On 6/1/2010 8:56 PM, Greg Arnold wrote:
On 6/1/2010 8:46 PM, Eric Greenwell wrote:
On 6/1/2010 9:29 AM, Andy wrote:
On May 31, 8:47 pm, Eric wrote:

The Yokohama tire you list is a LT (light truck) tire. Does Yokohama
have a trailer rating for it in addition to the LT rating?
Don't know. Maybe the dealer lied to me. I asked for trailer rated
tires and he told me they were. They were not a stock item he needed
to move, they were ordered from the Yokohama warehouse. Normally I
do a lot of research on something like this but I was distracted by
other things and just needed to get it done.. Anyway they seem to
work just fine so far.

LT tires are a good match for trailers (better than P type - passenger
car tires - for the same size and speed rating)

Why are they better?
Here's what I wrote for the ASH 26 E owners "tech site":

Commonly available tire types are P (passenger car), LT (light truck)
and ST (special trailer). While each tire series shares basic
construction methods, the details vary meaningfully among the three.

There are other differences:

1. P tires use a load rating system that is different from ST and LT
tires; generally, you have to discount their rating 10% to get the
equivalent ST or LT rating.
2. ST tires speed rating is 65 mph. The speed rating increases to 75
mph IF you increase the tire pressure to 10 psi above the pressure
required for your load at 65 mph. These are not the tires for
folks that like to drive 80 mph across the Nevada highways in 100
deg F temperatures.
3. ST tires come in both bias-belted and radial construction. The
only advantage to a bias-belted trailer tire is it's cheaper.
4. LT tires are a bit "stiffer" than either P or ST tires, and are
available in speed ratings to at least 118 mph.

Suggestions:

1. P tires might work fine, but I don't know what speed and load
ratings would ensure this. If I decided to use P tires, I'd use
them at the pressure that gave a load rating of ~40% more load
rating than the load they has to carry. I'd choose a speed rating
at least 20 mph higher than the speed rating on my tow vehicles
tires.
2. If you like the way the trailer tows, staying with the same make
and model of tire means no surprises. The same type and size tire
from an equally trusted manufacturer is probably good, too.
3. If you like to tow faster than 70, don't use ST tires; instead,
get an LT tire rated at least 20 mph more than your intended tow
speed.

This web page has more information on trailer tire safety, written by
Tom Wilson for Trailer Life magazine in 2002:
https://www.subaru.com/my-subaru/tire-safety.html
http://www.google.com/url?q=https%3A%2F%2Fwww.subaru.com%2Fmy-subaru%2Ftire-safety.html&sa=D&sntz=1&usg=AFrqEzfNgJTx0_JddUB7NR 7ejOvGSR2NYw


--

Eric Greenwell - Washington State, USA (netto to net to email me)

- "Transponders in Sailplanes - Feb/2010" also ADS-B, PCAS, Flarm http://tinyurl.com/yb3xywl

- "A Guide to Self-launching Sailplane Operation Mar/2004" Much of what you need to know tinyurl.com/yfs7tnz