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Old 06-13-2016, 03:14 AM   #11
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Thanks for all the great info, here and on your blog also. How important is it for tire longevity to periodically put some miles on trailer tires. I just got 5 new tires and am thinking that if the spare never gets rotated into the mix it's not aging as well as the other 4 because there is no working of the rubber compounds in that tire. Does that set me up for it to fail if I ever have to use it?
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Old 06-13-2016, 09:04 AM   #12
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Another angle. I posted this in another section of the forum in response to a tire inflation question. I was a Tire Construction Engineer at Dunlop Tire.

Quote:
When I was at Dunlop, I do not remember a single failure of the load test. I do not know about other tire brands, or trailer tires.

What I am saying is, tire failures are probably due to impact (potholes and sharp objects), low pressure, or excessively high speed. Or combinations of those. That is my opinion. YMMV.

I am seriously considering some kind of TPMS for my camper tires. My concern is, if I have a puncture or some other reason for low pressure, I would just keep driving because I would have no way of knowing.
Of course overload would be another cause, but that is pretty easy to control. Hopefully people are choosing the correct tire for the application.
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Old 06-13-2016, 09:19 AM   #13
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Originally Posted by mordecai View Post
Thanks for all the great info, here and on your blog also. How important is it for tire longevity to periodically put some miles on trailer tires. I just got 5 new tires and am thinking that if the spare never gets rotated into the mix it's not aging as well as the other 4 because there is no working of the rubber compounds in that tire. Does that set me up for it to fail if I ever have to use it?

While I have read many posts that suggest that you will get longer life from tires if you "exercise" them I have not seen any actual test data that supports this.

The intent of this thread was to try and summarize what I consider "best practices" for tire life longevity, while at the same time trying to keep the level of activity involving tires to a reasonable low level.

RE Spare.
Here I would want to keep it as cool as possible and out of direct sunlight (UV) and if possible away from excess ozone. Of these three negative conditions staying cool is the biggest bang for the buck.

UV and Ozone attack the exterior of a tire and long term exposure to either of these conditions can result is undesirable cosmetic condition of cracking on the surface of the tire. Sometimes the misnomer "Dry Rot" is used.

Heat however can hurt the structure of a tire and this can lead to actual failure.

Ozone and other forms of air pollution are pretty hard to avoid and unless you can place the spare in a sealed trash bag I don't know of any way to reasonably protect a tire.

UV is a little easier. Keep the tire out of direct sunlight. Again a plastic bag will work. So will tire covers or even a sheet of cardboard or lumber. In other words you can drastically reduce the exposure to UV with almost anything.

Heat is the tire killer. I have written in my blog how temperature accelerates the aging process of tires with the rate doubling with each increase of 18F.
So =+18 = x2
+36 = x4
+54 = x8

Tires run hotter when the inflation is lower. They are being heated by the sun when sitting at a campground in full sunlight and they are BAKED if stored under a a black cover and fried when hung off the back of an RV or SUV.

Here is my blog post on Tire Covers with data to show just how helpful they can be.

Here is what I have done. My spare is mounted inside my large storage bay. I have white covers that I use whenever parked for a day at a campground.

Only time I do not use the white covers is when at home, in the "car port" that provides full shade or when camping in the rain.

I keep the tires clean by washing with the same soap I use on the side of my RV and I only use an old cloth as stiff bristle can leave microscopic scratches on the surface and will remove the "wax" and UV protectants built into all tires.

I see no reason why the spare could not be "rotated" into the mix with the other 4 tires and that might improve the longevity of the set.

I assume of course that you have confirmed that no tire is overloaded.
Be sure to do an annual inspection and to keep the TT tires fully inflated to the pressure on the sidewall.

As Tony suggested the use of TPMS on the ground tires will help with their longevity. I do check the pressure in my spare at least once a season.
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Old 06-13-2016, 10:06 AM   #14
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Tireman; are you aware of any protective coatings that offer uv or ozone protection to tires? The auto parts houses only sell spray tire cleaners. Some car dealers have a "tire black" that makes the tire sidewall shine, but I'm not sure how effective they are.

One woukd think that some company has a product that protects tires from uv.

And by the way, Thank you for the great information you provide on this forum and on your website. Woukd you mind posting the link to your website again? I recently replaced my tablet and lost the url.

