carlisle-radial-trail-new speed ratings

[bluewoo]

Carlisle Radial Trail RH speed rating over 65mph - TundraTalk.net - Toyota Tundra Discussion Forum

[Airdale]

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.

Airdale

[Flybob]

The speedometer in my car goes to 165 MPH.

[wmtire]

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.

[bluewoo]

Thanks wmtire

[Airdale]

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

Airdale

[Lefty59]

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.

[Airdale]

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

Airdale

[Lefty59]

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.

[Airdale]

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”.


Airdale

[Lefty59]

I finally made it out to the storage lot to check the sidewalls on my Wildcat trailer tires for a speed rating but I couldn't find anything on the tire sidewall regarding a speed rating...only tire size and load capacity. Am I missing something or is it legal to omit the speed rating on a trailer tire?

I sent an inquiry to Taskmaster to see if I can get confirmation of the information (speed rating M = up to 81 mph) posted on their web site.

[Airdale]

Originally Posted by Lefty59

I finally made it out to the storage lot to check the sidewalls on my Wildcat trailer tires for a speed rating but I couldn't find anything on the tire sidewall regarding a speed rating...only tire size and load capacity. Am I missing something or is it legal to omit the speed rating on a trailer tire?

I sent an inquiry to Taskmaster to see if I can get confirmation of the information (speed rating M = up to 81 mph) posted on their web site.

If there is no speed ratings found on the tire, certification label/tire placard or in the trailer's owner's manual the TRA says ST tires are rated at 65 MPH.

Airdale

[Tireman9]

Originally Posted by Lefty59

I finally made it out to the storage lot to check the sidewalls on my Wildcat trailer tires for a speed rating but I couldn't find anything on the tire sidewall regarding a speed rating...only tire size and load capacity. Am I missing something or is it legal to omit the speed rating on a trailer tire?

I sent an inquiry to Taskmaster to see if I can get confirmation of the information (speed rating M = up to 81 mph) posted on their web site.

If your tires are ST type i.e. the size description starts with ST Like ST215/70R15 LR-C then they have a max speed rating of 65 mph as all ST tires do.

If they were LT then there may be a "Service Description" such as 111/120/T which would be a T speed rating but most if not all tire companies have a 75 mph max speed rating for RV application even if the tire is rated higher for car or truck application.
This post may help.

[Happy Vibe]

On Taskmasters sight the PROVIDER ST RADIAL has a speed rating of M (81 mph) in some sizes and the tire description starts with ST.

[Lefty59]

Originally Posted by Happy Vibe

On Taskmasters sight the PROVIDER ST RADIAL has a speed rating of M (81 mph) in some sizes and the tire description starts with ST.

That's the same info (speed rating M) I found on their web site for my ST235/80R16 tires.

I'm not sure why they would post inaccurate or misleading info on their web site for all to see as the liability for doing so would likely be undeniable. I do wish the tire sidewall had the speed rating stamped on it though so that a person could be certain one way or the other.

I'm hoping they will answer my inquiry...but so far we haven't heard anything back.

[kentnjudy]

I emailed Maxxis a couple of months ago and asked them why they were calling the tires on my new Wildcat (optional tire) "high speed tires" when all ST tires are speed rated for 65 mph. The response (which I cannot find right now) was something like the tires are actually R rated, but they do not recommend towing above 65 mph. I guess that makes some sense. At least it alleviated my concerns about an occasional "burst" of speed to get around someone or to get a head start on the next hill or worse yet daydreaming for ten miles of freeway.

[Lefty59]

Here's a screen capture (if this works) from the Taskmaster web site:

[Tireman9]

- Looks like Taskmaster may not be consistent with their ratings. Their site has M (81), R(106), J(62) & L(75)
- This site shows N/A for speed rating.
- So does This site.
- This site shows N(87) speed rating for 16" but Taskmaster says the 16" tires are rated either M or L
- TireRack has a nice page explaining Speed Ratings for all except ST type tires. N=87 M=81
- TireRack on ST speed rating "Industry standards dictate tires with the ST designation are speed rated to 65 MPH (104 km/h) under normal inflation and load conditions. "

I have contacted both Discount Tire and Taskmaster and asked why they show different information.

[gashog]

Here's something that I should not post on this thread (hope this isn't a hi-jack offence). Probably have a couple thugs show up and brake my knee caps, but what the heck here goes...I've asked the question below several time, but just get the run around...
The factory has "C" rated tires on my tt and I've been told to run max 50 PSI in them. In the near future I will be replacing them. I would like to buy MAXXIS, but MAXXIS does not make "C" rated tires in ST225/75R15 just in "D" rated. Why can't I run "D"'s at 50 PSI and it be no different than my existing "C"s? Looks like 8 plys would be a lot safer/better than 6 plys. I monitor temp and psi all the time with my tireminders. When the weather gets better I will be hitting the CAT scales and find out my exact weight.

[kentnjudy]

Can't see any reason for not replacing C' with D's. Should have a higher load rating too.