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tech / rec.aviation.soaring / Re: Trailer tires, what to buy?

SubjectAuthor
* Trailer tires, what to buy?Chris Behm
+* Re: Trailer tires, what to buy?2G
|+* Re: Trailer tires, what to buy?Dave Nadler
||`- Re: Trailer tires, what to buy?2G
|+* Re: Trailer tires, what to buy?Mark Mocho
||`* Re: Trailer tires, what to buy?Anders Black
|| `* Re: Trailer tires, what to buy?Eric Greenwell
||  `* Re: Trailer tires, what to buy?2G
||   +- Re: Trailer tires, what to buy?Guy Acheson
||   `- Re: Trailer tires, what to buy?Eric Greenwell
|`* Re: Trailer tires, what to buy?Herbert Kilian
| +- Re: Trailer tires, what to buy?Nicholas Kennedy
| `* Re: Trailer tires, what to buy?2G
|  `* Re: Trailer tires, what to buy?Mark Mocho
|   `- Re: Trailer tires, what to buy?Ron Gleason
+* Re: Trailer tires, what to buy?AS
|`* Re: Trailer tires, what to buy?Guy Acheson
| `* Re: Trailer tires, what to buy?Charlie M. (UH & 002 owner/pilot)
|  `* Re: Trailer tires, what to buy?Eric Greenwell
|   +* Re: Trailer tires, what to buy?2G
|   |+- Re: Trailer tires, what to buy?Mike the Strike
|   |`* Re: Trailer tires, what to buy?Eric Greenwell
|   | `- Re: Trailer tires, what to buy?Dee
|   `* Re: Trailer tires, what to buy?SF
|    `* Re: Trailer tires, what to buy?2G
|     `* Re: Trailer tires, what to buy?Kevin Finke
|      +- Re: Trailer tires, what to buy?2G
|      `* Re: Trailer tires, what to buy?Eric Greenwell
|       `- Re: Trailer tires, what to buy?Guy Acheson
`* Re: Trailer tires, what to buy?Papa3
 `- Re: Trailer tires, what to buy?Dan

Pages:12
Trailer tires, what to buy?

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Subject: Trailer tires, what to buy?
From: cbb...@sbcglobal.net (Chris Behm)
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 by: Chris Behm - Sun, 8 May 2022 17:30 UTC

Looks like the plane I intend to buy will need new trailer tires.
It's a Cobra trailer and the tires are size 175/80R13.
What are the latest trends and suggestions?

Light truck tires vs trailer tires, pro's and con's?

Going up a width or two in size, pro's and con's?

Thanks.

Target

Re: Trailer tires, what to buy?

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Subject: Re: Trailer tires, what to buy?
From: soar2mor...@yahoo.com (2G)
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 by: 2G - Sun, 8 May 2022 18:06 UTC

On Sunday, May 8, 2022 at 10:30:43 AM UTC-7, Chris Behm wrote:
> Looks like the plane I intend to buy will need new trailer tires.
> It's a Cobra trailer and the tires are size 175/80R13.
> What are the latest trends and suggestions?
>
> Light truck tires vs trailer tires, pro's and con's?
>
> Going up a width or two in size, pro's and con's?
>
> Thanks.
>
> Target

Good luck on finding a light truck tire that will fit a Cobra. I got a trailer tire from Les Schwab after the wife blew out one of the tires driving the trailer over a curb (it is now the spare).

Tom

Re: Trailer tires, what to buy?

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From: drn...@nadler.com (Dave Nadler)
Newsgroups: rec.aviation.soaring
Subject: Re: Trailer tires, what to buy?
Date: Sun, 8 May 2022 15:05:20 -0400
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 by: Dave Nadler - Sun, 8 May 2022 19:05 UTC

On 5/8/2022 2:06 PM, 2G wrote:
> ...I got a trailer tire from Les Schwab after the wife blew out one of the tires
> driving the trailer over a curb (it is now the spare).

Has she now trained you not to ask her to drive the trailer?
Or further lessons required???

Re: Trailer tires, what to buy?

