The boat trailer tire pressure is very important so you can tow your boat safely on the road. Although it’s very important, it often gets overlooked. By checking your tire pressure before you head out on the open road you are making sure that you are not going to be a potential safety hazard and endanger many people. It’s also the correct and responsible thing to do before you leave for a long trip. Here are a few things you need to take into consideration before you leave for your adventure.

Boat Trailer Tire Pressure

Boat trailer tires demand a high level of air pressure. When inflating your tire, the pressure gauge should show between 50 and 65 psi. In reality, the proper tire pressure for your boat trailer is nearly always the maximum-rated pressure for that specific tire, which is molded directly onto the sidewall. Maintaining proper trailer tire psi and tire inflation is crucial for hauling safely. Otherwise, the trailer may cause problems for the passenger car.

Tire pressure affects how much weight a tire can safely bear. The trailer’s load carrying capacity is calculated using that exact tire pressure as a consideration. If you pull your boat out of the driveway with less than the maximum pressure in the trailer tires, you have essentially lowered the trailer’s weight capability. Underinflated and consequently overloaded trailer tires are the main cause of tire failure; the tires overheat and come apart.

Are The Tires Made For Trailers

The sidewall of a tire reveals everything: size, capacity, age, and, most importantly, function. A boat trailer tire will feature the letters “ST” or the phrase “Trailer Use Only” on the sidewall. Special trailer tires, unlike vehicle tires, have reinforced sidewalls to withstand the weight of a boat, particularly while rounding curves.

Bias ply or radial is the choice you have of trailer tires. Bias-ply tire sidewalls are stiffer and less costly than radials, and they are recommended if the trailer will not be utilized for long distances. Radials are a much better option for lengthy journeys since they have less heat accumulation than bias ply, a higher load capacity, and less road noise. Use just bias ply or radials; never combine the two.

Tire Wear

When anything is wrong with your tires, they will typically offer you many different clues before becoming the subject of discussion. Too much tire pressure produces wear in the middle of the tire, whereas too little tire pressure causes wear on the outer edges. You can easily inspect this before every journey by checking your tires to make sure you are as safe as possible.

Load Range

Trailer tires, like any other tire, have a load range. The load range is marked on the sidewall and ranges from the lowest weight the tire can bear to the heaviest. Load range is a measurement of a tire’s maximum ability to transport a boat and trailer. The load range of most boat trailer tires is B, C, or D. A tire with load range C can handle 1,820 pounds. If it is a single axle trailer, it means that the tires will be able to support 3,640 pounds of total weight which also includes the weight of the trailer itself, the boat, gasoline, engine, and anything else on the boat. Single-axle trailers may carry the full load rating. Loads must be decreased by 12% for double-axle trailers. Psi rises as the load range expands.


The tread depth of automobile and boat trailer tires may be measured using a Lincoln penny. Place the penny on the tread upside down. If you can see the top of the president’s head through the tread, it’s time to start searching for new tires.


Examine the sidewalls for spiderweb fractures, which indicate dry rot. If you find this on your tires you need to change them as soon as possible to make sure you are not left stranded on the side of the road with a flat tire.

Valve Stem

The valve stem, which is often ignored, may be the source of persistently low tire pressure. Listen for any loss of air by pressing your finger on one side of the stem. If you feel like air is escaping, act fast to prevent any dangerous situations on the road. Make sure you plug the leak if you know how to yourself or get new tires as soon as possible.

Setting the recommended boat trailer tire pressure is one of the most important things you need to do before heading out. Applying all of the practices above will ensure that you are as safe as you can be on the road when towing your boat. Make sure you check everything on our list above to maximize your safety and the safety of other motorists on the road.