if the tire blowout before the expected life? Ho, now it will depends on inflation, potholes, heat, sun, ciment, gravel, tire that does not roll enough....so on.

Two major brand with major issues: Michelin cracking, Goodyear rivering, and they keep going with their built in problems.

Category: tire-aging | Safety Research & Strategies, Inc.

Goodyear Motorhome tires: Category: goodyear-tire | Safety Research & Strategies, Inc.

Michelin
Category: michelin | Safety Research & Strategies, Inc.

Hercules recall: Search | Safety Research & Strategies, Inc.
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Old 05-13-2015, 08:42 AM   #250
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Quote:
Originally Posted by jerichorick View Post
Here is an interesting twist for the don't replace until folks. If a out of date tire fails and causes you to have an accident the insurance company may refuse part of your claim. I understand if your accident closes the highway for more than 4 hours the state or county can charge you. Hmmm. I think there are other considerations about tires we are ALL missing. Yea think?

Are you really certain you want to continue using tires outside of the manufactures end of useful life recommendations?
Here we go again with the fear-mongering...."What IF?" "They COULD" "I have HEARD".... reminds me of a subject I started on toad braking systems a while back...some of the worry-warts were even calling me names before it was over.
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Old 05-13-2015, 08:57 AM   #251
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Quote:
Originally Posted by jerichorick View Post
Here is an interesting twist for the don't replace until folks. If a out of date tire fails and causes you to have an accident the insurance company may refuse part of your claim. I understand if your accident closes the highway for more than 4 hours the state or county can charge you. Hmmm. I think there are other considerations about tires we are ALL missing. Yea think?

Are you really certain you want to continue using tires outside of the manufactures end of useful life recommendations?
Very interesting point, and I want to thank you all for sharing your observations
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Old 05-13-2015, 09:49 AM   #252
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Hummmm! I couldn't find anywhere in my MH Insurance contract that I would have to pay for any highway closer over 4 hours.
Nor if I cause a accident with using tires over a certain age.
If your says that, it may be time to change providers.

I would like to see any link you have from any tire manufacture that says to replace after 10 years other then Michelin.

Michelin Says:
Service Life for RV/Motorhome Tires
The following recommendation applies to RV/Motorhome tires. Tires are composed of various types of material and rubber compounds, having performance properties essential to the proper functioning of the tire itself. These component properties evolve over time.
For each tire, this evolution depends upon many factors such as weather, storage conditions, and conditions of use (load, speed, inflation pressure, maintenance, etc.) to which the tire is subjected throughout its life.

This service-related evolution varies widely so that accurately predicting the serviceable life of any specific tire in advance is not possible.

That is why, in addition to regular inspections and inflation pressure maintenance by
consumers, it is recommended to have RV/Motorhome tires, including spare tires, inspected regularly by a qualified tire specialist, such as a tire dealer, who will assess the tire’s suitability for continued service.

Tires that have been in use for 5 years or more should continue to be inspected by a specialist at least annually.
Consumers are strongly encouraged to be aware not only of their tires’ visual condition and inflation pressure, but also of any change in dynamic performance such as increased air loss, noise or vibration, which could be an indication that the tires need to be removed from service to prevent tire failure.

It is impossible to predict when tires should be replaced based on their calendar age alone.

However, the older a tire the greater the chance that it will need to be replaced due to the service-related evolution or other conditions found upon inspection or detected during use.
While most tires will need replacement before they achieve 10 years, it is recommended that any tires in service 10 years or more from the date of manufacture, including spare tires, be replaced with new tires as a simple precaution even if such tires appear serviceable and even if they have not reached the legal wear limit.
For tires that were on an original equipment vehicle (i.e., acquired by the consumer on a new vehicle), follow the vehicle manufacturer’s tire replacement recommendations, when specified (but not to exceed 10 years).

The date when a tire was manufactured is located on the sidewall of each tire. Consumers should locate the Department of Transportation or DOT code on the tire that begins with DOT and ends with the week and year of manufacture. For example, a DOT code ending with “0304” indicates a tire made in the 3rd week (Jan) of 2004.

Good Year has NO life recommendation.

Removal conditions:
Tires should be removed from service for several reasons, including tread worn down to minimum depth, signs of damage (cuts, cracks, bulges, etc.) or damage caused by underinflating or overloading.
Below are some recommendations for specific issues:
Sidewall weather cracking.
Weather cracking is a naturally occurring condition that most often appears as crazing and/or cracking in the flex area of the sidewall.
Probable causes of sidewall weather cracking include:
• Long periods of inactivity or storage.
• Direct exposure to sunlight.
• Exposure to high levels of ozone from sources such as smog and electrical generators.
• Excessive washing.
• Using alcohol and/or petroleum-based cleaners.

If a tire has weather cracks deeper than 2/32'' – or if internal components such as steel or fabric body plies are visible – the tire should be replaced. shallow tread depth.
Tires should be removed from service if the tread wears down to 2/32nds of an inch. Also, federal regulations state that tires on the front axle of vehicles with a GVWR in excess of 10,000 pounds should be removed when worn to 4/32nds of an inch tread depth.

Consult your local retailer to determine the tread depth of your tires
and whether they need to be replaced.

And what do these companys do??? They sell tires!!!!!!!!!!!!!!
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