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Subject: Re: Trailer tires, what to buy?
From: markmoch...@gmail.com (Mark Mocho)
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 by: Mark Mocho - Sun, 8 May 2022 19:06 UTC

I suggest etrailer.com for the best selection, price and delivery. Can't give any advice on what to buy, as far as size and composition. My trailer probably hasn't moved five miles in the last five years, but the tires are two years old just in case I get wanderlust.

Bob Carlton, who used to tow his Salto or other airshow gliders upwards of 40,000 miles per year insisted on using properly sized radial car tires as opposed to S/T "trailer" tires.

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Subject: Re: Trailer tires, what to buy?
From: andersbl...@gmail.com (Anders Black)
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 by: Anders Black - Sun, 8 May 2022 19:45 UTC

Apparently, trailer tires are pretty different from car or truck tires - FWIW.

https://trailervalet.com/what-is-the-difference-between-trailer-tires-vs-regular-car-tires/

Andy Blackburn
9B

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Subject: Re: Trailer tires, what to buy?
From: ulineum...@aol.com (AS)
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 by: AS - Sun, 8 May 2022 22:55 UTC

On Sunday, May 8, 2022 at 1:30:43 PM UTC-4, Chris Behm wrote:
> Looks like the plane I intend to buy will need new trailer tires.
> It's a Cobra trailer and the tires are size 175/80R13.
> What are the latest trends and suggestions?
>
> Light truck tires vs trailer tires, pro's and con's?
>
> Going up a width or two in size, pro's and con's?
>
> Thanks.
>
> Target

I posted the same question with my friends in Germany and their resounding response was to stick with the OEM-type tires. The OEM tires on my Cobra trailer had no indication that they were anything but regular car tires.
I had a blow-out last year after hitting one too many potholes in the Memphis, TN area. Fortunately, this was a non-event because my trailer has twin-axles. I replaced all tires with the same size and type but I picked the ones with a highest load rating I could find, which gives one a little extra margin. If memory serves me right, the OEM tires had a Load Index of 81 (1,019#) and I picked one with 88 (1,235#).

Uli
'AS'

Re: Trailer tires, what to buy?

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Subject: Re: Trailer tires, what to buy?
From: drguyach...@gmail.com (Guy Acheson)
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 by: Guy Acheson - Mon, 9 May 2022 02:57 UTC

America's Tire and Discount Tire have trailer tires for your rig.
For 13 inch wheels it may take a couple of days to get them in the store.
I find "trailer tires" have stiffer sidewalls and don't sway as much as automobile tires.
I also buy new tires every five years. Tires rot.
Learn to read the manufacturing date that is on every tire.

Re: Trailer tires, what to buy?

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From: own...@thegreenwells.netto (Eric Greenwell)
Newsgroups: rec.aviation.soaring
Subject: Re: Trailer tires, what to buy?
Date: Mon, 9 May 2022 06:53:09 -0700
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 by: Eric Greenwell - Mon, 9 May 2022 13:53 UTC

On 5/8/2022 12:45 PM, Anders Black wrote:
> Apparently, trailer tires are pretty different from car or truck tires - FWIW.
>
> https://trailervalet.com/what-is-the-difference-between-trailer-tires-vs-regular-car-tires/
>
> Andy Blackburn
> 9B

This article contains substantial misstatements.

"Bias ply trailer tires have a shorter tread life, but are built with a different
construction method intended for heavier loads." Wrong: The tire rating tells you how much
load a tire is intended to handle, NOT the construction.

"While LT tires may have thicker sidewalls and seem to make sense as an option, they still
are not designed to respond to trailer specific issues." Wrong: LT tires have a much
higher speed rating than ST tires (20 to 30 mph higher), and can easily handle trailering
side and braking loads.

"The load bearing capacity listed on an LT tire is designed based on the frame of a truck
– not the frame of a trailer. Wrong: the ratings are not based on the frame design, which
is not standardized for trailers or trucks. Trailers and light trucks do often have the
same solid axle design, which seems more relevant than the frame to which the axle springs
are attached. Also, Cobra trailers have an independent axle for each wheel, yet there is
no requirement to use a different tire.

Not mentioned in the article:

- ST tires generally have a 65-70 mph speed limit with the standard inflation pressures,
but can go a bit higher with higher pressures

- Bias ply ST tires have only one advantage over radial ST tires: they are cheaper.

