How Are Your Horse Trailer Tires?

Two recent events gave me the thought to write this article:

One - I blew out a trailer tire coming home from an event and when I took the tire and rim into be be changed out, I noticed that the tire was 8 years old. I thought that the oldest tire I had on that trailer may have been 5 years old, but I was wrong, and.....


Two - A friend of mine who sometime trail rides with my wife and me, but mainly competes in dressage where she has to trailer quite a ways to events asked me to look at her trailer tires to see if I thought she was safe until she had a chance to replace the tires. She mentioned that the tires still looked good, but someone had told her she needed to replace them. 

I think it's probably pretty common to people to run tires way beyond their life span and to under-inflate those tires as well. Both risk a blow out, and when one tire blows out it places more stress on the other tire, then you have a potentially bad accident.

Most people are going to have trailers tires that have outlived their life span before they run the tread down where it's becomes obvious that the tire is old and needs replacing. The sun, heat, rain and snow plus the pressure of the trailer's weight all degrade that tire over time, particularly on the sidewalls.

Tire pressure should be checked when the tire is cold. Just because the tire pressure was good last week doesn't mean that they have retained their pressure today.....there are just some mysteries that won't be answered until we meet our Maker,....how come you put three pair of socks in the dryer and only get five socks back,....how come vampires don't like garlic,....and why a perfectly good tire without any holes in it loses air.

Use a tire gauge to check pressure. If you routinely trailer horses then setting up a permanent air station to make it easier to top off air in your tires sure makes a difference. Under inflated tires hampers handling and decreases tire life. Don't forget to check your spare tires as well.

Probably another common practice is to put passenger tires on the trailer as opposed to trailer tires. The difference being that passenger tires have more flexible sidewalls that can increase trailer sway. Trailer tires have stiffer sidewalls to help reduce sway. Most tire experts will tell you not to use passenger or light truck tires on a horse trailer.

When it comes to choosing a bias or radial tire how you use the trailer will help you decide. I use bias ply tires as they are intended for rougher terrain and generally have thicker side walls to help against punctures from cactus, mesquite thorns and sharp rocks. I have blown two bias ply tires on my horse trailer in one day,...several times as a matter of fact,....so I always carried two spares and sometimes I threw a third spare into then bed of my truck when my spidey sense told me to.

Radial tires are recommended for mostly paved road travel at higher speeds and when you trailer many miles and tread wear is important to you.

How to Read a Tire: 

What ST225/75D15 means:

ST
Type of Tire: P = Passenger, LT is Light Truck, ST is for Special Trailer

225
Tire Width, sidewall to sidewall in millimeters

75
This percentage compares the tires section height with the tires section width. For example, this aspect ratio of 75 means that the tires section height is 75% of the tires section width.

D
Indicates the construction used within the tires casing. R stands for radial construction. B means belted bias and D stands for diagonal bias construction.

15
Diameter of the wheel in inches


What DOT 6WVX 3410 means:

DOT (certifies the tire manufacturer’s compliance with U.S. Department of Transportation tire safety standards

6WVX (Manufacturer’s Code, tire size and tire code optional)

3410 (Date of Tire Manufacture - 3410 = 34th week of 2010)

So take a look at your trailer tires.  May attention to the date of manufacturer and if your tires are 4 or 5 years old, chances are you'll want to consider changing them.  Safe Trailering is essential to a Safe Journey.