Thanks
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Old 06-13-2016, 10:17 AM   #15
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Tireman9: I see no reason why the spare could not be "rotated" into the mix with the other 4 tires and that might improve the longevity of the set. I can see what you are saying here; But I have also read that you do not rotate trailer tires the same way you rotate car or truck tires? You are to only rotate the back to the front on the same side. Is this a false statement that I have read? Thanks for your great info.
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Old 06-13-2016, 10:32 AM   #16
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Originally Posted by Witch Doctor View Post
Tireman9: I see no reason why the spare could not be "rotated" into the mix with the other 4 tires and that might improve the longevity of the set. I can see what you are saying here; But I have also read that you do not rotate trailer tires the same way you rotate car or truck tires? You are to only rotate the back to the front on the same side. Is this a false statement that I have read? Thanks for your great info.
I think the "keep same direction of rotation" is old information from the 70's when radials were new and tire companies were still learning how to make more durable radials.
I would not worry about direction unless you had a tire that had rotation direction indicated on the sidewall and that is usually only for snow or wet performance improvement.
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Old 06-13-2016, 10:48 AM   #17
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Quote:
Originally Posted by Tireman9 View Post
I think the "keep same direction of rotation" is old information from the 70's when radials were new and tire companies were still learning how to make more durable radials.
I would not worry about direction unless you had a tire that had rotation direction indicated on the sidewall and that is usually only for snow or wet performance improvement.
Okay thanks I figured you would know, a lot of mis info on the internet. Also you asked what my TST system was at when I had my blow out. I didn't have TST then I never even knew about them 4 years ago. I just checked every morning that I was at 50 lbs PSI as rated. I bought them after from the advice of OC and reading your blog. Saved my bacon last trip, had a leak, without that warning I'm sure I would have shredded that tire to. I'm still a little confused about the correct PSI. I have switched to the "D" rated at 65 PSI from the "C" rated 50 PSI. To me if I run those tires at 50 PSI which is enough for my load, it is really 15 lbs from the CRP of the sidewall, isn't that being under inflated for the tire not the load. This has been debated many times on this forum. So I inflate to the sidewall 65 Lbs. Don't mean to drive you crazy...
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Old 06-13-2016, 02:42 PM   #18
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Originally Posted by Davidg View Post
Tireman; are you aware of any protective coatings that offer uv or ozone protection to tires? The auto parts houses only sell spray tire cleaners. Some car dealers have a "tire black" that makes the tire sidewall shine, but I'm not sure how effective they are.

One woukd think that some company has a product that protects tires from uv.

And by the way, Thank you for the great information you provide on this forum and on your website. Woukd you mind posting the link to your website again? I recently replaced my tablet and lost the url.

Thanks
Link to my blog in in my signature but since you asked nicely
RV Tire Safety

RE spray on stuff.
I realize that almost anyone can mix up some stuff and make claims about protecting tire sidewall but I don't see anyone offering a warranty if you use the product or a side by side comparison on tires on an RV.

UV can damage tires but if you take other precautions such as White covers you get MUCH better UV protection plus heat protection.

The ones pushing UV spray are the ones selling the product.

We tell people not to use petroleum based products on tires but last week at RV show I saw a $450,000 45' unit with very shiny tires. I wiped my finger on the sidewall then put finger in water. Water beaded up immediately indicating what to me appeared to be a petroleum based product being used.
IMO just another example of RV salesmen pushing smoke, lights and mirrors over substance.

I have used "No Touch" brand foaming stuff on my tires but it washes off if/when you drive in rain so many may not like it. Also not as shiny as some want.
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Old 06-20-2016, 07:46 AM   #19
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Had this happen yesterday. Wondering if it is actual tire failure due to low pressure.
Stats. Right inner, Sunseeker
Speed 55. Checked before leaving CG
Click image for larger version

Name:	ImageUploadedByForest River Forums1466423136.396928.jpg
Views:	130
Size:	97.8 KB
ID:	111638Click image for larger version

Name:	ImageUploadedByForest River Forums1466423157.899416.jpg
Views:	122
Size:	94.3 KB
ID:	111639Click image for larger version

Name:	ImageUploadedByForest River Forums1466423181.628853.jpg
Views:	152
Size:	110.8 KB
ID:	111640

Any thoughts?
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Old 06-20-2016, 04:27 PM   #20
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I see a lot of 5th wheelers jumping curbs. Also lots of deep sharp edged pot holes. This can't be good for tires.
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