Black rubber on iron pairs a tough black rubber tread with a cast iron core — cushioned, quiet, shock-absorbing roll, backed by a core that carries up to 3,000 lb per wheel. It's the heavy-duty end of rubber: the ride quality of rubber without the capacity ceiling of a soft all-rubber wheel.
An all-rubber wheel rides soft but caps low and can flat-spot under sustained load. Bonding that rubber tread to a cast iron core changes the math: the iron carries the load (to 3,000 lb), the rubber still absorbs the shock, and the bond resists the delamination that kills cheaper rubber wheels. It's the construction for heavy carts that need to roll quiet and cushioned over rough floors and dock seams.
Heavy industrial carts on mixed or rough floors, outdoor-to-indoor transfer, equipment that crosses expansion joints and dock plates loaded. Anywhere you'd want rubber's ride but the load is too heavy for soft rubber and the floor is too rough for hard polyurethane.
Most black rubber compounds can leave marks on light floors. For strictly non-marking, confirm the compound or choose a gray non-marking tread.
Far less than soft all-rubber — the iron core holds the wheel's shape. Still, avoid parking loaded for very long stretches.
Rubber rides softer and absorbs more shock; polyurethane rolls easier and carries more. Pick rubber for ride, poly for capacity and efficiency.
Our US-based caster engineers will match the right build to your load, floor, and application.
Call 844-439-4335