--
Eric Greenwell - USA
- "A Guide to Self-launching Sailplane Operation"
https://sites.google.com/site/motorgliders/publications

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Date: Mon, 9 May 2022 08:11:36 -0700 (PDT)
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Subject: Re: Trailer tires, what to buy?
From: soar2mor...@yahoo.com (2G)
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 by: 2G - Mon, 9 May 2022 15:11 UTC

On Sunday, May 8, 2022 at 12:05:27 PM UTC-7, d...@nadler.com wrote:
> On 5/8/2022 2:06 PM, 2G wrote:
> > ...I got a trailer tire from Les Schwab after the wife blew out one of the tires
> > driving the trailer over a curb (it is now the spare).
> Has she now trained you not to ask her to drive the trailer?
> Or further lessons required???

I taught her how to pull a trailer, but she forgot most of it. Basically, a trailer tracks inside of the vehicle's track while turning and there was a curb that she pulled the trailer over too fast. We had another driving lesson after this.

BTW, we caravan pulling two trailers; I pull the travel trailer.

Tom

Re: Trailer tires, what to buy?

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Subject: Re: Trailer tires, what to buy?
From: erik.h.m...@gmail.com (Papa3)
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 by: Papa3 - Mon, 9 May 2022 15:44 UTC

Just did this last weekend with my 2013 Cobra. Mine had OEM tires from Cobra which were Dunlop auto tires 175/70/R14. My tire guy couldn't get the exact same Dunlops (they were one of their middle-of-the-range Sport models) and we replaced with the same spec tires from General. Drove them back to the gliderport at 65-70 mph and couldn't tell any difference from the originals.

P3

On Sunday, May 8, 2022 at 1:30:43 PM UTC-4, Chris Behm wrote:
> Looks like the plane I intend to buy will need new trailer tires.
> It's a Cobra trailer and the tires are size 175/80R13.
> What are the latest trends and suggestions?
>
> Light truck tires vs trailer tires, pro's and con's?
>
> Going up a width or two in size, pro's and con's?
>
> Thanks.
>
> Target

Re: Trailer tires, what to buy?

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Subject: Re: Trailer tires, what to buy?
From: danr...@aol.com (Dan)
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 by: Dan - Mon, 9 May 2022 15:57 UTC

On Monday, May 9, 2022 at 8:44:54 AM UTC-7, Papa3 wrote:
> Just did this last weekend with my 2013 Cobra. Mine had OEM tires from Cobra which were Dunlop auto tires 175/70/R14. My tire guy couldn't get the exact same Dunlops (they were one of their middle-of-the-range Sport models) and we replaced with the same spec tires from General. Drove them back to the gliderport at 65-70 mph and couldn't tell any difference from the originals.
>
> P3
> On Sunday, May 8, 2022 at 1:30:43 PM UTC-4, Chris Behm wrote:
> > Looks like the plane I intend to buy will need new trailer tires.
> > It's a Cobra trailer and the tires are size 175/80R13.
> > What are the latest trends and suggestions?
> >
> > Light truck tires vs trailer tires, pro's and con's?
> >
> > Going up a width or two in size, pro's and con's?
> >
> > Thanks.
> >
> > Target
I recently bought these tires for my Cobra Trailer-
Goodyear Endurance st205/75r14
These are made for trailers and I noticed that the trailer tows much better than the original tires installed by Cobra
There is a lot of info on them on the internet- Google them

Dan Rihn

Re: Trailer tires, what to buy?

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Subject: Re: Trailer tires, what to buy?
From: soar2mor...@yahoo.com (2G)
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 by: 2G - Tue, 10 May 2022 00:38 UTC

