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Author Topic: Towing speeds  (Read 7813 times)
aladdin4x4
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« Reply #15 on: August 22, 2013, 08:47:17 PM »

I do 70 mph or so with my taos.  On the other hand, I have much larger tires than stock and they are rated at a much higher load than necessary.

Here's some documentation on tire speed rating.
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=219
« Last Edit: August 22, 2013, 08:49:01 PM by aladdin4x4 » Logged

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« Reply #16 on: August 23, 2013, 06:19:21 AM »

I ordered and put one of these on the back of my camper

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« Reply #17 on: August 25, 2013, 10:10:13 AM »

I do 70 mph or so with my taos.  On the other hand, I have much larger tires than stock and they are rated at a much higher load than necessary.

Here's some documentation on tire speed rating.
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=219

So they are rated to 65 mph, unless you over inflate the tire. I wouldn't.



Special Trailer (ST) Tire Speed Ratings

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

However industry standards also stipulate, if tires with the ST designation are used at speeds between 66 and 75 mph (106 and 121 km/h), it is necessary to increase their cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated


Now, having said all that. There are ST tires rated to 100 mph. But they are pricy, and will not be found as standard equipment
« Last Edit: August 25, 2013, 10:13:20 AM by allan » Logged

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aladdin4x4
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« Reply #18 on: August 25, 2013, 01:03:37 PM »

Agreed, I wouldn't over inflate tires either. 

My tires are rated for 1360 lbs per tire at a max pressure of 50 PSI.  Per the Load/Inflation chart from the manufacturer of my tires, at 25 PSI, the tires are rated at 990 lbs each.

Almost fully loaded, I have 631 lbs on the passenger side tire and 644 lbs on the driver side tire, well below the rating of the tires even at the lowest safe pressure.  Per industry standards, all I have to do to safely run 75 mph is inflate my tires to 35 PSI. 

In actuality, I just run them at 50 PSI so I get better mileage. 

The industry standard does not mean you over inflate your tires.  You still have to remain within the max specified on the sidewall of the tire.  It just means you have to look up the load charts for the tires and know how much your trailer weighs.
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« Reply #19 on: August 25, 2013, 02:32:08 PM »

http://www.us-tra.org/members/documents/MINassoc0712.pdf

Has the standard changed to a guideline? Is this on the sticker on the tire? Does it void the warranty to follow the posted legal speed limit?

E. INDUSTRIAL TIRE AND RIM STANDARDS
2. IND-12-3 – CLARIFICATION OF SPEED GUIDELINES FOR ST SPECIAL TRAILER TIRES
After review and discussion, it was approved to transfer note 4 on page 6-41 of the 2012 Year Book to page 6-37 of the Engineering Design Information to be a guideline for ST tires. It was further approved to add a new note 4 on page 6-41 as follows:
“4: For tires not marked with a service description, consult the tire manufacturer for applications above 65 MPH.”
Consequently, note 2 on page 6-37 of the 2012 Year Book was changed to the following:
“2: For tires not marked with a service description, consult the tire manufacturer for applications above 65 MPH.”

Couple of problems, manufacture won't respond or multiple responses contradict each other.

I save this one and deleted another that suggested they no longer suggest increase pressure ... Big Smile

'Carlisle's recommended speed rating is the local speed limit in your area.'
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aladdin4x4
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« Reply #20 on: August 25, 2013, 03:08:34 PM »

Good find rabird.  Think you can find the one where they suggested not to increase pressure?

I'll have to see if I can dig up some of the standards they're talking about, but I'll need my work computer for that. 
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« Reply #21 on: August 25, 2013, 04:10:07 PM »

It was an email I deleted promptly, ' we no longer blah blah', email em.

http://www.carlisletransportationproducts.com/about-us/contact-us

Over the last 10 yrs or so they (feds) considered updating vehicle tire tests, they did and they are somewhat tougher (FMVSS 139). ST tires and 8-12 rim diameter tires got to continue on with the ole test most tires underwent (well several tires must pass the individual test before the tire can be sold on the market). The 34 hr endurance test seems to be the toughest, in a 100F chamber, various loads, speed. FMVSS NO. 109, the speed test ain't too tough except it is in a 100F chamber. I don't tow in temps that high!

