In an earlier article, we discussed the information seen on the sidewall of a typical trailer tire.  We mentioned the two basic types of trailer tires and their differences in their suitability and the importance of properly inflated tires.  To reiterate, properly inflated tires are very important for trailers because you really do not want to get a flat trailer tire while carrying a heavy load.  In the event that happens though, using Ready Jack for Trailers will have you on your back on your way in minutes.  In this article, we are discussing Trailer Tire Load Range and Trailer Tire Pressure:

Trailer Tire Load Range

All tires, from passenger, to trucks and heavy equipment, have a load range and trailer tires have them as well.  To find the load range of your trailer tire, look at the sidewall and on there you will find the lowest and highest end of the load ranges.  You will find a Load Range value of either B, C, D, or E. Load Range B is the lightest load the tire can carry and Load Range E is the heaviest load it can carry.  On trailer tires, the load range relates to the highest measure of weight of a boat and trailer that it can carry.

Generally speaking, trailer tires have a Load Range of either B,C, or D. For example, a trailer tire with a load range C can hold 1,820 pounds.  This means that if you are hauling a boat on a trailer with a single axle (meaning two tires are carrying the weight) then the total load capacity is 3,640 pounds* (check the load rating of your tire’s manufacturer).  Keep in mind that this number includes total weight, not just the boat or the load you are hauling.  So, this includes the trailer, the boat, the engine, gas in the gas tank and anything else that is on-board.

If you are hauling a trailer with two axles, things change a bit.  You see, single axle trailer tires can carry 100% of the load rating.  So, if your trailer tires have a load range of C, then they can safely carry 3,640 pounds (depending on the tire manufacturer’s specifications).  On a double axle trailer, you need to decrease the load range by 12%.  This means that if you are using trailer tires with a load range of C on a double axle trailer, then the maximum load range is 6,406 pounds.  Additionally,  the psi of the tires goes up as the load range increases.  Check your tire’s manufacturer  specifications to determine the proper psi for the different load ranges.

Trailer Tire Wear

Just as with other types of tires, the wear on the tire can tell you a lot about the condition of the tire.  As a rule of thumb, it is a good idea to regularly check the condition of your trailer tires because they can indicate upcoming tire failure.  You’ll want to to take care of this in advance because the last thing anyone wants is to get a flat tire while on the road carrying a heavy load. Improperly inflated tires can cause uneven wear.

Trailer tires that are under-inflated will show more wear on the outside edges of the tires.  Additionally, under-inflated tires  get hotter while on the road which also leads to unwanted tire failure.  Over inflated tires will also result in uneven wear on the tires.  These tires will show more wear on the center of the tire.  Tires that are over-inflated can also lead to a flat tire, so it is important to always keep the tires properly inflated.  All it takes is a quick check with a tire pressure gauge.