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03-05-2015, 10:19 AM
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#61
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Rivet Master
Commercial Member
Ravenna
, Ohio
Join Date: Apr 2012
Posts: 1,344
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Quote:
Originally Posted by J. Morgan
Who here disagrees that a tire with internal damage resulting from being driven under inflated usually always displays external evidence of this damage via bulges, lumps, uneven sidewalls, or knots on the sidewall or tread area?
In short, the damage to the interior of a tire USUALLY becomes visible on the exterior.
The application of common sense sense goes a long way.
I can't remember the last time I was stuck on the side of the road with a failed tire or even a flat. Perhaps 20 years or more?
Part of this is what is called "luck", but part of this is paying attention to my tires.
1/2 Ton 4WD Truck, 72 Sovereign Hensley Arrow
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" usually always"
Careful SteveH and r_Carl don't like these less than definitive yes or no clear cut answers.
__________________
Retired tire engineer (50 years). Write a blog on RV Tire Safety Net. Give seminars for FMCA across the US. Tucson AZ in Mar 2024 is next.
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03-06-2015, 04:56 AM
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#62
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CapriRacer
I'm in the
, US
Join Date: Sep 2012
Posts: 989
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Quote:
Originally Posted by A W Warn
For my trailer tires use these (lowest load to highest load)
For tire # 1 of 4:
Tire size = ST225/75-R15 load range E
Tire load = 1,600 lbs
Tire inflation = 60psi
For tire # 2 of 4:
Tire size = ST225/75-R15 load range E
Tire load = 1,800 lbs
Tire inflation = 60psi
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Let's do some more math.
An ST225/75R16 inflated to 60 psi has a load carrying capacity of 2380#.
I like a tire not operate at more than 85% of its rated load, so my recommendation would be not to load the tire more than 2023#.
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03-06-2015, 05:59 AM
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#63
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Rivet Master
Vintage Kin Owner
Lin
, Ne
Join Date: Dec 2009
Posts: 2,430
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Quote:
Originally Posted by Tireman9
OK I accept the challenge. You give me a specific question with all the relevant facts and I will offer my opinion.
It may help if I knew your profession so I can understand your view on product quality and reliability.
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I've spent yrs welding pipeline and in a few nuclear power plants. I'm a Virgo so I'm inherently a perfectionist.
__________________
The higher your expectations the fewer your options.
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03-06-2015, 06:09 AM
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#64
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Rivet Master
Vintage Kin Owner
Lin
, Ne
Join Date: Dec 2009
Posts: 2,430
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Quote:
Originally Posted by Tireman9
Lets try a different approach to see if we can help you understand what is meant by under inflated.
" Under inflated" means less air pressure than is needed to carry the load.
.
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Who's (we) and I've read a post from one of the 2 experts here in the past that said less than 80% of the sidewall max pressure is a tire under inflated.
__________________
The higher your expectations the fewer your options.
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03-06-2015, 06:15 AM
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#65
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Rivet Master
Vintage Kin Owner
Lin
, Ne
Join Date: Dec 2009
Posts: 2,430
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Quote:
Originally Posted by J. Morgan
Who here disagrees that a tire with internal damage resulting from being driven under inflated usually always displays external evidence of this damage via bulges, lumps, uneven sidewalls, or knots on the sidewall or tread area?
In short, the damage to the interior of a tire USUALLY becomes visible on the exterior.
The application of common sense sense goes a long way.
I can't remember the last time I was stuck on the side of the road with a failed tire or even a flat. Perhaps 20 years or more?
Part of this is what is called "luck", but part of this is paying attention to my tires.
1/2 Ton 4WD Truck, 72 Sovereign Hensley Arrow
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Maybe tires nowadays are considered damaged if you let the air out and refill them while they are still on the vehicle.
__________________
The higher your expectations the fewer your options.
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03-06-2015, 10:33 AM
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#66
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Rivet Master
Commercial Member
Ravenna
, Ohio
Join Date: Apr 2012
Posts: 1,344
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Quote:
Originally Posted by r carl
Who's (we) and I've read a post from one of the 2 experts here in the past that said less than 80% of the sidewall max pressure is a tire under inflated.
