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Old 03-09-2007, 10:46 PM   #29
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brooklyn park , Minnesota
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airstream top speed

thank you all for having common sense and airstreams. I had the impression from reading trailer life and other rv mags that all most of you wanted was more power and enough torque to do the rocky mtn passes at 70 mph with a 35 ft rig behind you. After driving a school bus for 22 yrs, I can tell you that if I could ever get that much weight up to 70 mph, the only thing that will stop that in less than 900 ft would be a large stone wall. Do you all leave a 900 ft interval when towing? I top out at 60mph, except to pass. Too much invested in our 65 caravel to rush to death. joe q in MN(slippery here,too)
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Old 03-11-2007, 09:17 PM   #30
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Quote:
Originally Posted by joqin
Too much invested in our 65 caravel to rush to death.
and my beautiful 7 month baby boy
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Old 03-11-2007, 11:04 PM   #31
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Joqin,

Amen to your thought process. My rig is approx 14,000lbs. Last winter on the way to Sarasota, on interstate 75S, the traffic was backing up where it exits to Tampa. From 62mph, it takes for ever to pull the rig down and I have the gmc four wheel discs plus I keep my trailer drum brakes adjusted evenly and on the tight side.

It did stop in time, 5-6 ft to spare but, it is amazing what goes thru your mind during a panic stop.
I tow 58-62mph and that is it. There is no place I am going in that big of a hurry.
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Old 03-12-2007, 11:02 AM   #32
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Quote:
Originally Posted by urbanfood
please let us know when you'll be on the road next time because i'll go play golf that day.
I agree with urbanfood.

Neil, please do us all a favor and let us know where you and "Johnny Lighting" will be when you are conducting your Car & Driver "insanity" trailer trials.
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Old 03-13-2007, 08:31 AM   #33
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Tire Ratings

LI Pets, ljmiii, Coloradobus
Irreguardless of who said what, or what some factory rep said, the official position of Goodyear Tire is found on their web site.

http://www.goodyear.com/rv/pdf/rvbrochure.pdf

For the Goodyear Marathon, the specifications are found on page 9 of this brochure.

Upon reading the page you will see that the Goodyear Marathon is Speed Rated at 65 MPH, not what some district rep said who is trying to maintain the myth of the high quality ST tire.

What is in writing on the web site is all Goodyear will claim responsibility for, period.

The only reasons that I can think for increasing the tire pressure 10 PSI is to cut down on the heat generation caused by the flexing sidewalls, or to make a louder bang when they let go so that you will be able to hear them better.

Running the ST tire at 75 mph represents operating the tire at 115% of its rated speed and adding 10 PSI is overpressuring the tire to 115% of it rated pressure.

Am I the only one who sees something very wrong in this?

You all have a choice, slow down or go to a more capable rated tire.
You've bought the best, most durable piece of RV equipment available. Why take a chance on tearing it up with tires that do not have the capability of withstanding our present driving habits?
The choice is ours.
Slow down or go to different tires.
Its that simple.
Beginner
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Old 03-13-2007, 11:10 AM   #34
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Quote:
Originally Posted by Beginner
LI Pets, ljmiii, Coloradobus
Irreguardless of who said what, or what some factory rep said, the official position of Goodyear Tire is found on their web site.

http://www.goodyear.com/rv/pdf/rvbrochure.pdf

For the Goodyear Marathon, the specifications are found on page 9 of this brochure.
Um...that IS the document we are quoting.

Middle of Pg 9 in tan box -

IMPORTANT OPERATING INFORMATION
Industry standards dictate that tires with the ST (Special Trailer) designation are speed restricted to 65 mph under normal inflation and load conditions, unless a different speed restriction is indicated on the sidewall of the tire.

Based on industry standards, if tires with the ST designation are used at speeds between 66 and 75 mph, it is necessary to increase the cold inflation pressures by 10 PSI above the recommended pressure for the load.

* Do not exceed the maximum pressure for the wheel.
* If the maximum pressure for the wheel prohibits the increase of air pressure, then the maximum speed must be restricted to 65 MPH.
* The cold inflation pressure must not exceed 10 PSI beyond the inflation specified for the maximum load of the tire.

Pg 16 has the load/inflation chart that specifies maximum load for a given inflation pressure

For ST225/75R15s load rated "C" tires 40 PSI is 1880lbs and 50 PSI (max) is 2150lbs
For ST225/75R15s load rated "D" tires 55 PSI is 2270lbs and 65 PSI (max) is 2540lbs

Thus, you can run Cs at 50 PSI at max load 2150 lbs at up to 65 MPH or max load 1880lbs at up to 75MPH

And you can run Ds at 65 PSI at max load 2540 lbs at up to 65 MPH or max load 2270lbs at up to 75MPH

Obviously no matter what tire or speed you choose, being at a solid percentage less than 'max load' is a good thing.
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Old 03-13-2007, 11:25 AM   #35
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Guys, why do you have to try to run your rigs so fast? The journey is supposed to be part of the trip, and if you go so fast you are stressed out for the entire trip, why bother to go? Why keep trying to find loopholes in tire ratings and speed limits? Slow down, enjoy the journey, be safe, and don't worry so much about how much faster than 65 some states will allow us to go, if we have more guts than brains.
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Old 03-13-2007, 01:08 PM   #36
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If you pass, I could see exceeding 65mph for short lengths, but for the most part I feel around 62mph is a good, comfy and safe pace.
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Old 03-13-2007, 02:18 PM   #37
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Quote:
Originally Posted by overlander63
Guys, why do you have to try to run your rigs so fast?
I'm not trying to go so fast - on the open road I like to go 65 max.

But what I am trying to do is keep with the flow of traffic in the slow lane of the US Interstate Highway system. And to do so safely by ensuring that the tires, brakes, and everything else I can choose for my rig are capable of running at any speed between 55 and 75 MPH. And go as quickly as possible from 75MPH to 0. And from 0 to 75MPH.
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Old 10-30-2017, 03:29 PM   #38
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I'll run up to 90 as test.

But I re-opened this to find that new $40k AS. (Oh, 2007. Rats).
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Old 10-30-2017, 04:43 PM   #39
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Sometimes it's just, "I feel the need, the need for speed!"

In a practical sense, its handy to be able to do the speed limit in certain areas, but generally I run at around 55-65 under normal conditions on the flat sections of the highway. Easier on the gasoline mileage...
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Old 10-30-2017, 04:54 PM   #40
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Hi

Re-reading this from "back a while", things have changed a bit since then. Putting the Michelin LT's "eliminates" one of the basic issues. I'm still not going to try 106 MPH either in my F-250 solo *or* towing. As noted in other threads, conditions do matter a lot. Under the right conditions, you can indeed go .... errr.... pretty fast ..... how much past 75 MHP? no idea. For any normal driving situation way slower than that is just fine by me.

Bob
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Old 11-04-2017, 11:17 PM   #41
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there are plenty of 70 and 75 mph speed limits in NM and CO. but we never tow that fast. I have been told that most TT tires are only rated for 62 sustained speed. so we go between 60-65, normally on the high side of that range.
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Old 11-05-2017, 06:19 AM   #42
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I upgraded to the Michelin 16" 80psi tires before our East Coast trip. The inside of the trailer looked like an earthquake hit it when we got home.
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