What does ST mean on tires?

[SanCaroline]

ST stands for trailer tires. In Europe and America, private cars often tow a trailer for transporting goods or traveling, and ST indicates the tires used for such trailers. ST is the abbreviation for sport trailer. Based on their structural composition, pneumatic tires can be divided into two types: tube tires and tubeless tires. Passenger cars commonly use tubeless tires. Depending on the arrangement of the internal cord plies and cushion layers, tires can also be categorized into radial tires and bias-ply tires. Radial tires are widely used in automobiles. Trailer tire specifications: Automobile tires can be classified into pneumatic tires and solid tires based on their carcass structure. Most modern vehicles use pneumatic tires. According to the internal air pressure, pneumatic tires can be divided into high-pressure tires, low-pressure tires, and ultra-low-pressure tires. Low-pressure tires are commonly used in various types of vehicles.