On Monday, May 9, 2022 at 6:53:12 AM UTC-7, Eric Greenwell wrote:
> On 5/8/2022 12:45 PM, Anders Black wrote:
> > Apparently, trailer tires are pretty different from car or truck tires - FWIW.
> >
> > https://trailervalet.com/what-is-the-difference-between-trailer-tires-vs-regular-car-tires/
> >
> > Andy Blackburn
> > 9B
> This article contains substantial misstatements.
>
> "Bias ply trailer tires have a shorter tread life, but are built with a different
> construction method intended for heavier loads." Wrong: The tire rating tells you how much
> load a tire is intended to handle, NOT the construction.
>
> "While LT tires may have thicker sidewalls and seem to make sense as an option, they still
> are not designed to respond to trailer specific issues." Wrong: LT tires have a much
> higher speed rating than ST tires (20 to 30 mph higher), and can easily handle trailering
> side and braking loads.
>
> "The load bearing capacity listed on an LT tire is designed based on the frame of a truck
> – not the frame of a trailer. Wrong: the ratings are not based on the frame design, which
> is not standardized for trailers or trucks. Trailers and light trucks do often have the
> same solid axle design, which seems more relevant than the frame to which the axle springs
> are attached. Also, Cobra trailers have an independent axle for each wheel, yet there is
> no requirement to use a different tire.
>
> Not mentioned in the article:
>
> - ST tires generally have a 65-70 mph speed limit with the standard inflation pressures,
> but can go a bit higher with higher pressures
>
> - Bias ply ST tires have only one advantage over radial ST tires: they are cheaper.
>
> --
> Eric Greenwell - USA
> - "A Guide to Self-launching Sailplane Operation"
> https://sites.google.com/site/motorgliders/publications

You never mentioned where you can buy LT tires that will fit a Cobra trailer.

Tom

Re: Trailer tires, what to buy?

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Subject: Re: Trailer tires, what to buy?
From: charlied...@gmail.com (Charlie M. (UH & 002 owner/pilot))
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 by: Charlie M. (UH & - Tue, 10 May 2022 01:19 UTC

On Sunday, May 8, 2022 at 10:57:24 PM UTC-4, Guy Acheson wrote:
> America's Tire and Discount Tire have trailer tires for your rig.
> For 13 inch wheels it may take a couple of days to get them in the store.
> I find "trailer tires" have stiffer sidewalls and don't sway as much as automobile tires.
> I also buy new tires every five years. Tires rot.
> Learn to read the manufacturing date that is on every tire.
A tire can't be sold as new if it was molded more than 3 years ago.
Most trailer tires rot before wearing out. It seems like 5-7 years is about it for a "safe tire" before rot/cracks.
The date code is on one sidewall, it's molded in a oval about 1" long by 1/2" tall and close to the rim. It's 4 digits....the first 2 digits are the week of the year, the second 2 digits are last 2 digits of the year. So a code of "2321" is 23rd week of 2021.

Just a tidbit. ;-)

Re: Trailer tires, what to buy?

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Subject: Re: Trailer tires, what to buy?
From: drguyach...@gmail.com (Guy Acheson)
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 by: Guy Acheson - Tue, 10 May 2022 01:46 UTC

See my post of 8 May.
America's Tire and Discount Tire can get you trailer tires for 13/14/15 inch wheels.

Re: Trailer tires, what to buy?

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Newsgroups: rec.aviation.soaring
Subject: Re: Trailer tires, what to buy?
Date: Mon, 9 May 2022 19:54:21 -0700
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 by: Eric Greenwell - Tue, 10 May 2022 02:54 UTC

On 5/9/2022 5:38 PM, 2G wrote:
> On Monday, May 9, 2022 at 6:53:12 AM UTC-7, Eric Greenwell wrote:
>> On 5/8/2022 12:45 PM, Anders Black wrote:
>>> Apparently, trailer tires are pretty different from car or truck tires - FWIW.
>>>
>>> https://trailervalet.com/what-is-the-difference-between-trailer-tires-vs-regular-car-tires/
>>>
>>> Andy Blackburn
>>> 9B
>> This article contains substantial misstatements.
>>
>> "Bias ply trailer tires have a shorter tread life, but are built with a different
>> construction method intended for heavier loads." Wrong: The tire rating tells you how much
>> load a tire is intended to handle, NOT the construction.
>>
>> "While LT tires may have thicker sidewalls and seem to make sense as an option, they still
>> are not designed to respond to trailer specific issues." Wrong: LT tires have a much
>> higher speed rating than ST tires (20 to 30 mph higher), and can easily handle trailering
>> side and braking loads.
>>
>> "The load bearing capacity listed on an LT tire is designed based on the frame of a truck
>> – not the frame of a trailer. Wrong: the ratings are not based on the frame design, which
>> is not standardized for trailers or trucks. Trailers and light trucks do often have the
>> same solid axle design, which seems more relevant than the frame to which the axle springs
>> are attached. Also, Cobra trailers have an independent axle for each wheel, yet there is
>> no requirement to use a different tire.
>>
>> Not mentioned in the article:
>>
>> - ST tires generally have a 65-70 mph speed limit with the standard inflation pressures,
>> but can go a bit higher with higher pressures
>>
>> - Bias ply ST tires have only one advantage over radial ST tires: they are cheaper.
>>
>> --
>> Eric Greenwell - USA
>> - "A Guide to Self-launching Sailplane Operation"
>> https://sites.google.com/site/motorgliders/publications
>
> You never mentioned where you can buy LT tires that will fit a Cobra trailer.
>
> Tom

