15" Aluminum Type T03 Black Trailer Wheel. The exact size is 15" x 6" 6 lug on 5.5" / 139.7mm bolt pattern. Center hole diameter is 4.25 inches. Max load is 2830 Lbs per wheel. Zero Offset. This listing is for the wheel only. Most common tire sizes mounted on this wheel are 205/75R15, 205/75D15 (F78-15), 225/75D15 (H78-15) and 225/75R15. If ordering center caps the size you would need is 4.25 inches.