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Old 04-11-2011, 12:23 PM   #15
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The 7 year replacement recommendation comes from the DOT, not the tire manufacturers. Unfortunately, unlike Twinkies, tires do not have an unlimited shelf life. The moment the tire pops out of the mold, the tread compound starts to deteriorate. A tire sitting even in a dark, air-conditioned warehouse for 7 years is not safe to be mounted on a wheel. It has lost enough of its flexibility to be usefull only as a boat bumper or a tire swing.
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Old 04-11-2011, 12:39 PM   #16
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My tires are approaching the time based replacement recommendation. I confess to some reluctance to do so, mainly because of the stories I have read about new tires failing. I want to have some confidence that new tires wouldn't paradoxically put me at greater risk of tire failure. To bad we do not have available data for tire failure. It would be awful to replace all the rubber because of fear of blow outs only to precipitate one by replacing tires that might have been OK to start with.
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Old 04-11-2011, 01:23 PM   #17
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Quote:
Originally Posted by Patrick Cody View Post
The 7 year replacement recommendation comes from the DOT, not the tire manufacturers. Unfortunately, unlike Twinkies, tires do not have an unlimited shelf life. The moment the tire pops out of the mold, the tread compound starts to deteriorate. A tire sitting even in a dark, air-conditioned warehouse for 7 years is not safe to be mounted on a wheel. It has lost enough of its flexibility to be usefull only as a boat bumper or a tire swing.
Do you have a link or source for this recommendation?
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Old 04-11-2011, 02:12 PM   #18
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Originally Posted by GCinSC2 View Post
tsupler,

As you work thru this question, please review the plethora of GYM threads, both good and bad GYM reviews.......... GYM's are now all gone.

Good luck.

Gary
What's a GYM?
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Old 04-11-2011, 02:51 PM   #19
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I've replaced tires every 5 years for the past 30 years of trailering. In that course of time I've had one tire failure. That being a Marathon that threw a chunck of tread after it's 4th season of service. Luckily the tire held together and I didn't experience the deflation until I was backing the trailer into my driveway after a trip home from Branson. The pivot was enough to break the exposed belts from the missing tread area.

As noted by others the cost of repairing the damage caused by the steel belts shreading your wheel wells and surrounding aluminum sking is much greater than the cost of the tires along with the dangers and inconvenience of being on the side of a road with a bad tire.

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Old 04-12-2011, 06:44 PM   #20
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Quote:
Originally Posted by Michigander View Post
What's a GYM?
Michigander,

Rereading my post, I didn't do too well on this one.

GYM = GoodYear Marathon.

My statement about GYM's all gone refers to the GYM's (2 sets) that used to be on my trailer.

Sorry for the confusion.

Good luck.
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Old 04-12-2011, 09:01 PM   #21
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What about the GYM? Is there anything better for a 2005 19' Safari?
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Old 04-12-2011, 09:48 PM   #22
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my trailer is an 'o6 and I had no idea how the tires had been used, but inspection of the man. date revealed '05, so I just replaced all five tires with GYMs.
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Old 04-13-2011, 07:45 PM   #23
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If the trailer is garage kept when not in use, does that make a difference on when to replace tires? We've already replaced all of ours after a blowout last December (right at about five years), but just wondering for next time.
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Old 04-15-2011, 03:49 AM   #24
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Our local Discount Tire and Costco both recently recommended 6 years max on tires (if I recall correctly), based on Michelin's recommendation (I don't think they honor warranty claims after 6 years).
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Old 04-15-2011, 03:31 PM   #25
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Thanks for all the feedback

Again, thanks everyone for the very cogent feedback. I just got back from the tire store and put ST225/75R-15 Maxxix M8008 load rated E on all 5 wheels. Ended paying $128/tire, which included install, though I paid a bit extra to have all 5 tires balanced and dispose of the old tires. Happy to have it done locally and seemed to run a bit smoother on the way home... This board is great and I look forward to running into some of you all at Airstream events down the road. All the best.

Tim
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Old 04-15-2011, 06:55 PM   #26
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Quote:
Originally Posted by tsupler View Post
I took all four tires to 60PSI before we pulled out of the driveway.
tsupler.... You noted that you filled your tires to 60PSI. The recommended pressure for the Goodyear ST225/75 R15 is 65 PSI. The ST225/75 R15 is rated for 2,540 lb load at 65 PSI. At 60 PSI the tire's load rating drops 160 lbs to 2,380 lbs. By dropping the pressure 5 PSI you have reduced the load capacity by 6.3% and reduced the total load capacity of four tires by 640 lb. I don't think the 5 PSI difference was the reason for your problem but you should keep in mind the reduction in load capacity by not running at the rated pressure. A copy of Goodyear's Tire Inflation Document is attached.
Attached Files
File Type: pdf Goodyear Tire Inflation.pdf (74.0 KB, 13 views)
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