I know I've told you before, and (I think) also RAS: tirerack.com.

https://www.tirerack.com/tires/tires.jsp?tireMake=Yokohama&tireModel=Y356&partnum=8R43568

--
Eric Greenwell - USA
- "A Guide to Self-launching Sailplane Operation"
https://sites.google.com/site/motorgliders/publications

Re: Trailer tires, what to buy?

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From: own...@thegreenwells.netto (Eric Greenwell)
Newsgroups: rec.aviation.soaring
Subject: Re: Trailer tires, what to buy?
Date: Mon, 9 May 2022 19:59:47 -0700
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 by: Eric Greenwell - Tue, 10 May 2022 02:59 UTC

On 5/9/2022 6:19 PM, Charlie M. (UH & 002 owner/pilot) wrote:
> On Sunday, May 8, 2022 at 10:57:24 PM UTC-4, Guy Acheson wrote:
>> America's Tire and Discount Tire have trailer tires for your rig.
>> For 13 inch wheels it may take a couple of days to get them in the store.
>> I find "trailer tires" have stiffer sidewalls and don't sway as much as automobile tires.
>> I also buy new tires every five years. Tires rot.
>> Learn to read the manufacturing date that is on every tire.
> A tire can't be sold as new if it was molded more than 3 years ago.
> Most trailer tires rot before wearing out. It seems like 5-7 years is about it for a "safe tire" before rot/cracks.
> The date code is on one sidewall, it's molded in a oval about 1" long by 1/2" tall and close to the rim. It's 4 digits....the first 2 digits are the week of the year, the second 2 digits are last 2 digits of the year. So a code of "2321" is 23rd week of 2021.
>
> Just a tidbit. ;-)

I've always wondered what "tire rot" was. Is that a technical term? If so, what is the
specific meaning?

Michelin recommends 10 years as a replacement age limit on their tires. I don't know what
other manufacturers recommend.

https://www.michelinman.com/auto/auto-tips-and-advice/tire-buying-guide/when-do-i-need-new-tires

--
Eric Greenwell - USA
- "A Guide to Self-launching Sailplane Operation"
https://sites.google.com/site/motorgliders/publications

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Subject: Re: Trailer tires, what to buy?
From: soar2mor...@yahoo.com (2G)
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 by: 2G - Tue, 10 May 2022 04:18 UTC

On Monday, May 9, 2022 at 7:59:53 PM UTC-7, Eric Greenwell wrote:
> On 5/9/2022 6:19 PM, Charlie M. (UH & 002 owner/pilot) wrote:
> > On Sunday, May 8, 2022 at 10:57:24 PM UTC-4, Guy Acheson wrote:
> >> America's Tire and Discount Tire have trailer tires for your rig.
> >> For 13 inch wheels it may take a couple of days to get them in the store.
> >> I find "trailer tires" have stiffer sidewalls and don't sway as much as automobile tires.
> >> I also buy new tires every five years. Tires rot.
> >> Learn to read the manufacturing date that is on every tire.
> > A tire can't be sold as new if it was molded more than 3 years ago.
> > Most trailer tires rot before wearing out. It seems like 5-7 years is about it for a "safe tire" before rot/cracks.
> > The date code is on one sidewall, it's molded in a oval about 1" long by 1/2" tall and close to the rim. It's 4 digits....the first 2 digits are the week of the year, the second 2 digits are last 2 digits of the year. So a code of "2321" is 23rd week of 2021.
> >
> > Just a tidbit. ;-)
> I've always wondered what "tire rot" was. Is that a technical term? If so, what is the
> specific meaning?
>
> Michelin recommends 10 years as a replacement age limit on their tires. I don't know what
> other manufacturers recommend.
>
> https://www.michelinman.com/auto/auto-tips-and-advice/tire-buying-guide/when-do-i-need-new-tires
> --
> Eric Greenwell - USA
> - "A Guide to Self-launching Sailplane Operation"
> https://sites.google.com/site/motorgliders/publications

