Wider tires = more road resistance = more power required to pull = lower MPG while towing. Looking for car tire sizes, check here Is a wider tire better on a trailer? Especially using a trailer tire on your car, or a car tire on your trailer, could lead to serious accidents. Can I use car tires on a trailer?ĭon’t use car tires on trailers. Trailer tires and car tires have different structures to work with different loads. In the case of a 225/75R15, the tire is roughly 9 inches wide, 28 inches tall and mounts on a 15 inch rim. 15 is the size of the rim this tire mounts on. 75 is the height of the sidewall represented as a percentage of the tread width. 225 is the width of the tread in millimeters. ST stands for special trailer and indicates that this tire is designed to be used on a trailer. E – 10 Ply Rating, 80 psi (550 kPa) Load Range Ply Pressure B 4 35 psi (240 kPa) C 6 50 psi (350 kPa) D 8 65 psi (450 kPa) E 10 80 psi (550 kPa) What is the most common trailer tire size?Ī common trailer tire size is ST225/75R15, commonly used for travel trailers, boat trailers, pop-up campers and all high-load carrying trailers including utility.
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That tells the maximum weight load tire can handle at its full rated PSI pressure. Each letter correlates to the ply rating (a number of tire plies) and load pressure (in psi units) for each ST and LT tire. The appropriate load range is represented by a letter within each tire size – B, C, D, and E. Trailer Load Range ChartĮach Special Trailer (ST) service tire has a rated load range. For example, if the tire size is 4.80 X 12B, then you know the section width is 4.80 inches. Numeric: The first set of numbers identifies the section width in inches.
For example, if a tire’s size was ST 175/80-R13 LRD, the 175 identifies the section width as 175 millimeters. This number designates the width of the tire in millimeters.
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