What does st mean on a tire?
Tires beginning with a ST (for example ST175/80R13) indicate a Special Trailer tire and should only be used on car, boat or utility trailers. ST stands for special trailer and indicates that this tire is designed to be used on a trailer.ST stands for “special trailer tire. P or LT stands for “passenger” or “light truck” tire. Because of an ST tire’s heavier design, it is designated to carry more load than a P or LT tire. Tread patterns between the two are also specific to their applications. STs have an equal volume of air space.You are correct, the 205/70R15 tire is not a trailer tire. This tire is 26. Your 205/75D15 tire has an overall diameter of 27.ST205/75R15 Here’s what it means: ST – Special Trailer tire. Width of the tire in millimeters.
What does st 205 mean on a tire?
On a trailer tire labeled ST205/75D15 C, the ST stands for Special Trailer which means it is designed for use on boat and utility trailers. The 205 is the section width of the tire in millimeters. The 75 is the aspect ratio (or section height). The D in a tire size of ST205/75D15 stands for bias ply and if you see the letter R in the tire size where the D is, that is a Radial tire.The D in 75D15 stands for diagonal (or bias ply), indicating that the tire’s internal fabric layers are laid diagonally, whereas the R in 75R15 stands for radial, meaning the tire’s internal fabric layers run radially across the tire.ST205/75R15 Here’s what it means: ST – Special Trailer tire. Width of the tire in millimeters. Aspect ratio (height of the sidewall as a percentage of width) R – Radial construction.R stands for “Radial” and the last two figures 15 indicate the wheel diameter in inches. The size ends with the load index 88, which is the maximum weight that each wheel can support, and the speed rating H, which is the maximum speed at which the tyre is approved for use.The D in 75D15 stands for diagonal or bias ply, indicating that the tire’s internal fabric layers are diagonally arranged, while the R in 75R15 stands for radial, meaning that the tire’s internal fabric layers are arranged radially from the center.
How long are ST tires good for?
Special trailer tires (STs) are highly recommended by experts as their composition is built to support fifth wheel trailers and travel trailers. ST radial tires offer an even longer lifespan with some reportedly reaching up to 40,000 miles before needing replacement. Why LT Tires Don’t Belong on Boat Trailers. LT (Light Truck) tires are designed for SUVs, vans, and pickups. They perform well under mixed driving conditions, offering traction, handling, and ride comfort. But they lack the load-handling capacity and sidewall strength that a boat trailer demands.Special Trailer (ST) Trailer tires are developed specifically for use on travel trailers, pop-up campers, boat trailers and fifth wheel trailers. Designed to deliver on-highway service for towed trailers, ST-sized tires are not intended to be used on cars or light trucks.ST stands for “special trailer tire. P or LT stands for “passenger” or “light truck” tire. Because of an ST tire’s heavier design, it is designated to carry more load than a P or LT tire. Tread patterns between the two are also specific to their applications. STs have an equal volume of air space.ST and LT tires are not interchangeable. The stiffer sidewalls of tires for trailer use only are designed for larger loads, and there is a large possibility that light truck tires will fail under the same pressure. Additionally, trailer owners will have to face size/load range differences as well.
What does the ST stand for on trailer tires?
Special Trailer (ST) Trailer tires are developed specifically for use on travel trailers, pop-up campers, boat trailers and fifth wheel trailers. Designed to deliver on-highway service for towed trailers, ST-sized tires are not intended to be used on cars or light trucks. D tires are typically rated for a higher load capacity, making them ideal for heavy-duty trailers that carry substantial weight. On the other hand, R tires are generally designed for lighter loads and provide a smoother ride, which can be beneficial for recreational trailers.Load Range C: 6-ply rating, a common choice for medium-sized trailers. Load Range D: 8-ply rating, suitable for larger trailers or heavier loads. Load Range E: 10-ply rating, often used for heavy-duty trailers or commercial applications.
How long do ST tires last?
Most trailer tire manufacturers recommend replacing tires every 5 to 6 years, even if the tread still looks good. If the tires are showing signs of cracking, dry rot, or have been exposed to prolonged UV rays, they may need to be replaced even sooner. Light-use trailers: Up to 10,000–12,000 miles. Years Old: Even if your tires are properly maintained, they may reach the end of their service life at 6-10 years. Improperly maintained tires will likely have a shorter lifespan.We recommend replacing tires aged 6-10 years, no matter how much tread remains. When it comes to replacing tires, things can be a little unpredictable. Mileage, condition and routine maintenance all contribute to the tire’s safety and usability.