Tire rot is the oxidation of the rubber while exposed to air. Since the air in the tire is compressed oxidation occurs faster from the inside than the outside.

Re: Trailer tires, what to buy?

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Subject: Re: Trailer tires, what to buy?
From: Stringm...@msn.com (Mike the Strike)
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 by: Mike the Strike - Tue, 10 May 2022 05:43 UTC

On Tuesday, May 10, 2022 at 5:18:27 AM UTC+1, 2G wrote:
> On Monday, May 9, 2022 at 7:59:53 PM UTC-7, Eric Greenwell wrote:
> > On 5/9/2022 6:19 PM, Charlie M. (UH & 002 owner/pilot) wrote:
> > > On Sunday, May 8, 2022 at 10:57:24 PM UTC-4, Guy Acheson wrote:
> > >> America's Tire and Discount Tire have trailer tires for your rig.
> > >> For 13 inch wheels it may take a couple of days to get them in the store.
> > >> I find "trailer tires" have stiffer sidewalls and don't sway as much as automobile tires.
> > >> I also buy new tires every five years. Tires rot.
> > >> Learn to read the manufacturing date that is on every tire.
> > > A tire can't be sold as new if it was molded more than 3 years ago.
> > > Most trailer tires rot before wearing out. It seems like 5-7 years is about it for a "safe tire" before rot/cracks.
> > > The date code is on one sidewall, it's molded in a oval about 1" long by 1/2" tall and close to the rim. It's 4 digits....the first 2 digits are the week of the year, the second 2 digits are last 2 digits of the year. So a code of "2321" is 23rd week of 2021.
> > >
> > > Just a tidbit. ;-)
> > I've always wondered what "tire rot" was. Is that a technical term? If so, what is the
> > specific meaning?
> >
> > Michelin recommends 10 years as a replacement age limit on their tires. I don't know what
> > other manufacturers recommend.
> >
> > https://www.michelinman.com/auto/auto-tips-and-advice/tire-buying-guide/when-do-i-need-new-tires
> > --
> > Eric Greenwell - USA
> > - "A Guide to Self-launching Sailplane Operation"
> > https://sites.google.com/site/motorgliders/publications
> Tire rot is the oxidation of the rubber while exposed to air. Since the air in the tire is compressed oxidation occurs faster from the inside than the outside.
I have had the best success with tires designed for trailer use - I believe this is due to the sidewall construction, since trailer tires aren't typically steered or driven like car or truck tires. Discount tire has always found me something suitable.

Some years ago, a tire on my Cobra trailer disintegrated on my way from Tucson to Moriarty. Apparently, 200 miles at 75 mph proved too much for the cheap Chinese tire, and it flew apart spectacularly! In Arizona, you are lucky to get 5 years out of tires, due to heat and UV exposure - even if they look fine.

