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Old 10-16-2013, 07:09 PM   #31
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Did not know the tires were rated for speeds up o 65. That is really good to know. I usually do around 65 but driving 10 hours to Virginia, I did pick up the page a bit. After reading all your comments it really makes you think. I don't think I will travel that far in one day anymore with the camper. Thinking six hours or so is a drive with trailer. Drove the ten hours to Virginia and I felt the same way I did as if I dove my 17 to 20 hour drive to Florida without the camper. Pulling the trailer makes you more tired. There were some eye opening comments, Thank you.
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Old 10-16-2013, 08:04 PM   #32
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Quote:
Originally Posted by Donedroolin View Post
Did not know the tires were rated for speeds up o 65. ... Thank you.

Most special trailer tires are speed rated to 65 mph. Speed rated is not speed limited. Tire pressure can affect the speed range. Too little tire pressure is a greater sin than too much pressure. Consult your tire manufacturer information.

Personally I would not run my trailer tires at less than the max rated pressure listed on the sidewall. In my experience that mode gives good wear and puts the tire in a range for higher speeds.

Below is some specific information for
Goodyear Marathon Tires

Special Trailer ("ST") Tires

Goodyear Marathon trailer tires are widely used in a variety of towable trailer applications and are designed and branded as "ST" (Special Trailer) tires.

Industry standards dictate that tires with the ST designation are speed rated at 65 MPH (104 km/h) under normal inflation and load conditions.

• Based on these industry standards, if tires with the ST designation are used at speeds between 66 and 75 mph (106 km/h and 121 km/h), it is necessary to increase the cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated maximum load.

o Increasing the inflation pressure by 10 psi (69 kPa) does not provide any additional load carrying capacity.
o Do not exceed the maximum pressure for the wheel.
o If the maximum pressure for the wheel prohibits the increase of air pressure, then the maximum speed must be restricted to 65 mph (104 km/h).
o The cold inflation pressure must not exceed 10 psi (69 kPa) beyond the inflation specified for the maximum load of the tire.

More info is here:
http://www.tirerack.com/images/tires...plications.pdf

If the link doesn't work then just add www. to this

tirerack.com/images/tires/goodyear/Marathon_Special_Trailer_Applications.pdf

What Carlisle says:

Inflation

Underinflation is the number one cause of trailer tire failure. Low
inflation pressure elevates tread temperature, especially as speed
increases.

Review - Practices for Safe Trailer Tire Use

– Maintain air pressure at the maximum PSI recommended on the
tire sidewall.

http://www.carlisletransportationpro..._Practices.pdf

vic
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Old 10-17-2013, 03:01 AM   #33
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We normally run 65 to 68 mph when pulling our Pinnacle.
We do have "G" Rated LT Tires that are speed rated at 75 Mph.
At 65 to 68 mph is where our Truck shifts into 6th gear and the engine runs at 1600 to 1700 rpm, which it seems to like and does not lug.
Also fuel mileage is pretty good, usually get 10 to 11 mpg which is not bad for a trailer that weights 15,600 lbs. loaded and Gross Combined weight of 24.000 lbs.
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Old 10-17-2013, 03:37 AM   #34
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we travel at 65, unless on I91 in Hatfield MA. thats a long flat straight away and i do get up to 70
Coming back from Vermont on Columbus day we did have a TT pass us doing about 80 i was only hoping if anything happened the debris on the highway would be cleaned up before we got to the "scene"
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Old 10-17-2013, 05:12 AM   #35
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60-65 mph.
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Old 10-17-2013, 06:39 AM   #36
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Quote:
Originally Posted by VicS1950 View Post
• Based on these industry standards, if tires with the ST designation are used at speeds between 66 and 75 mph (106 km/h and 121 km/h), it is necessary to increase the cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated maximum load.
I normally run around 60 on 2 lane roads and 65-70 on interstates. Seeing this about the Marathons, I will have to up the cold pressure before interstate trips.
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Old 10-21-2013, 04:29 PM   #37
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60-70, I know I should probably slow it down though.
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Old 10-21-2013, 04:37 PM   #38
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I usually try and keep between 60-65 if highway and other variables are favorable. If posted speed limit is 70+, I still try and maintain
60-65 and keep it the right hand lane. If posted speed limit is 55, no problem, I will do 55 and stay in the right hand lane...
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Old 10-21-2013, 08:44 PM   #39
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Depends on the time we are traveling. Many times we travel at night with the truckers, I run the powerstroke flat out around 80-85 pulling the 334RBTS. Just need to keep an eye on wheel bearings and tires.
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Old 10-23-2013, 11:25 PM   #40
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My trips tend to be less than 4 hours - so doing 65 instead of 75 has a trivial impact on my arrival time. On longer trips I've been known to pull at 75 or so for periods of time when legal. Keep an eye on tires and bearings. That said, it's hard to watch tire temps at 75 MPH.....

-Chak
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