Find ST205 75D15 trailer tires to match your trailer’s replacement needs. This size designates a bias-ply trailer tire for a 15-inch wheel. Before choosing, check your trailer manufacturer’s tire specifications and match the required size, load range and weight capacity.

ST205 75D15 trailer tires are worth a closer look if that’s the size listed for your trailer, whether you’re hauling supplies out to the pasture or taking equipment down the road. Often written as ST205/75D15, this tire size tells you several things about fit and construction. “ST” stands for Special Trailer, meaning the tire is designed for trailer service rather than a pickup or passenger vehicle. The “205” indicates a nominal section width of 205 millimeters, while “75” means the sidewall height is 75 percent of that width. The “D” identifies diagonal, or bias-ply, construction, and “15” specifies a 15-inch wheel diameter. Those details make a good starting point for choosing replacement trailer tires, but matching the size alone isn’t enough. Check your trailer’s tire information label and owner’s manual for the required tire size, load rating, and inflation guidance. Wheel width, wheel load capacity, and clearance around the fenders also matter, especially if you’re considering a change from the original setup. Choosing an ST205 75D15 tire also means matching its load capacity to the job ahead. Tires with the same size marking can have different load ranges, so check each tire’s listed capacity rather than assuming every ST205/75D15 trailer tire carries the same weight. Account for the trailer itself along with feed, fencing supplies, tools, or other cargo, and stay within the trailer’s axle ratings and gross vehicle weight rating. If you’re comparing ST205/75D15 bias-ply tires with ST205/75R15 radial trailer tires, remember that the construction differs; follow the trailer manufacturer’s recommendations and avoid mixing bias-ply and radial tires. Before heading out, check cold tire pressure against the trailer manufacturer’s guidance without exceeding tire or wheel limits. Look for sidewall cracks, bulges, uneven tread wear, and damage around the valve stems, and check the spare, too. Keeping the correct trailer tire size, load rating, inflation, and speed rating in mind helps you prepare for the miles between the farm, the supply store, and your next stop.

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