ST225/75R15 Trailer Tires

ST225/75R15 is the standard 15-inch tire for tandem-axle travel trailers, car haulers, enclosed cargo trailers and larger boat trailers. It is also written as 225/75R15, 225/75D15 or 225/75-15 and measures about 28.3 inches tall and 9 inches wide. The ST prefix means Special Trailer: a stiffer sidewall built for towing loads, not for a truck or SUV.

We carry it in load range D (8-ply, about 2,540 lbs per tire) and load range E (10-ply, about 2,830 lbs per tire), in radial (R) and bias-ply (D) construction, including the Goodyear Endurance. Match the load range on your current tire or the trailer's capacity sticker, and never go lower. Orders ship from the U.S. with tracking.

Common questions

D or E load range for my camper?
Most tandem-axle campers under 7,000 lbs ship on load range D. If your trailer is near its rated weight, or you tow long distances in summer heat, load range E runs cooler and adds margin. Both fit the same 15x6 wheel.

What bolt pattern wheel goes with it?
Usually 15x6 with a 6 on 5.5 bolt pattern. Some lighter trailers use 5 on 4.5. Count your lugs before ordering a wheel.

Do you sell it mounted?
Yes. See our ST225/75R15 tire and wheel assemblies, balanced and inflated, in load range D, E and G.