Goodyear Marathon, + 10psi to run 66-75 MPH?

[AnnArborBob]

I should add that the best and safest use for GYMs is on completely stationary trailers that never move from their RV pad.

[CDONA]

^ This will age set your axles from non use. The rubber torsion bands need exercise to stay viable as a spring. Check you axle info that comes in the owners packet of warranty & use instructions.

[TheCabin]

"Goodyear doesn't know what load is placed on the tire, or what additional stresses (tandem axles, etc.) are imposed. Airstream does."

I agree that GY does not know what load is applied in an eventual application. It must be up to the application builder to determine that and then using information from the tire manufacturer determine the tire and its pressure. As far as AS knowing the stresses, I don't know how they would. They told me that they do not have dynamic models of the trailers and they do not appear to be the type of company that would go and actually measure some technical data.

[franklyfrank]

Originally Posted by AtomicNo13

The gym already comes equipped with an auto explode feature why help accellerste that function by puffing it up more and then making it spin faster?

Now that's funny

[m.hony]

Hmm...
Seems like they would just explode or separate sooner...

[Tincampers]

I wonder if AS uses the same inflation sticker on all trailers regardless of size.

[Howard L.]

Originally Posted by markdoane

You may do that, however the increase is above the reocmmended inflation pressure for your load. not above the max pressure on the sidewall.

So if your recommended inflation is 55 psi for your load, then you can go up 10 psi to 65 psi, but you cannot go above 65 psi maximun cold inflation pressure.

Mark's info above is correct. Several manufacturers allow this, Maxxis and a couple others in writing. For example, I run Maxxis "E" rated ST tires on my 30 FC. Without looking at the charts, I believe the weight of my 30 requires somewhere close to 50 psi to carry the load. I keep the 4 tires at 75 psi so, when doing 70 to 75 mph downhill, I'm not concerned.
With the LT tires that many have gone to, the speed restriction is not a factor. But they have given up sidewall strength and thus some protection against side shearing forces. Take a look at your tandem tires during a sharp backing turn. That's one reason why ST tires are recommended for twin axle trailers. However, if you want to drive fast, buy LT tires.

[n2916s]

My Marathons have about 18,000 miles on them now after 3 1/2 years. No problems of any kind. I run TPMS, keep them inflated to 65psi and rotate them front to back annually. Will age out late 2017.

I confess to never towing past 65 mph and I avoid curbs and potholes as best as I am able.

I guess I am the lucky outlier who proves the exception to the rule.

[m.hony]

2017 ain't here yet.


Sent from my iPad using Airstream Forums

[Roguegaston]

I am scratching my head over the 2017 owners manual recommendations.

'The maximum speed rating on the tires installed
on your trailer is 106 MPH. Do not exceed this
rating. Failure to heed this warning could cause
catastrophic tire failure resulting in property
damage, personal injury, and/or death."

Really? 106 MPH"

Jason

[xrvr]

Originally Posted by Howard L.

Mark's info above is correct. Several manufacturers allow this, Maxxis and a couple others in writing. For example, I run Maxxis "E" rated ST tires on my 30 FC. Without looking at the charts, I believe the weight of my 30 requires somewhere close to 50 psi to carry the load. I keep the 4 tires at 75 psi so, when doing 70 to 75 mph downhill, I'm not concerned.
With the LT tires that many have gone to, the speed restriction is not a factor. But they have given up sidewall strength and thus some protection against side shearing forces. Take a look at your tandem tires during a sharp backing turn. That's one reason why ST tires are recommended for twin axle trailers. However, if you want to drive fast, buy LT tires.

Have you personally looked at these tires during sharp turns on tandem axles.? A lot of tnis info is just being repeated from one poster who couldn't or wouldn't verify it.

