Posted by: Mark Polk | 9:07 pm

RV DIY Q&A – ST Tires for Trailer Applications

rv Trip preparationQuestion: I am confused about what type of tires to put on my travel trailer. Some folks tell me to use LT tires and others say to use ST tires. Can you help clear this issue up?

Mark’s Answer: This is one of those controversial topics that people tend to disagree on, but I can offer some basic information to give you a better understanding of the topic and hopefully help you make an informed buying decision.

Tire manufacturers use designations like ‘P’ and ‘LT’ to identify the type of vehicle a tire is intended to be used on.  As a very basic explanation (there is more to it) the prefix letters on a tire like ‘P’ and ‘LT’ represent tires designed primarily for ‘passenger’ and ‘light truck’ service. Vehicles are designed for different uses and based on this require tires constructed for the intended use.

Trailers, like other vehicles, have their own set of requirements when it comes to tires.

ST tire designation: ‘ST’ stands for ‘Special Trailer’ tire. ST tires are designed for use on trailer axle positions only. They are not designed for the load or traction requirements of a drive or steering axle on other vehicles.  ST tires have strengthened sidewalls to prevent the tire from rolling under the rim in turns and when cornering. All ST tires have a maximum speed rating of 65 mph.  ST tires feature materials and construction designed to meet the higher load requirements and demands trailer towing presents.

As I mentioned earlier there is much more involved with this discussion, but that is the basic difference between ST tires and P or LT tires. For more information check out my article titled, Trailer Towing ST Tires Vs. LT Tires.

Happy RV Learning,

Mark Polk

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