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Old 07-31-2008, 10:43 AM   #15
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Believe it or not - I still have not gotten my new tires & must order them today. I am not sure the weight of my Safari, loaded (water, goods, etc..) but would'nt it be better to have a e rated tire - because of the weight of the trailer? I also have E rated tires on my tow vehicle....
E rated tires on your Safari, is a sure way of causing damage to it, guaranteed.

You don't have the weight to need the "E's".

Secondly, you will also destroy the soft ride that your trailer demands.

Andy
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Old 07-31-2008, 11:53 AM   #16
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A lot of Airstreamers have switched to Maxxis tires. You don't need more than a D load Range. If you can't find Maxxis tires locally, you can buy them direct from there website(free shipping) and have them installed locally. I bought mine online and paid $80 to have all four mounted and balanced.
https://www.shopmaxxis.com/b2c/
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Old 07-31-2008, 12:27 PM   #17
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E rated tires on your Safari, is a sure way of causing damage to it, guaranteed.

You don't have the weight to need the "E's".

Secondly, you will also destroy the soft ride that your trailer demands.

Andy
ANDY- What is the weight of a 66 SAFARI & is that the weight with the water tank full?

Did the 66's come with 5 or 6 lug wheels?
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Old 07-31-2008, 12:47 PM   #18
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New Tires

I just purchased 4 D rated Maxxis tires from UnserTire.com. These are ST trailer tires. Unser shipped me the freight free and came in three days. I paid about $95 a tire. Good price and good service.

Mark
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Old 07-31-2008, 12:47 PM   #19
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Is the MAXXIS tire a good tire & is that a big company? Not many big name places carry the MAXXIS.....
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Old 07-31-2008, 12:51 PM   #20
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ANDY- What is the weight of a 66 SAFARI & is that the weight with the water tank full?

Did the 66's come with 5 or 6 lug wheels?
The empty weight of your trailer is 3360 pounds.

Full of water, the water tank and water heater adds another 320 pounds.

The AC adds about 110 pounds.

The axle rating is 5000 pounds.

"D" Marathons are 2540 pounds each, for a total of 5080 pounds.

The total empty weight with full water and an AC is then 3790, which leaves you with 1210 pounds available for a payload, less your LPG bottles.

The "D" tires match the axle and allow plenty of payload, "if" your axles are in good condition. If not, then the trailer will bottom out, causing damage to it. If that's the case, even "E" tires will not help the trailer, instead it will make the ride even rougher, causing more damage.

The original drums had 6 lugs.

5 lugs do not have the proper capacity.

I can tell you how the trailer was built, except for the options, but I cannot tell you how your trailer may be equipped.

Previous owners, sometimes do wonderous, not very smart things.

Andy
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Old 07-31-2008, 12:56 PM   #21
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Thanks andy!!!
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Old 07-31-2008, 01:22 PM   #22
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Can anyone tell me what speed the Goodyear TT are rated at. ? I have ST 225 75rx 15 range D I usually trave between 58 & 62 but If I have to pass and reach 70 to 75 I beging to worry if they are safe
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Old 07-31-2008, 02:28 PM   #23
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Can anyone tell me what speed the Goodyear TT are rated at. ? I have ST 225 75rx 15 range D I usually trave between 58 & 62 but If I have to pass and reach 70 to 75 I beging to worry if they are safe
The following information is provided by Goodyear, specificly for the Marathon ST tires.

Industry standards are restricted to 65 mph, under normal inflation, for the ST (special trailer) tires.

They also say, that industry standards for the ST designation, can be used at speeds from 66 to 75 mph, however, the cold tire inflation MUST be increased 10 psi, above the recommended pressure.

The cold inflation pressure, must not exceed 10 psi, beyond the inflation specified for the maximum load of the tire.

Important tire care information and the load/inflation tables are available on Goodyear's Recreational Vehicle web site at On The Wings of Goodyear | RV Tires - Home

Additionally, the steel wheels as used by Airstream, MUST NOT exceed 75 psi, with a "COLD" tire.

Vehicle speed, load and inflation pressures, and proper balancing, all of which are within the control of the driver, are CRITICAL FACTORS for the safe and enjoyable operation.

Andy
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Old 07-31-2008, 03:26 PM   #24
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Andy, perhaps you can help me figure these load tables out. I have a 30' Safari with a GVWR of 7,500 LBS, if I remember correctly (I don't have the paper work here at the office). Dry weight, IIRC, is 6,800 LBS.

When I purchased the trailer new in 2006, the dealer did an excellent job of pre-walk through prep from what I could tell. I asked key questions that I had learned on this forum such as did he pack the bearings and he said yes. I later confirmed he had when I had the bearings re-packed the following Spring as part of my pre-season prep. Anyway, the tires contained 48-50 PSI in each tire per my digital gage the first time I checked them. I thought this was low per the Goodyear table I had discovered through a link in another thread on this forum at the time so I increased the pressure to the max of 65 PSI feeling this would give me a safety margin for travel on interstates and passing semi's on hills. Admittedly, I didn't understand how to read the table then and still am not sure I do now.

When I divide my GVWR of 7,500 by 4 tires I get 1,875 LBS of load per tire. In the chart the column with the next number above 1,875 says I need 45 PSI in each tire for a max speed of 65. Am I calculating the load correctly?
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Old 08-01-2008, 10:57 AM   #25
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Andy - I think the people using E rated tires are not inflating them to the E rating at 80 psi but rather running 50 - 60 psi to restore the "soft ride" while getting a tire with a better speed rating than the Marathon.

If you take Goodyear's advice and add 10 psi to feel comfortable about the 65mph range aren't you also killing the "soft ride" of a D Marathon?
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Old 08-01-2008, 01:56 PM   #26
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I left getting some new tires up to my mechanic. He put on "Hi Run", a brand I never heard of saying it was a good inexpensive tire. At the time I propbably would have chosen something more name brand, but the tires were on. 10,000 miles later and no complaints. But if anyone has any info on these tires I would be interested.
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Old 08-01-2008, 04:02 PM   #27
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You can order your tires from Tire Rack tirerack.com, and have them shipped to an installer (or shipped to you) - I highly recommend KO tire in Elk Grove Village. I ordered D rated Goodyear Marathons for my Bambi, and they are great. They replaced the original, 8 year old C rated Goodyear Marathons that were the original tires still on the trailer. They had plenty of tread, no weather checking, and had never presented any problems to the original owners, but the age made me nervous. The new tires, set to 60-65psi, track and ride great.
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Old 08-01-2008, 06:53 PM   #28
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oh, yeah, the original tires were not balanced. No weights whatsoever. Probably shook like crazy. The new Marathons have been balanced, and like all Goodyears (even the German Goodyears on my Sprinter) they took a lot of weight. Michelins hardly ever require much weight, in my experience, and if they'd offered a trailer tire I could use I would have bought them. OTOH, the Goodyesrs seem a good value. I pulled the wheels and took them over to the installer and picked them up later, as opposed to hauling the trailer over there.
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