Martin Wheel R-84 4-Hole Steel Trailer Wheel (8x3.75" / 4x4") Exceeds DOT requirements for highway use. Best replacement wheel for utiltiy, RV and boat trailers. Fits tire sizes: (480-8); (570-8) Powder-coat finish resists chipping, scratching, fading and corrosion for a great appearance and longer life. Max Load: 910 pounds at 75psi Valve stem sold separately. For valve stems, see Part #TR-413-2PAK: Martin Wheel TR-413 Valve Stem 2 Pack