Towing speed - Page 3 - Fiberglass RV


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Old 06-04-2012, 10:54 PM   #29
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The speed rating of Kumho 857, Maxxis UE 168, and Hankook RA 08 is "Q". That rating is 99 mph or 160 km/hr. All three tires are sold for trailer use but are not ST tires. They are foreign commercial truck tires. I have Kumho 857 tires on my Bigfoot but never drive over 65 mph.
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Old 06-04-2012, 10:57 PM   #30
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Originally Posted by Frederick L. Simson View Post
Am I missing something here?

ALL of the 18 wheelers pass me, and I'm OK with that. The only people I pass are the 86 year old great-grandmas who can barely see over the steering wheel.

I have no patience - when I am going somewhere I wanna get there, ASAP!

I was disappointed that I could not find (on this site)any reference to the Kumho 857 trailer tires that are rated to 100 mph - they have been mentioned and recommended by members, but unless you specifically search for "Kumho 857", you won't find them - and if you knew to do that, you wouldn't have to!

By the time I found about them, it was too late - I had already spent a ton of $$$ on a new set of tires that are still rated to only 65 mph - but I had to replace the one year old Marathons that seemed to love going "blooie".

I'd love to know who are the moderators (Yes Frederick, I know you are one, but you are the only one I know of) so I could PM all of them with a suggestion to establish a "products recommended by members" section. I'd even volunteer to be the moderator of it!
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Old 06-04-2012, 11:55 PM   #31
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Originally Posted by BCDave View Post
I have no patience - when I am going somewhere I wanna get there, ASAP!

I was disappointed that I could not find (on this site)any reference to the Kumho 857 trailer tires that are rated to 100 mph - they have been mentioned and recommended by members, but unless you specifically search for "Kumho 857", you won't find them - and if you knew to do that, you wouldn't have to!

By the time I found about them, it was too late - I had already spent a ton of $$$ on a new set of tires that are still rated to only 65 mph - but I had to replace the one year old Marathons that seemed to love going "blooie".

I'd love to know who are the moderators (Yes Frederick, I know you are one, but you are the only one I know of) so I could PM all of them with a suggestion to establish a "products recommended by members" section. I'd even volunteer to be the moderator of it!
According to the Kumho web sit those tires are rated for an RPM of 817. When you calculate that it comes slightly less than 65 mph. Unless you have some other information those tires are rated for the same maximum as all other ST tires.
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Old 06-05-2012, 12:35 AM   #32
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Originally Posted by Byron Kinnaman View Post

According to the Kumho web sit those tires are rated for an RPM of 817. When you calculate that it comes slightly less than 65 mph. Unless you have some other information those tires are rated for the same maximum as all other ST tires.

And yet they are "Q" speed rated - which comes to just about 100 mph!

On edit: The RPM on a tire spec chart is for purposes of speedometer calibration and refers to tire revolutions per MILE (not per minute) and is thus reflective of the tire's rolling diameter under load. It is NOT related in any manner to speed ratings!

I have no objections to getting away from a specific ST rating - perhaps maybe even going to tires that just might (here's a radical idea!) stay intact while going down the road at 60 mph, inflated to max and carrying way less than rated load! If they could do that for a year after purchase that'd beat the whee out of my experience to date with the ST rated Marathons!

I never had a problem with trailer tires until I started running ST rating tires - since then I have nothing but expen$ive grief!

Here is what I find on the Kumho website:



RADIAL 857



TRAILER TIRE

The 857 with it's solid commercial construction provides the durability and reliability you need from a trailer tire.
SPECIAL FEATURES

  • Radial tires for commercial light truck, transporter, van and trailer.
  • Deep zigzag grooves for increased mileage and traction.
  • Straight center groove and sipes on four ribs to improve ride and noise.
They say a "typical competitor tire is the Goodyear Marathon"


In their chart on tire specs they show it as UTQG rated (whatever that means) and searching further I find :


The Radial 857 is KUMHO's Euro-metric Commercial-sized special purpose tire designed for use on trailers. Radial 857 tires are not intended to be used on cars or light trucks.
On the outside, the Radial 857 features a 4-rib design to provide constant rubber-to-road contact that delivers dependable highway stability, traction and durability. Internally, the Radial 857 features twin steel belts that stabilize the tread to increase traction, while a 2-ply, polyester cord body helps even out the trailer's ride.
KUMHO Radial 857 tires feature blackwall styling and are available in Q-speed rated 82-series, Load Range D (65 psi) Euro-metric Commercial sizes for 14" wheel diameters.
Special purpose trailer tires are not UTQG rated.
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Old 06-05-2012, 12:36 AM   #33
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Originally Posted by Donna D. View Post
I'm cheap... I admit it. I figured out a loooong time ago, that I can't spend the same nickle twice. Fuel is EXPENSIVE on the west coast. Paid over $81 to fill my truck yesterday, and that will get me on the road for six business days. Sigh.

