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12-14-2017, 03:44 PM
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#15
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Senior Member
Commercial Member
Join Date: Mar 2010
Location: Akron, Ohio
Posts: 2,781
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when using "P" type tires on truck, SUV or trailer you need to "De-rate " the tire load capacity.
(Tire sidewall load) / 1.10 = new load capacity
__________________
Retired Design & Quality Tire Eng. 40+ years experience. Recognized in the industry and in court as an expert in failed tire inspection as I have performed thousands of failed tire "autopsies".
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12-14-2017, 03:47 PM
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#16
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Senior Member
Commercial Member
Join Date: Mar 2010
Location: Akron, Ohio
Posts: 2,781
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Quote:
Originally Posted by FastEagle
The TRA is an overseer of many things, but, it's still the individual tire manufacturer's responsibility to insure a tire's speed rating is justifiable. They must provide the DOT with certified testing results.
A tire's sidewall information will tell you what the basic building materials are. It will even number them. However, they never mention size. Probably confidential. Logic would seem to support larger cording sizes as being able to provide more load capacity at a given PSI than smaller sizes.
Some tires are more durable than others because of "add-ons" like sidewall protectors, an added steel belt or some sort of overlay or wedge. All good for a chance at lasting longer but none add strength in load capacity.
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" Some tires are more durable than others because of "add-ons" like sidewall protectors, an added steel belt or some sort of overlay or wedge. All good for a chance at lasting longer but none add strength in load capacity." I agree completely with that statement.
__________________
Retired Design & Quality Tire Eng. 40+ years experience. Recognized in the industry and in court as an expert in failed tire inspection as I have performed thousands of failed tire "autopsies".
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12-14-2017, 03:51 PM
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#17
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Senior Member
Commercial Member
Join Date: Mar 2010
Location: Akron, Ohio
Posts: 2,781
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Quote:
Originally Posted by Arch Hoagland
I think I'd do the exact same thing. I've had new trailer tires that came on the trailer blow out.
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Why did the tires fail? "Blowout" seems to imply a "Run Low Flex Failure" but may be confused with e "Belt Separation" to the untrained eye.
Suggest you review THIS post.
__________________
Retired Design & Quality Tire Eng. 40+ years experience. Recognized in the industry and in court as an expert in failed tire inspection as I have performed thousands of failed tire "autopsies".
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12-14-2017, 07:34 PM
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#18
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,103
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Quote:
Originally Posted by Tireman9
Why did the tires fail? "Blowout" seems to imply a "Run Low Flex Failure" but may be confused with e "Belt Separation" to the untrained eye.
Suggest you review THIS post.
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They were Goodyear tires and there was a recall on them. I contacted a Goodyear dealer about it and he said my tires were OK. A month later on a trip across Nevada one blew a hole in the sidewall about the size of an orange and the other tire shredded with the added weight.
I had just checked the pressures that morning and all was fine. I always check my tire pressures and these were no exception. Les Schwab came to my rescue 10 miles east of Winnamucca, NV on I80 and replaced both tires with another brand. I then went into their shop in Winnamucca and had the other two tires replaced.
I have since talked to many RVers pulling trailers and most of them have had blowouts with original tires.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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12-16-2017, 01:36 PM
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#19
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Senior Member
Commercial Member
Join Date: Mar 2010
Location: Akron, Ohio
Posts: 2,781
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Quote:
Originally Posted by Arch Hoagland
They were Goodyear tires and there was a recall on them. I contacted a Goodyear dealer about it and he said my tires were OK. A month later on a trip across Nevada one blew a hole in the sidewall about the size of an orange and the other tire shredded with the added weight.
I had just checked the pressures that morning and all was fine. I always check my tire pressures and these were no exception. Les Schwab came to my rescue 10 miles east of Winnamucca, NV on I80 and replaced both tires with another brand. I then went into their shop in Winnamucca and had the other two tires replaced.
I have since talked to many RVers pulling trailers and most of them have had blowouts with original tires.
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Checking the pressure at 9AM is no guarantee the tire didn't get a puncture as you pulled out of the campground or that the valve core didn't get stuck and allow a slow leak. My blog post on 'Real Life Blowout" shows how sidewall failures happen.
If there was a recall on the tires but you chose to not replace them seems like that was your decision to ignore the recall notice.
__________________
Retired Design & Quality Tire Eng. 40+ years experience. Recognized in the industry and in court as an expert in failed tire inspection as I have performed thousands of failed tire "autopsies".
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12-17-2017, 12:33 AM
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#20
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,103
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Quote:
Originally Posted by Tireman9
Checking the pressure at 9AM is no guarantee the tire didn't get a puncture as you pulled out of the campground or that the valve core didn't get stuck and allow a slow leak. My blog post on 'Real Life Blowout" shows how sidewall failures happen.
If there was a recall on the tires but you chose to not replace them seems like that was your decision to ignore the recall notice.
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I went to a Goodyear dealer about the recall and he told me the tires were fine.
Believe me I wouldn't have kept the tires on it if the dealer said they were bad.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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05-24-2018, 04:02 PM
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#21
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Senior Member
Join Date: Sep 2012
Location: Palm Coast Florida
Posts: 12,995
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There are too many rubber compound formulas to speculate. I can believe 2 tires of the same size as one being junk and one being better than junk.
You can get different speed rating in the same size car tires for years.
I tow at 70 - 72mph to keep up with right lane traffic. I welcome the higher speed rating.
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05-25-2018, 11:37 AM
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#22
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Senior Member
Commercial Member
Join Date: Mar 2010
Location: Akron, Ohio
Posts: 2,781
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I am writing a long detailed blog post on tire speed ratings.
Individual post answers are takinftoo much time and too many simply do not like the answer I give based on actual tire engineering facts.
Hope to post June 1
__________________
Retired Design & Quality Tire Eng. 40+ years experience. Recognized in the industry and in court as an expert in failed tire inspection as I have performed thousands of failed tire "autopsies".
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06-04-2018, 01:51 PM
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#23
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Senior Member
Join Date: Jul 2017
Posts: 2,582
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^ Which can now be found here.
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