RVUSA wrote: 106 mph is a number. But it indicates the amount of heat that can be tolerated as the tire rotates, and goes from being unloaded to fully loaded with the weight it's carrying. The bulge at the bottom, right?
Bias ply tires really dont like doing that. If you drive 60 with bias ply tires, you are running them at their extreme end of tolerance. Radials are much better at the loading/unloading cycle and dont heat up as much.
It's the heat that makes everything come unglued as it were. A tire rated to withstand the heat generated at 106 mph "fully loaded", is most likely going to work more reliably at 60 than a bias ply tire that's max rated for 60. The bias ply tire is pretty much cooking itself to death.
That was my exact thinking when I gambled on this new set of Carlisles with the R (106 mph) rating.
Lyle
2002 GMC Sierra 2500 HD Duramax Crew Cab 4x4
Banks Bullet Tuner and Monster Exhaust
B&W Turnover Ball with 5th Wheel Companion
2004 Komfort 25FSG Fifth Wheel
1936 John Deere Model A
International Flying Farmers 55 Year Member
RVUSA wrote: 106 mph is a number. But it indicates the amount of heat that can be tolerated as the tire rotates, and goes from being unloaded to fully loaded with the weight it's carrying. The bulge at the bottom, right?
Bias ply tires really dont like doing that. If you drive 60 with bias ply tires, you are running them at their extreme end of tolerance. Radials are much better at the loading/unloading cycle and dont heat up as much.
It's the heat that makes everything come unglued as it were. A tire rated to withstand the heat generated at 106 mph "fully loaded", is most likely going to work more reliably at 60 than a bias ply tire that's max rated for 60. The bias ply tire is pretty much cooking itself to death.
That was my exact thinking when I gambled on this new set of Carlisles with the R (106 mph) rating.
Lyle
So I just talked to Carlisle and..... It is not a R(106). She said and it says on the web page "RADIAL TRAIL is approved for Highway Speed Use" She said whatever the speed limit is, that is what they are approved for. Looks like a lot of wiggle room on either side! Would be interesting what the sidewall says??
* This post was
edited 05/03/12 02:49pm by Snow_King *
Somewhere in a Fifth Wheel - Where it does not Snow
I just looked, nothing on the tire itself. I remember one post stating it was an R, and then seeing all the dealers like discount tire and such having that speed rating. Maybe they just kind of fudged it based on the highway rated statement? Dunno, but I will have to stop repeating it.
I have almost 8K on mine and that's from pulling from orlando to LA, ca. and then to PA. Probably almost all of it was at 65 - 68. My sample set of 4 new tires has been great, but definitely not enough data to draw anything from it. It's my first 5th wheel after 3 class A's so that makes it even less useful. *sigh*
RVUSA wrote: I just looked, nothing on the tire itself. I remember one post stating it was an R, and then seeing all the dealers like discount tire and such having that speed rating. Maybe they just kind of fudged it based on the highway rated statement? Dunno, but I will have to stop repeating it.
I have almost 8K on mine and that's from pulling from orlando to LA, ca. and then to PA. Probably almost all of it was at 65 - 68. My sample set of 4 new tires has been great, but definitely not enough data to draw anything from it. It's my first 5th wheel after 3 class A's so that makes it even less useful. *sigh*
If it is a speed rated tire then it should have a "Service Discription". Two or three numbers and a letter, mostly likely following the size branding. A poster named Tireman9 covered this a while back I believe. If it is truely is a R rated tire, then that will be molded in the sidewall somewhere, with number ahead of that indicating weight rating. I do not believe that any ST tire has a service discription, as they do not follow industry standards.
Our SUV shows 105S. 2039 pounds and 112 MPH.
Truck is 123R. 3415 pounds and 106 MPH.
* This post was
edited 05/03/12 06:10pm by Snow_King *
RVUSA wrote: 106 mph is a number. But it indicates the amount of heat that can be tolerated as the tire rotates, and goes from being unloaded to fully loaded with the weight it's carrying. The bulge at the bottom, right?
Bias ply tires really dont like doing that. If you drive 60 with bias ply tires, you are running them at their extreme end of tolerance. Radials are much better at the loading/unloading cycle and dont heat up as much.
It's the heat that makes everything come unglued as it were. A tire rated to withstand the heat generated at 106 mph "fully loaded", is most likely going to work more reliably at 60 than a bias ply tire that's max rated for 60. The bias ply tire is pretty much cooking itself to death.
That was my exact thinking when I gambled on this new set of Carlisles with the R (106 mph) rating.
Lyle
So I just talked to Carlisle and..... It is not a R(106). She said and it says on the web page "RADIAL TRAIL is approved for Highway Speed Use" She said whatever the speed limit is, that is what they are approved for. Looks like a lot of wiggle room on either side! Would be interesting what the sidewall says??
Hmmm, I guess I'll have to double-check the tires next time I lay eyes on 'em. Discount lists them as R speed rated, which is what I based my decision on, in large part.
RVUSA wrote: I just looked, nothing on the tire itself. I remember one post stating it was an R, and then seeing all the dealers like discount tire and such having that speed rating. Maybe they just kind of fudged it based on the highway rated statement? Dunno, but I will have to stop repeating it.
I have almost 8K on mine and that's from pulling from orlando to LA, ca. and then to PA. Probably almost all of it was at 65 - 68. My sample set of 4 new tires has been great, but definitely not enough data to draw anything from it. It's my first 5th wheel after 3 class A's so that makes it even less useful. *sigh*
If it is a speed rated tire then it should have a "Service Discription". Two or three numbers and a letter, mostly likely following the size branding. A poster named Tireman9 covered this a while back I believe. If it is truely is a R rated tire, then that will be molded in the sidewall somewhere, with number ahead of that indicating weight rating. I do not believe that any ST tire has a service discription, as they do not follow industry standards.
Our SUV shows 105S. 2039 pounds and 112 MPH.
Truck is 123R. 3415 pounds and 106 MPH.
I'll look tomorrow and compare against the tires on the truck and post what I can find.
Transmasters here. 10k + miles and date codes from mid 2005.
They are the best ST tire I have ever owned.
I don't abuse my tires and the conditions here are very mild. I should replace them one of these years, but I just can't see doing it quite yet. They are in excellent condition still.
Steve
2006 Ford F350 6.0 PSD CC 4x4 LB, Bone Stock. B&W Turnover / Companion. Airlift Airbags 57291. Leveling Kit. RS9000 Shocks.
I just bought a 5th wheel 39' and the owner had just put on 6 new tires. Freestar 16" ST radials E load with a F-108 marking on them. How worried should I be?
In my life I've spent my money on women, booze, Harleys, guitars and traveling, the rest I just wasted...
2007 Ford F-350 diesel/dually & Sunnybrook Titan KSRV 39-1 Toy hauler 5th wheel hauling my custom Harley
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