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Can't speak for Capri but If you can point to where I said that running 20% less than the tire max load as molded on the sidewall was considered "flat" for warranty purposes, I will go and correct that statement.
I have seen statements from tire companies to the point of defining a tire as "flat" when it has lost more than 20% of its air. I interpret this to mean the air pressure needed to carry the actual load on the tire.
__________________
Retired tire engineer (50 years). Write a blog on RV Tire Safety Net. Give seminars for FMCA across the US. Tucson AZ in Mar 2024 is next.
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03-06-2015, 10:37 AM
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#67
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Rivet Master
Commercial Member
Ravenna
, Ohio
Join Date: Apr 2012
Posts: 1,344
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Quote:
Originally Posted by r carl
I've spent yrs welding pipeline and in a few nuclear power plants. I'm a Virgo so I'm inherently a perfectionist.
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Cool.
Could you tel me the correct Amp setting when welding 6" diameter Schedule 80 pipe?
The answer needs to be in the form of...
"The correct setting to weld 6"diameter Schedule 80 pipe is xxx Amps."
Remember no wishy washy answers such as "Sometimes..." or "If you are welding using.....". etc.
__________________
Retired tire engineer (50 years). Write a blog on RV Tire Safety Net. Give seminars for FMCA across the US. Tucson AZ in Mar 2024 is next.
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03-06-2015, 12:00 PM
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#68
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Always learning
1972 29' Ambassador
1962 19' Globetrotter
1951 21' Flying Cloud
Central
, Texas
Join Date: Oct 2010
Posts: 2,881
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Repaired tires
I now have two repaired tires on my 2014 RAM 1500. They were repaired at Discount Tire. I was alerted to the first tire going flat by the TPMS as I was turning the corner into my shop. It was a nail in the right front. The second, also on the right front after tire rotation, I heard the leak because it was wet. This time it was a flat head drive bit. The TPMS gives me confidence these tires will last until I change them because I know they weren't run under inflated.
A week ago I purchased the "certificates" from Discount Tire to cover non repairable damage. Since all the houses around here are getting new shingles from last spring's hail storm there seems to be a lot of tire punctures.
__________________
Lance
Work is never done, so take time to play!
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03-06-2015, 12:21 PM
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#69
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Rivet Master
Vintage Kin Owner
Lin
, Ne
Join Date: Dec 2009
Posts: 2,430
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Quote:
Originally Posted by Tireman9
Cool.
Could you tel me the correct Amp setting when welding 6" diameter Schedule 80 pipe?
The answer needs to be in the form of...
"The correct setting to weld 6"diameter Schedule 80 pipe is xxx Amps."
Remember no wishy washy answers such as "Sometimes..." or "If you are welding using.....". etc.
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The type and size of rod will determine that.
1/8 7018 will be around DC 115amps
I use a Lincoln SA200 so I don't know the amps.
__________________
The higher your expectations the fewer your options.
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03-06-2015, 12:34 PM
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#70
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Rivet Master
2000 25' Safari
Davidson County
, NC Highlands County, FL
Join Date: Aug 2006
Posts: 4,493
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Quote:
Originally Posted by CapriRacer
Let's do some more math.
An ST225/75R16 inflated to 60 psi has a load carrying capacity of 2380#.
I like a tire not operate at more than 85% of its rated load, so my recommendation would be not to load the tire more than 2023#.
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Thanks for all of the information you provide!
After 3+ years of owning these tires, I sent another (2nd or 3rd) request for a load/inflation chart to the Towmax customer service dept. I finally got it today!
The number you gave me was exactly what the chart says. According to this chart, I could lower the pressure in my trailer's tires to ~36-37 lbs before they would be underinflated. (assuming 100% of the published load capacity is underinflated, the point at which the pressure does not support the load) That's good to know!
Another thing I learned: The manufacturer's data plate on my Safari says to inflate to 50 PSI. The chart says that pressure in my tires will support 2,150 lbs at 50 PSI. Using the 85% rule that you suggested indicates the tires should be good up to 1,827 lbs at 50 PSI suggested by Airstream, a perfect match.
Though, I will continue to inflate to 60 PSI to have that extra capacity.
Thank you for the clarifications!
__________________
Alan
2014 Silverado LTZ 1500 Crew Cab 5.3L maximum trailering package
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