S5.5High speed performance.
S5.5.1After preparing the tire in accordance with S5.4.1, mount the tire and wheel assembly in accordance with S5.4.2.1, and press it against the test wheel with a load of 88 percent of the tire's maximum load rating as marked on the tire sidewall.
S5.5.2Break in the tire by running it for 2 hours at 80 km/h (50 mph).
S5.5.3Allow to cool to 38° ±3 °C (100° ±5 °F) and readjust the inflation pressure to the applicable pressure specified in Table II.
S5.5.4Without readjusting inflation pressure, test at 121 km/h (75 mph) for 30 minutes, 129 km/h (80 mph) for 30 minutes, and 137 km/h (85 mph) for 30 minutes.
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aladdin4x4
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« Reply #22 on: August 26, 2013, 07:48:12 PM »

Well, it looks like my company doesn't have access to the Tire and Rim Association "Year Books" so I guess we won't be able to elaborate on what the Ind-12-3 paragraph is and what the rest of the standard is.  A quick google search only brought up how to purchase it for slightly over $100. 
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« Reply #23 on: August 31, 2013, 05:24:39 PM »

I normally set the cruise control at the posted speed limit, which is 70 MPH in my part of the world, if I'm towing or not.  I've never had any tire problems or law enforcement "complaints" (even in Georgia).

Buy tires that will comfortably carry the weight of your trailer, and use a weight chart to help determine proper air pressure.  If max pressure is required to carry the weight of your trailer, then buy the next higher load range.  If you do this and keep them properly inflated and maintained, they can handle posted speeds because they won't get that hot.  If you're close to max weight and therefore max pressure, then watch your speed because you're already pushing the limits.
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« Reply #24 on: September 10, 2013, 10:59:18 AM »

it does not matter which ST tire you get they all have on the side max speed 65 mph.  I think it is a class of tire "ST" that DOT specified must have that max seed ratting of 65 mph or less.   

My good years marathons say max speed 65 mph, but the Canadian service bulletin said if traveling over 65 mph add 10 psi to the air.   Now I don't get it since Canada is a metric speed country and it should be in km?  Who were they writing the bulletin for? You think the US trailer pullers but did not want an issue with US DOT??

We pull a lot at 65, but we keep close to the flow of traffic and have no concern going 70 and 75. But on some highways where people are traveling 80 to 90 we are the slow poke traffic hazard.
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« Reply #25 on: September 10, 2013, 12:41:25 PM »

Quote
but the Canadian service bulletin said if traveling over 65 mph add 10 psi to the air.   Now I don't get it since Canada is a metric speed country and it should be in km?  Who were they writing the bulletin for? You think the US trailer pullers but did not want an issue with US DOT??

A long time ago the industry standard RV tire inflation guide stated exactly that. And it had had an additional footnote that if you did this you needed to de-rate the load capacity, something like 10%. Unfortunately, I lost my copy when I had a hard drive crash.
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« Reply #26 on: September 11, 2013, 05:14:34 AM »

I don't care what speed others are driving at.  I tow at 55.

I'm with you.  I tow at 90 km/h (56 mph).  It's just a matter of picking a spot in the slow lane and letting everyone pass me.  Easier on the truck, tires, and gas.  Easier on me too.  Wink
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« Reply #27 on: September 11, 2013, 03:49:44 PM »

I see a 20% improvement in fuel consumption if I drive at 97 km/h (60 MPH) vs. 105-108 km/h (65 MPH).  And it's so much more relaxing.  That improvement is nothing to sneeze at but man, those dashed lines are loooooong at slower speeds.  Big Smile
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« Reply #28 on: September 12, 2013, 03:35:07 AM »

Towing or not, I drive the speed I want to and don't really care what speed anyone else is going.  Of course, I stay in the right lane unless passing someone and will pull off to let others go by if I'm on a 2 lane although that is rarely necessary.

I tow at 63-65 on the interstate and generally go about 5 MPH over the posted speed limit everywhere else except for specific speed zones such as construction or school zones, in which I go the speed limit.  If not towing, I generally go 75-78 on the interstate.

I learned a long time ago that the majority of my driving is destinations less than 3 hours away and you just don't save much time over that driving distance.   Certainly not enough to make up for the traffic ticket.
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« Reply #29 on: September 12, 2013, 05:17:41 AM »

I always over inflate my tires by 5 to 10 psi.  They ride better they don't squat and if I travel faster then 65 I'm safer.
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