[KenBrodin]

I have a copy of the statement from Tire Rack re the GYM tires. I just finished a 5000 mile trip with a 28 FC running 72 psi cold and travel speeds 65 to 80mph, I run 74 on cruise control where I can. I also monitor tire temp with a laser thermometer, TV Temps averaged 99f, trailer averaged 101 with max temp 102.8 on passenger side, but never more than 1.5 degrees above driver side.
The trip was meandering from Virginia to Texas, then Missouri and back. Ambient temp range traveling from 78 to 98 degrees.
In the mountains I travel 50 to 65 mostly, but 72-75 if hiway conditions are conducive.
I never start driving without tire check. I do not run overloaded, my trailer runs level to insure balanced load on trailer axles.
All said I will replace the GYM with Maxxis soon enough.
I have 45 years towing trailers in construction with various rigs and loads, tires play a role, but loading responsibly is the greatest safeguard against disaster.
It is largely immaterial, but I also own and operate a tire store.

[xrvr]

Wow!

[Larry C]

Originally Posted by AtomicNo13

The gym already comes equipped with an auto explode feature why help accellerste that function by puffing it up more and then making it spin faster?

Good post, Will.....another thought on this would be if he would inflate the GYM''s to 115 psi, and if he has a Ford F-150, equipped with either a Hensley or PP hitch, he should be able to safely tow at somewhere around 105 to 115 mph...(am I being sarcastic er whut)

For whatever it's worth,

Larry

[J Ingersoll]

I'm planning to purchase 4 Maxxis 15" tires but I only see D rating. Are the E rated only available in 16"?

[markdoane]

Yes 15" Maxxis are available in E rating. Good for over 2800# at 80 psi.

[Howard L.]

Originally Posted by avionstream

Have you personally looked at these tires during sharp turns on tandem axles.? A lot of tnis info is just being repeated from one poster who couldn't or wouldn't verify it.

I have no idea what you are trying to say there Avion. Not sure why you would think I would say ". Take a look at your tandem tires during a sharp backing turn. ". and not have done so myself. But listen, you don't have to believe any statement posted here. Why don't you set up a sharp backup turn, get out and check for yourself.

[Mrjkq]

Originally Posted by J Ingersoll

I'm planning to purchase 4 Maxxis 15" tires but I only see D rating. Are the E rated only available in 16"?

My AS is an 11 months old (2016) 25ft model. We are currently on a X country trip having left Fl on 5/14 heading to Buffalo, NY then onto California, currently in Las Vegas. I'm running on Maxxis E rated (10 ply) tires inflated to 75psi & filled with nitrogen. So far I'm extremely satisfied with these tires after 5000 miles of all kinds of temperatures, all kinds of highway conditions & just plain hard use. There has been no variation or loss of pressure & seem to be running reasonably cool to the touch as I check at every stop.
I stand by my previous comment that over inflating GYM tires is just plain stupid & totally agree with some of the above comments regarding what Goodyear says vs what AS says regarding inflation as most double axel trailers regardless of size & weight have 225/75 15 R GYM Tires, so what Airstream puts on that sticker for each individual trailer should be considered gospel if your using GYM tires.

[Action]

Originally Posted by n2916s

My Marathons have about 18,000 miles on them now after 3 1/2 years. No problems of any kind. I run TPMS, keep them inflated to 65psi and rotate them front to back annually. Will age out late 2017.

I confess to never towing past 65 mph and I avoid curbs and potholes as best as I am able.

I guess I am the lucky outlier who proves the exception to the rule.

With prudent care and use most tires will do the job and handle the load they were designed for.

Use the tire outside of the designed limit and premature failure increases.

>>>>>>>>>>>>>>Action

[xrvr]

Originally Posted by Howard L.

I have no idea what you are trying to say there Avion. Not sure why you would think I would say ". Take a look at your tandem tires during a sharp backing turn. ". and not have done so myself. But listen, you don't have to believe any statement posted here. Why don't you set up a sharp backup turn, get out and check for yourself.

Good, so you do have experience and are not just repeating. Answers my question. Thanks