max speed - Fiberglass RV


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Old 09-10-2014, 01:55 PM   #1
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max speed

Does anyone know what the max speed is for a CT-13 re: the hubs and tires. I'll be pulling with an X5 (BMW) so pretty stable.
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Old 09-10-2014, 02:01 PM   #2
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Does anyone know what the max speed is for a CT-13 re: the hubs and tires. I'll be pulling with an X5 (BMW) so pretty stable.
Maximum for ST tires is 65 mph. ST is the designation for trailer tires designed to be used on trailers. Other tires can cause problems. It is strongly suggested that 55mph to 60mph is your towing speed on the highway. This speed seems to be about the safest speed to travel. Plus the mpgs are helped by staying in that range.

You'll get some differing opinions on this site.
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Old 09-10-2014, 02:17 PM   #3
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Of course that's assuming that a) The hubs and bearings were recently inspected and repacked and b) that the tires are properly inflated per the side wall information panel.

But more critical though is that the tires were inspected for date of manufacturer. If they are dated more than 5 years ago, 55 is about it, if more than 7 year ago, better stick with 25 so there isn't much damage when they blow out on the way home.

Tire age is a very serious issue with trailer tires, especially in hot sunny climes.
Here's a link for reading tire age numbers: http://www.tirerack.com/tires/tirete....jsp?techid=11

And some tips about trailer tires:
Trailer Tire Facts & Information | Trailer Tire Applications | Discount Tire
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Old 09-10-2014, 02:44 PM   #4
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if you cross the California line the limit it 55 mph towing a trailer. Doesn't matter what you tow it with.
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Old 09-10-2014, 02:54 PM   #5
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For me there are three speed limits.

First the limits of the system. Generally ST tires have a maximum speed of 65 mph, actually stamped on the tire. There is some debate on the topic, where it has been stated that if you increase the cold pressure beyond the max suggested pressure of 50 psi you can drive faster.

Second, there are state speed limits for towing a trailer. Thirteen states have 55 mph as a maximum towing speed. My home state of NH is 55 mph. I believe this varies from 55 to 70 mph depending on the state.

Third, there are road conditions like high winds and inclement weather, both of which cause me to slow down. The behavior of trailers in strong side winds can be an issue.

There are many on the site who have had tire blowouts. Speed and temperature can be a factor in tire failure.

The faster you drive the more tire flexing per mile, the higher the tire temperature (and pressure). (Tires are continually changing shape as you drive, moving from flat at the bottom to circular.)

The hotter the weather the higher the tire temperature (and pressure).

My personal approach is tires at maximum cold pressure, follow speed limits, tire limits and local speed limits and minimize heat of the day driving.
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Old 09-10-2014, 05:58 PM   #6
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Third, there are road conditions like high winds and inclement weather, both of which cause me to slow down.
On many occasions I had to slow down to 20-25mph in a heavy rain condition (driving on 75mph speed limit interstate). Flashers turned on and try to stop on a shoulder if the shoulder width is safe enough to accommodate the car or the car/rig combo.
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Old 09-10-2014, 06:04 PM   #7
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speed limnits by state

nice info re: speed limits

Towing World Official Website
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Old 09-10-2014, 06:11 PM   #8
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nice info re: speed limits

Towing World Official Website
It didn't take long to find what I believe is an error. Washington State's towing speed limit law is the speed as for trucks Maximum 60 mph.

Word to wise, double check any site that provides this type of data.
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Old 09-10-2014, 06:16 PM   #9
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nice info re: speed limits

Towing World Official Website

A second error. Oregon Laws "Brake laws trailers" "not stated",,, Yes it is stated. It stated as brakes required for a trailer of x weight. It's stopping withing x feet when traveling at x mph. It doesn't matter towing or not. Don't be fooled.
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Old 09-10-2014, 06:30 PM   #10
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Good point.......
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Old 09-10-2014, 08:08 PM   #11
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First the limits of the system. Generally ST tires have a maximum speed of 65 mph, actually stamped on the tire. There is some debate on the topic, where it has been stated that if you increase the cold pressure beyond the max suggested pressure of 50 psi you can drive faster.
Norm, it is not if the tire is pressured beyond 50 psi, that would never be wise if that was the maximum rating, but only if you can raise the pressure by 10 psi above the recommended pressure for the rated maximum load, which is usually less than the 50 psi. If you can do this, then the allowed speed rating goes up to 65 mph.

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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 Goodyear Marathon and Power King Towmax STR tires featuring the ST size designation may be used at speeds between 66 and 75 mph (106 and 121 km/h) by increasing their cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated maximum load.
Do not exceed the wheel’s maximum rated pressure. If the maximum pressure for the wheel prohibits the increase of air pressure, then maximum speed must be restricted to 65 mph (104 km/h).

The cold inflation pressure must not exceed 10 psi (69 kPa) beyond the inflation specified for the maximum load of the tire.

Increasing the inflation pressure by 10 psi (69 kPa) does not provide any additional load carrying capacity.
Man, I can't believe I got into yet another tire speed rating discussion. I sure hope I don't have to moderate myself.
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Old 09-10-2014, 08:57 PM   #12
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Personally, I would want to stay out of the way of anyone that needs to tow faster than 65 MPH. And those that do, probably wouldn't pay any attention to cheesy tire speed specifications anyway... Burn,...

And wasn't it Marathon tires that had a higher than expected failure rate a while back???
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Old 09-10-2014, 09:22 PM   #13
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Looking for Clarification

Jim,

I do not suggest pressuring the tires beyond 50 psi nor would I suggest driving faster than 65. I only point out the possibility because it always becomes a bone of contention on the site.

I guess I don't understand the rule. According to your statement

"by increasing their cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated maximum load."

It seems to me that the maximum load for a tire is achieved at the maximum pressure. Isn't the 'recommended pressure for rated maximum load at 50 psi?

I do know you should not exceed the pressure rating of the rim/wheel.
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Old 09-10-2014, 09:58 PM   #14
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It seems to me that the maximum load for a tire is achieved at the maximum pressure. Isn't the 'recommended pressure for rated maximum load at 50 psi?
Correct that maximum load is achieved at maximum pressure, but recommended pressure is based on trailer weight, and can often be well below 50 psi. If the recommended minimum pressure for your trailer weight, is 10 or more psi below 50, then by increasing at least 10 psi, you can use a maximum speed of 75 mph with them, if you wish.

If you look at the chart on the bottom page 9 of this Goodyear Tire Care Guide, you will see the recommended minimum inflation for various weights on their tires. Many of our trailers are so light, that we could be well under the max of 50 psi, and there usually room for 10 psi more to be added.

http://www.goodyearrvtires.com/pdfs/tire-care-guide.pdf

I think the term recommended depends on who recommendation it is. Me, I always recommend that trailer tires be at maximum pressure, as I see no benefit to not, and lots to keeping it there.

Clear as mud?
I first had this explained to me by my cousin, who was the service manager at a large commercial tire shop, but I am a bit better at understanding, than explaining.
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