So... when pulling the trailer I travel 55-60mph and have found out that (typically) the truck gets the best MPG at 57 mph. I try to keep as much money in my pocket as I can for transportation costs, so I can spend it on other things.
I too have seen a significant difference in gas mileage between 57/58 and 65. On a recent trip to LA the difference was 3mpg Of course every rig will have it's own sweet spot and there are many variables that figure in.
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Old 06-05-2012, 12:44 AM   #34
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Quote:
Originally Posted by BCDave View Post
And yet they are "Q" speed rated - which comes to just about 100 mph!

I have no objections to getting away from a specific ST rating - perhaps maybe even going to tires that just might (here's a radical idea!) stay intact while going down the road at 60 mph, inflated to max and carrying way less than rated load! If they could do that for a year after purchase that'd beat the whee out of my experience to date with the ST rated Marathons!

I never had a problem with trailer tires until I started running ST rating tires - since then I have nothing but expen$ive grief!

Here is what I find on the Kumho websit



RADIAL 857



TRAILER TIRE

The 857 with it's solid commercial construction provides the durability and reliability you need from a trailer tire.
SPECIAL FEATURES

  • Radial tires for commercial light truck, transporter, van and trailer.
  • Deep zigzag grooves for increased mileage and traction.
  • Straight center groove and sipes on four ribs to improve ride and noise.
They say a "typical competitor tire is the Goodyear Marathon"


In their chart on tire specs they show it as UTQG rated (whatever that means) and searching further I find :


The Radial 857 is KUMHO's Euro-metric Commercial-sized special purpose tire designed for use on trailers. Radial 857 tires are not intended to be used on cars or light trucks.
On the outside, the Radial 857 features a 4-rib design to provide constant rubber-to-road contact that delivers dependable highway stability, traction and durability. Internally, the Radial 857 features twin steel belts that stabilize the tread to increase traction, while a 2-ply, polyester cord body helps even out the trailer's ride.
KUMHO Radial 857 tires feature blackwall styling and are available in Q-speed rated 82-series, Load Range D (65 psi) Euro-metric Commercial sizes for 14" wheel diameters.
Special purpose trailer tires are not UTQG rated.

Here's what I found.

No matter what the tire rating is it's still a good idea to slow down. You're going to have a heart attack if you don't learn how to relax and slow, that is if don't crash and die first.
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Old 06-05-2012, 04:51 AM   #35
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Originally Posted by Frederick L. Simson View Post
The only people I pass are the 86 year old great-grandmas who can barely see over the steering wheel.
Except in the Pasadena area, I assume....?
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Old 06-05-2012, 06:28 AM   #36
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Old 06-05-2012, 06:57 AM   #37
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Tire Rack lists four sizes of Kumho 857 tires. They show two rated as "Q" speed rated at 99 mph, and two at "R" speed rating at 106 mph.
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Old 06-05-2012, 07:37 AM   #38
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It does not appear that any of the Kumho tires will fit a 13" rim.
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Old 06-05-2012, 07:38 AM   #39
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Name: george
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Originally Posted by Ray N View Post
Tire Rack lists four sizes of Kumho 857 tires. They show two rated as "Q" speed rated at 99 mph, and two at "R" speed rating at 106 mph.
"R" is a light truck speed rating, and "Q" is a winter tire car rating.
What I find interesting is that tirerack states the tire is trailer specific, but when I look on the Kumho factory site, they state the tire is suitable for both light truck and trailer use. I would be more inclined to go by what the factory says, and not the retailer.
All indications are it is a good tire for our trailers, based on all the reading and research I have found. It's on my short list of three different tires, the others being the Maxxis 8008 and the Hankook RA08
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Old 06-05-2012, 09:46 AM   #40
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My Kumho tires are stamped "8 P.R." any idea what that means? Perhaps ply rating?
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Old 06-05-2012, 09:51 AM   #41
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Does anyone know what makes a tire "trailer specific"? The only thing I have heard (unsubstantiated) is that 5th wheel tires need to resist the side loads imparted by severe jack knife turns. I'm not sure I buy that given the side loads on a truck tire while turning at speed. My experience with trailer tires seems to indicate that "trailer specific" simply means an inferior tire that should not be used on a car/truck.
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Old 06-05-2012, 10:55 AM   #42
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Quote:
Originally Posted by Frederick L. Simson View Post
The only people I pass are the 86 year old great-grandmas who can barely see over the steering wheel.
Quote:
Originally Posted by Andrew Gibbens View Post
Except in the Pasadena area, I assume....?
Quote:
Originally Posted by BCDave View Post
In a "brand New, Shiny-Red Super Stock Dodge?"
Jan & Dean Little Old Lady From Pasadena - YouTube

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