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Old 09-29-2015, 04:58 PM   #15
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Originally Posted by Msmoto View Post
According to my research at Goodyear, the Marathon has a rating of 2150 pounds at 50 psi. You may want to contact Goodyear to confirm this and ask about the maximum pressure.

FYI, as I am also concerned about tires i have replaced the OEM wheels and tires with Firestone Transforce LT225/75R16 115/112R E. These I run now at 53 psi. They are rated up to 80 psi, but at the load I carry the correct pressure is about 50 psi. Maximum rating is 2680 pounds per tire or 10,720 for the four. My trailer is 7200 across the scales, so i have nearly a 50% safety margin.

On the Road 05.18.15 by Tommie Lauer, on Flickr

I find these run almost cool...never so hot that I cannot put my hand on them.

I purchased the wheels at 16" 6 Lug LH1 Black Hi Spec Aluminum Trailer Wheel
and the tires locally.
I have these same tires, but have a different wheel. 16" Sendel T03 wheels + Firestone TransForce HT LT225/75R16 tires + Centramatic balancers +Dill TPMS = comfortable towing/peace of mind-
60 psi in the tires- Still go 65 mph max, although the new tires and wheels are capable of more speed-
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Old 09-29-2015, 08:14 PM   #16
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Cost of new wheels/tires

Just FYI, the wheels and tires were about $1100 total, sold my OEM wheels and tires for $500....so the upgrade was about $600.....
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Old 09-29-2015, 08:42 PM   #17
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This post can cause many to loose it.

First, you need to do some comparing of what you have and what is the best fit for your AS. The cheap Goodyear's tires are all made in China,( on the side of the tire), some may be good but I see a lot coming apart. Last place anyone wants to be is on the side of the road thinking what do I do next.

Second, you need to put in Nitrogen, WHY ?

Air is composed of:
A. 1% Water Vapor and other gases and escapes up to 250 times faster than Nitrogen.
B. 21% Oxygen and escapes 3-4 times faster than Nitrogen.
C. 78% Nitrogen and is the largest molecule in air, is dry and non-flammable. Because of their large size, the nitrogen molecules are the least able to seep through the pores of the tire, therefore maintaining optimal inflation longer. By reducing the percentage of oxygen, water vapor and other gases in your tires from 21% to 7% or lower as compared to "plain old air", your tires will hold proper inflation pressure 3-4 times longer.

2. Increased Fuel Efficiency:
By using Nitrogen in your tires, and maintaining proper inflation pressure, the rolling resistance is reduced, resulting in better fuel economy. In fact, properly inflated tires can improve your gas mileage by about 3.3%. I'll take that any day.

3. Longer Tire Life:
By maintaining more consistent inflation pressure, and reducing rolling resistance, the tire doesn't wear as fast from the heat caused by under-inflation.

4. Increased Safety:
Under-inflated tires are the cause of 90% of blowouts. Nitrogen provides more reliable inflation pressure and reduces blowout potential.

If you run with Tires under-inflated, it will destroy the tire sooner than later, its not what AS puts on the side of your AS, go by what the tire is design for.

I change mine out with the LTX M/S 2 by MICHELIN TIRES: Michelin Tires' LTX� M/S2.

It's very hard to understand why AS would put a cheap tire on such a nice AS.
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Old 09-29-2015, 09:20 PM   #18
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I'm in it for a little more money- bought more stuff-
Sold my original wheels only for $200 on Airstream Classifieds-
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Original wheels- gone-
Click image for larger version

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New wheels, tires, Centramatic balancers, and TPMS installed-



Sent from my iPhone using Airstream Forums
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Old 09-29-2015, 09:25 PM   #19
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I spoke to the local Goodyear dealer and did some online research at Goodyear. The load range on the tire is the difference in the max pressure and load. The max speed according to Goodyear is 65MPH. Go to this web site for RV tires Goodyear RV Tires – Performance, Durability and Comfort for the information. I have about 20K on mine now with no issues.
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Old 09-30-2015, 05:02 AM   #20
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There have been several threads on Air Forums regarding tires. You can go to any reputable tire dealer and get universal information as to tire pressures, load ranges etc. The pressure charts are the same for all tires. I personally plan never to run anything but a load range D (or higher) ST tire on my 26 foot Overlander. I have run GYM's now for about 15 years with no problems. The GYM 225 75R15 load range D's we have on now state on the sidewalls 65 psi max. I keep them at 40 to 42 psi , keep them covered in storage (to prevent sun damage), spray them with ArmorAll Tire Foam monthly for the same reason and park them on pavement at home. Some folks in these forums will advise using LT's but that can be risky on tandem axles because of high sidewall stresses in sharp turns esp when backing. ST's are designed to take the extra side wall stresses on trailers. Do some more homework on the Forums and at several tire dealers and you will quickly learn all you need to know about safe tires for your rig.
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Old 09-30-2015, 09:02 AM   #21
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Question

Quote:
Originally Posted by dames7 View Post
This post can cause many to loose it.

snip...... you need to put in Nitrogen, WHY ?
Yep....I'm losing it. Not about the GYM's though, been using them since new.

Nitrogen really?

IMHO....a total waste of time & money...

I'll use dry air.

YMMV


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Old 09-30-2015, 10:32 AM   #22
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...And make sure you rub the valve stems with snake oil. They sell this at the same place they sell Nitrogen.
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Old 09-30-2015, 10:07 PM   #23
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Yep, load range C tires is what you have. My 1986 Sovereign came with Goodyear Marathon load range C tires when I bought it used 10 years ago. I considered going to 16" rims and Michelin load range D tires but chose to stay with the 225-75-15 tires it came with but went to a Maxxis load range D tire for piece of mind. Best choice I've ever made since I've put thousands of miles on them. If you are who I think you are, stop by the house in Tullahoma some time and we can talk Airstream. I'm on my second one.
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Old 10-01-2015, 07:21 AM   #24
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Nitrogen? and...

This helps to understand the issues:

http://www.tirerack.com/tires/tirete...jsp?techid=191

As noted, checking pressures regularly, keeping inflation proper, all more important than what is in the tire. In fact, the tire has so much air in it before inflation with Nitrogen that the difference in the actual function of the gas is minimal.

I check my tires and wheel torque before each trip, as a routine, "pre-flight" check list. After about four to six weeks, normal air in tires, the pressure may have decreased by one pound, but more than that and i have a leak which needs repairing.

Some of us prefer to do everything that we can to have maximum safety, thus, use nitrogen.

However, instead of using Nitrogen, I switched wheels/tires to 16". Once again, the larger wheel/tire combination allows a lower tire pressure and the resulting benefit is, that with a huge safety factor in weight carrying ability of the tires, I have in addition a much softer ride for the trailer.

The result of the lower pressures.....90% of the things which would bounce around, hangers in the closet, dishes, etc, now do not show any evidence of being bounced about.

Fuel mileage....of course best with about 100+ psi, or rock hard tires, as folks who have competed in mileage competitions have found out. But, correctly inflated tires are what is best for safety as an under inflated or over inflated tire, as determined by the load it is carrying, is more susceptible to failure from road hazards. And, even on the Interstate System, the roads are treacherous, and in very poor repair in many states.

Enough....
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