15" Aluminum Type 08 (Split Spoke) Trailer Wheel. The exact size is 15" x 6" 5 lug on 4.5" bolt pattern. Center hole diameter is 3.25 inches. Max load is 2150 Lbs per wheel. 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 3.25 inches.