Mike

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From: own...@thegreenwells.netto (Eric Greenwell)
Newsgroups: rec.aviation.soaring
Subject: Re: Trailer tires, what to buy?
Date: Tue, 10 May 2022 05:48:37 -0700
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 by: Eric Greenwell - Tue, 10 May 2022 12:48 UTC

On 5/9/2022 9:18 PM, 2G wrote:
> On Monday, May 9, 2022 at 7:59:53 PM UTC-7, Eric Greenwell wrote:
>> On 5/9/2022 6:19 PM, Charlie M. (UH & 002 owner/pilot) wrote:
>>> On Sunday, May 8, 2022 at 10:57:24 PM UTC-4, Guy Acheson wrote:
>>>> America's Tire and Discount Tire have trailer tires for your rig.
>>>> For 13 inch wheels it may take a couple of days to get them in the store.
>>>> I find "trailer tires" have stiffer sidewalls and don't sway as much as automobile tires.
>>>> I also buy new tires every five years. Tires rot.
>>>> Learn to read the manufacturing date that is on every tire.
>>> A tire can't be sold as new if it was molded more than 3 years ago.
>>> Most trailer tires rot before wearing out. It seems like 5-7 years is about it for a "safe tire" before rot/cracks.
>>> The date code is on one sidewall, it's molded in a oval about 1" long by 1/2" tall and close to the rim. It's 4 digits....the first 2 digits are the week of the year, the second 2 digits are last 2 digits of the year. So a code of "2321" is 23rd week of 2021.
>>>
>>> Just a tidbit. ;-)
>> I've always wondered what "tire rot" was. Is that a technical term? If so, what is the
>> specific meaning?
>>
>> Michelin recommends 10 years as a replacement age limit on their tires. I don't know what
>> other manufacturers recommend.
>>
>> https://www.michelinman.com/auto/auto-tips-and-advice/tire-buying-guide/when-do-i-need-new-tires
>> --
>> Eric Greenwell - USA
>> - "A Guide to Self-launching Sailplane Operation"
>> https://sites.google.com/site/motorgliders/publications
>
> Tire rot is the oxidation of the rubber while exposed to air. Since the air in the tire is compressed oxidation occurs faster from the inside than the outside.

I stumbled upon this page by Goodyear, which says "Tire Dry Rot, aka Sidewall Weathering,
is visible cracking in a tire’s tread or sidewall caused when a tire’s rubber compounds
break down."

https://www.goodyear.com/en-US/learn/tire-care-maintenance/dry-rot-tires

It doesn't comment about the air inside the tire, or using nitrogen to reduce the rot,
even on the page that discusses using nitrogen.

https://www.goodyear.com/en-US/learn/tire-care-maintenance/nitrogen-in-tires

--
Eric Greenwell - USA
- "A Guide to Self-launching Sailplane Operation"
https://sites.google.com/site/motorgliders/publications

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Subject: Re: Trailer tires, what to buy?
From: phlying...@gmail.com (Dee)
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 by: Dee - Tue, 10 May 2022 15:24 UTC

This is an expansive article on the wear issue. Even explains why tire aging is worse if they sit idle vs. road use. Google search is an amazing tool; this one took about 8 seconds.\

https://www.liveabout.com/the-science-of-tire-aging-3234377#

Phyllis

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Subject: Re: Trailer tires, what to buy?
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 by: SF - Tue, 10 May 2022 21:04 UTC

Eric,
John Murray did a very scientific study based on his sales of replacement Cobra trailer fenders, and asking questions as to how old the tires responsible were at the time of the incident. And if I remember correctly his data indicated that tires less than 5 years old did not tend to destroy trailer fenders on their way to wherever dead tires go when they die. There might be some sarcasm in the scientific claim in my first sentence, however that bar has been lowered significantly as of late, so maybe not. Replace every 4-5 years, car radials are fine is what I remember. Load and speed ratings Mo is Betta, considering how I drive. Other studies on truck fleet tires indicate Nitrogen fill significantly increases tire life. But sadly the nitrogen fill station is never where you need it to be, when the tires look a little slack. Given the price of the tires, and the price of the problems they could cause whilst trailering in the nether regions of bumfuckistan where the flying is good, and the repair shops are 2-weeks distant, a 4-5 year replacement schedule seems cheap.
SF

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Subject: Re: Trailer tires, what to buy?
From: soar2mor...@yahoo.com (2G)
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 by: 2G - Wed, 11 May 2022 01:20 UTC

