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Old 01-30-2015, 03:48 PM   #1
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Thumbs up carlisle-radial-trail-new speed ratings

Carlisle Radial Trail RH speed rating over 65mph - TundraTalk.net - Toyota Tundra Discussion Forum
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Old 01-31-2015, 12:01 PM   #2
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You can only take it to the bank when it's actually printed on the tire's sidewall. And there is no such thing as a letter J, 65 MPH tire.

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Old 01-31-2015, 12:14 PM   #3
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The speedometer in my car goes to 165 MPH.
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Old 01-31-2015, 01:21 PM   #4
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Actually, we had gotten something from Carlisle about this the other day at the shop. I do remember it being that some kind of tire they had was speed rated for over 65mph.

and Carlisle states the same on their website as the link above in the OP with a few caveats:

http://www.carlisletransportationpro...m/about-us/faq

How fast can I travel on Carlisle trailer tires?

In the past, most trailer tires were rated at 62 or 65 mph. Today, some of our tires are "rated" (speed symbols) at 87 mph (N), some at 75 mph (L), some at 65 mph (J: ST tires) and some at 62 mph (J: non-metric tires).

Please remember that speed ratings are test speeds and not recommended driving speeds. The ratings apply only to the tire itself, and not a particular vehicle. The speed rating does not mean that the vehicle can be safely operated at the tire's rated speed.

We recommend driving no more than 60 mph when towing a trailer. Please always drive at a safe speed and abide by the posted speed limit.
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Old 01-31-2015, 07:53 PM   #5
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Thanks wmtire
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Old 02-01-2015, 12:07 PM   #6
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The reference shows a TRA approved tire speed code chart. There is no code for 65 MPH. The TRA says ST tires can have speed ratings as high as 81 MPH.

Speed_code_chart - iRV2.com RV Photo Gallery

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Old 02-01-2015, 12:44 PM   #7
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I've been doing a lot of research about tires lately as a blow out while towing sounds like a nightmare I don't want to experience.

Our Wildcat came with Taskmaster Provider ST235/80R16 Load Range E tires installed on it. On the Taskmaster website (Provider ST Radial | Taskmaster) these tires are listed as having a speed rating of M (up to 81 mph). This is also the same information provided about these tires at Etrailer.com (Provider ST235/80R16 Trailer Tire w/ 16" Silver Mod Wheel - 8 on 6-1/2 - LR E Taskmaster Tires and Wheels TTWA16RTK8SM).

While I have no desire to tow that fast (>70 mph), I would be willing to tow at 65-70 mph on interstate highways depending on traffic and weather conditions but only if the tires are actually safe to operate at that speed. I had read previously that all ST tires are speed rated to only 65 mph...but the information I'm finding seems to contradict this.

Any help to clarify which information is correct is appreciated.
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Old 02-01-2015, 03:16 PM   #8
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IMO the only speed ratings that can be trusted are those actually molded into the individual tire's sidewall OR published on the individual tire manufacturers letterhead OR from the TRA.

Here is a reference to a tire safety blog by Roger Marble. He is a tire engineer with more than 30 years experience. He has access to TRA manuals. His answer on this subject will be just as long as mine but with more credence.

RV Tire Safety

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Old 02-01-2015, 09:21 PM   #9
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Our Wildcat is sitting in storage right now but the next time I go check on it I'll get the speed rating off the sidewall. As previously mentioned, I guess that's the only way to be certain.

I'm hoping it's as stated on the manufacturer's website as I'd like to be able to travel 65 mph on 2 lane roads without worrying about over-taxing the capability of the tires. Although, I'm usually content with travelling at slower speeds, a Colorado legislator recently proposed introducing a new bill in regards to slow moving vehicles impeding traffic. His proposal states that if 3 or more cars are stuck behind your vehicle then you must pull over and allow them to pass.
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Old 02-02-2015, 05:43 PM   #10
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Carlisle has introduced a couple of new sizes with their 2nd generation Sport Trail LH bias ply tires.

There is now a ST205/85D14.5 LRF with 2830# of load capacity at 95 PSI. And, the ST225/90D16 LRE with 3520# of load capacity at 80 PSI.

The 14’5” tire has a diameter of 27.8” and the 16” has a diameter of 31.8”.


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