TIme to replace tires... Radial or Bias?

JIMNLIN wrote:
The Kumho 857 is a all position tire. This from Kumho 857 website.

RADIAL 857

TREAD CODE: 857

The Radial 857 is available in European-metric commercial sizes. The 857's primary application is to be mounted on a trailer. With its solid commercial construction, the 857 provides the durability and reliability you need from a trailer tire.

and farther reading says;

SPECIAL FEATURES
>For commercial light truck, transporter, van and trailer.
>Deep zigzag grooves for increased mileage.
>Straight center groove and sipes on four ribs to improve ride and noise.

IMO Kumho knows the USA doesn't have small vans/trucks/transporters with 14" tires and wheels like we see in other parts of the world but they do realize a need for a good 14" tire for trailer use here in the states. I'm guessing its all in how there marketed.

Edit; looks like photos beat me to the point....jim

Jim,
I think you nailed it exactly. Kumho has seen there is a need in the marketplace for a quality tire in 14" rim diameter in North America, so they have decided to bring the 857 here and market it as suitable for trailer use. My personal experience has been that changing out ST tires to LT tires on all four of my trailers, has ( knock wood ! ) eliminated the tire problems we previously suffered with various ST tires.
The set of 857's on my travel trailer are providing good service for me so far.

Also, as a side note, this travel trailer came with LR C, ST tires from the factory. These LR D 857's allow the trailer to tow in a more stable manner. This could very well be simply the fact that they are running at 65psi as compared to the ST tires that were at 50 psi. In other words, had I gone to a LR D, ST tire, I might have seen a similar improvement in towing stability.
I wanted to get completely away from the ST tire though, so I chose the LT 857. Works well, and has a much higher speed rating, giving me more "reserve" capacity in that regard, as well as since I went up a LR, I also improved my reserve load capacity. So, to repeat that, I have greater load capacity, and greater speed rating. All this in a tire that only cost a few dollars more than a ST. It was an easy choice for me to make.