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Old 06-28-2008, 08:25 PM   #1
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Blow outs

I have had three blowouts in one year using factory spec Goodyear Marathon D rated tires on my 25 Safari. I am careful about 65 lb pressure, driving under 65 and watching extra weight. The last blowout was from a dealer installed Marathon less than three months old. I tow quite a few miles in the South and Southwest in extremely hot conditions. I had a four figure trailer tire bill in the past year. (One of my Marathons failed last year due to a road hazard and I replaced two others because they were more than three years old)
Goodyears are made in China these days and no better than no name tires.
Manufacturing trailer tires these days is all about counting beans. Your Goodyear Marathon is no better than the "Towright" or "Pinacle" sold at flybynight tire stores at most interstate exits in hot country.
I run load range E tires made by Maxxis and Carlise inflated to 80 lbs. I notice no difference in ride or handling. I don't have enough experience to say that load range E tires have solved my tire problems but I have run 1500 miles without a blowout.
Rather than stonewalling and saying that "if E rated tires were better Airstream would have speced them", I would like to see a premium trailer manufacturer (Airstream) and its dealers say "we have a problem with our tires and we are going to fix it."
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Old 06-28-2008, 08:39 PM   #2
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Look to see how old the tires are. I bought 5 tires for my boat trailer last month. 4 were made in 2008. One was made in 2006. So it has been sitting in storage for some time. I do not expect it to last long in the triple digit air temps and asphalt temps in the 150's for the next month or two.

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Old 06-29-2008, 12:12 AM   #3
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Quote:
Originally Posted by handn View Post
I have had three blowouts in one year using factory spec Goodyear Marathon D rated tires on my 25 Safari. I am careful about 65 lb pressure, driving under 65 and watching extra weight. The last blowout was from a dealer installed Marathon less than three months old. I tow quite a few miles in the South and Southwest in extremely hot conditions. I had a four figure trailer tire bill in the past year. (One of my Marathons failed last year due to a road hazard and I replaced two others because they were more than three years old)
Goodyears are made in China these days and no better than no name tires.
Manufacturing trailer tires these days is all about counting beans. Your Goodyear Marathon is no better than the "Towright" or "Pinacle" sold at flybynight tire stores at most interstate exits in hot country.
I run load range E tires made by Maxxis and Carlise inflated to 80 lbs. I notice no difference in ride or handling. I don't have enough experience to say that load range E tires have solved my tire problems but I have run 1500 miles without a blowout.
Rather than stonewalling and saying that "if E rated tires were better Airstream would have speced them", I would like to see a premium trailer manufacturer (Airstream) and its dealers say "we have a problem with our tires and we are going to fix it."
65 psi for your rig, I believe, is way to high. I would drop it to 55 psi.

I would also strongly suggest that you balance the running gear, that is the tire, wheel and hub and drum, as an assembly.

Unbalanced running gear, also contributes to many blow outs.

Andy
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Old 06-29-2008, 09:18 AM   #4
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Maybe we could get the people to chime in here, that use Centramatics, and have had their tires balanced, along with their running gear, as far as number of catastrophic air loss (blowouts) they have experienced. I know vibration does a lot of bad things, but if the tires are so unbalanced they cause the tire to "hop" slightly, they may be momentarily exceeding their weight ratings with every bounce. Eventually, all those "momentaries" add up to "quite a while", resulting in tire failure. E range tires have a higher weight rating, so they may not exceed their weight rating when they "bounce" from unbalance.
This is only a theory at this point, but may help explain a lot as far as tire failure.
Just a simple "we used Centramatics, and had X number of tire failures", or a "we don't, and have had X number of tire failures", or "we don't balance our tires, and we had X number of tire failures".
This would be more useful to us as a forum than bashing a tire or trailer brand, maybe we can find a common factor.
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Old 06-29-2008, 09:42 AM   #5
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i think andy hit on something with his post about tire twist when making sharp turns. the first time i saw it i was shocked. i can see how LT or under inflated tires would be even more prone to this. clearly, trailer tires need to be improved!
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Old 06-29-2008, 09:46 AM   #6
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Quote:
Originally Posted by richinny
i think andy hit on something with his post about tire twist when making sharp turns. the first time i saw it i was shocked. i can see how LT or under inflated tires would be even more prone to this. clearly, trailer tires need to be improved!
Hmmm...How about a dual-wheel, single-axle trailer? No tire twist, less running gear to maintain, how would it affect sway issues?
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Old 06-29-2008, 09:52 AM   #7
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How much do radial tires (and a more flexible sidewall) add to tire twist and blowouts? I wonder if biased ply tires with a stiff sidewall would help eliminate blowouts. Just a thought.
Tom
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Old 06-29-2008, 10:09 AM   #8
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Quote:
Originally Posted by tlavergne View Post
How much do radial tires (and a more flexible sidewall) add to tire twist and blowouts? I wonder if biased ply tires with a stiff sidewall would help eliminate blowouts. Just a thought.
Tom
i've been wondering the same things.
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Old 06-29-2008, 10:12 AM   #9
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Balance the tire, wheel, hub and drum

Quote:
Originally Posted by Inland RV Center, In View Post
65 psi for your rig, I believe, is way to high. I would drop it to 55 psi.

I would also strongly suggest that you balance the running gear, that is the tire, wheel and hub and drum, as an assembly.

Unbalanced running gear, also contributes to many blow outs.

Andy
Where do you go to have the tire, wheel, hub and drum assembly balanced?
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Old 06-29-2008, 10:32 AM   #10
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I have actual experience with the OEM Load Range D Goodyear Marathons vs. Load Range E Maxxis.

We have a 2005 Safari 25FB, named Lucy, that we purchased new in June, 2006. We use Lucy a bunch and by May of 2007, we had already logged about 11,000 miles and 150 nights on the road. We are very meticulous about checking our towing gear and check tire pressure daily on the road.

In May of 2007, we set out on an epic journey to see the the National Parks in Wyoming and Montana. This journey is chronicled on these Forums under the string title, "Lucy's Great Excursion" which includes descriptions and photos of our "tire blowout adventures".

To make a long story short, we had three of the OEM Marathons blowout on the highway (two in the same day). We bought a complete set of Maxxis E's, and we run them at 72 psi. The Goodyears had failed within 12,000 miles. We have now put just over 20,000 miles on the Maxxis with no tire failures or problems.

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Old 06-29-2008, 11:06 AM   #11
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Running gear balance

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Originally Posted by SteSpot View Post
Where do you go to have the tire, wheel, hub and drum assembly balanced?
We use the following equipment and procedure to balance the running gear.

Wheel Balancing Photos - Inland RV

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Old 06-29-2008, 11:18 AM   #12
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This stuff works!

We used to use the tire truer and strobes on the race car. The stuff is still out there , find someone who uses their stuff if you are not close to Andy's shop!
Amermac, Inc. - Tire Truers and Balancers - Ellaville, GA

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Old 06-29-2008, 11:49 AM   #13
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There is also a process called "match balance", where the tire/rim assembly is rotated at a speed or around 20mph or so while on the vehicle. The machine shaves tiny bits of rubber off the heavy part of the assembly until balance is achieved. This is roughly the equivalent of a high speed running gear balance. There are, of course drawbacks to this, such as if a tire has to be removed from the wheel for repair, it would have to be "rematched".
Western Auto and Sears both used to do this, but I don't know who currently has the equipment.
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Old 06-29-2008, 11:52 AM   #14
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Re balancing,
The same thing can be accomplished using a wheel spinner that spins the wheel/tire assembly up while still mounted to the vehicle.
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