This is a heavy remix of AngrySquirrel's "RC4WD Steel Wheel for WPL 1/16 RC truck" wheel. The OEM WPL wheels weigh about 5.7grams. His design if printed at 100% infill comes out at double that. This design will add a few more grams, making the wheels quite heavy. No need for lead or copper wire.
All I did was make the valley in the center solid.
Print at 100% infill for a heavy wheel.