Find an ST225 75R15 trailer tire for your next replacement or spare at Tractor Supply. Browse tires in this size, then check your trailer’s requirements for load range, weight capacity and wheel fit before choosing. Matching the size alone isn’t enough—make sure the tire is rated for the load you plan to haul.

An ST225 75R15 trailer tire is a special trailer tire size you may find on utility trailers, livestock trailers, boat trailers and travel trailers. Whether you’re hauling feed out to the barn or getting a camper ready for a weekend away, understanding the ST225/75R15 tire size helps you narrow down the right replacement. The “ST” stands for Special Trailer, meaning the tire is intended for trailer service rather than a tow vehicle’s steering or drive axle. The “225” indicates a nominal tire width of 225 millimeters, while “75” means the sidewall height is 75 percent of that width. The “R” identifies radial construction, and “15” indicates that the tire fits a 15-inch-diameter wheel. That wheel diameter alone doesn’t confirm fit, though. Before choosing replacement trailer tires, check your trailer’s tire information label and owner’s manual for the specified size, load capacity and inflation pressure. Wheel width, wheel load and pressure ratings, and clearance around the tire also need to match the application. Choosing an ST225 75R15 radial trailer tire also means looking beyond size to its load range, maximum load capacity and speed rating. Tires with the same size marking can carry different load ratings, so don’t assume every ST225/75R15 trailer tire can handle the same job. Select tires that meet the trailer manufacturer’s requirements, and remember that installing tires with a higher load capacity does not increase the trailer’s gross vehicle weight rating or axle ratings. Your loaded trailer weight includes the trailer itself along with livestock, equipment, supplies or other cargo, and uneven loading can put extra weight on individual tires. Before heading down the road, check cold tire pressure with a tire pressure gauge and follow the trailer manufacturer’s inflation guidance without exceeding tire or wheel limits. Inspect the tread and sidewalls for cuts, cracks, bulges and uneven wear, and check the tire’s date code alongside the manufacturer’s age-related replacement guidance. Keeping compatible tires on the same axle and carrying a properly rated spare trailer tire can help you stay prepared for hauling days, whether the route runs across town or out to the next county.

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