Martin Wheel R-124S-G 4-Hole Galvanized Steel Trailer Wheel (12X4") Exceeds DOT requirements for highway use. Best replacement wheel for utiltiy, RV and boat trailers. Fits tire sizes: (480-12); (530-12) Double electro-zinc galvanized plated for best service in salt water or coastal conditions Max Load: 1045 pounds at 90psi Valve stem sold separately. For valve stems, see Part #TR-413-2PAK: Martin Wheel TR-413 Valve Stem 2 Pack