On Tuesday, May 10, 2022 at 2:04:45 PM UTC-7, SF wrote:
> Eric,
> John Murray did a very scientific study based on his sales of replacement Cobra trailer fenders, and asking questions as to how old the tires responsible were at the time of the incident. And if I remember correctly his data indicated that tires less than 5 years old did not tend to destroy trailer fenders on their way to wherever dead tires go when they die. There might be some sarcasm in the scientific claim in my first sentence, however that bar has been lowered significantly as of late, so maybe not. Replace every 4-5 years, car radials are fine is what I remember. Load and speed ratings Mo is Betta, considering how I drive. Other studies on truck fleet tires indicate Nitrogen fill significantly increases tire life. But sadly the nitrogen fill station is never where you need it to be, when the tires look a little slack. Given the price of the tires, and the price of the problems they could cause whilst trailering in the nether regions of bumfuckistan where the flying is good, and the repair shops are 2-weeks distant, a 4-5 year replacement schedule seems cheap.
> SF

Atmospheric pressure is about 14 psi, your tires are inflated to 40 psi or more (3x). It makes sense that there are a lot more oxygen atoms available to oxidize the rubber from inside the tire than outside. UV from the Sun is also a factor, which can be mitigated with tire covers. Filling with nitrogen solves this problem, as well as not changing in pressure much as the tire heats, but finding tire shops with nitrogen is problematic.
Tom

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Subject: Re: Trailer tires, what to buy?
From: fink0...@gmail.com (Kevin Finke)
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 by: Kevin Finke - Wed, 11 May 2022 02:52 UTC

I've never understood the claim that nitrogen filled tires won't change the pressures with temperature as much as Air filled tires. Ideal gas law states that the relationship between Delta P, pressure change, is wholly a function of delta T, temperature change. There's no constant multiplier for different types of gas. Air, pure Oxygen, pure Nitrogen all behave like ideal gasses.

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Subject: Re: Trailer tires, what to buy?
From: soar2mor...@yahoo.com (2G)
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 by: 2G - Wed, 11 May 2022 03:10 UTC

On Tuesday, May 10, 2022 at 7:52:52 PM UTC-7, Kevin Finke wrote:
> I've never understood the claim that nitrogen filled tires won't change the pressures with temperature as much as Air filled tires. Ideal gas law states that the relationship between Delta P, pressure change, is wholly a function of delta T, temperature change. There's no constant multiplier for different types of gas. Air, pure Oxygen, pure Nitrogen all behave like ideal gasses.

You are right. This explains the benefits of nitrogen fill (not the least of which is the absence of internal oxidation):
https://www.tirerack.com/tires/tiretech/techpage.jsp?gclid=Cj0KCQjwmuiTBhDoARIsAPiv6L_S9-Dgqc4r41PHU3ZmgXYZBkDe8fvwb3lWB_sYPrT9IdSGyu9vA0MaApNIEALw_wcB&techid=191&ef_id=Cj0KCQjwmuiTBhDoARIsAPiv6L_S9-Dgqc4r41PHU3ZmgXYZBkDe8fvwb3lWB_sYPrT9IdSGyu9vA0MaApNIEALw_wcB:G:s&s_kwcid=AL!3756!3!354820920608!p!!g!!air%20vs%20nitrogen&gclsrc=aw.ds

Tom

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From: own...@thegreenwells.netto (Eric Greenwell)
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Subject: Re: Trailer tires, what to buy?
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 by: Eric Greenwell - Wed, 11 May 2022 12:53 UTC

On 5/10/2022 7:52 PM, Kevin Finke wrote:
> I've never understood the claim that nitrogen filled tires won't change the pressures with temperature as much as Air filled tires. Ideal gas law states that the relationship between Delta P, pressure change, is wholly a function of delta T, temperature change. There's no constant multiplier for different types of gas. Air, pure Oxygen, pure Nitrogen all behave like ideal gasses.
I've not seen it explained very well, but what they might be talking about is
condensation. Most tires are filled with compressed ambient air, which has some water
vapor in it, and a lot of vapor in humid areas. If the tire cools below the dew point, the
air in the tire is no longer an ideal gas, as some of the gas (water vapor) condenses. On
a SkewT diagram, it's where you switch from the dry adiabat to the wet adiabat - very
different curves.

--
Eric Greenwell - USA
- "A Guide to Self-launching Sailplane Operation"
https://sites.google.com/site/motorgliders/publications

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