Dumb iron

A dumb iron is a "curved side piece of a chassis, to which the front springs are attached."^[1]

Dumb irons are the downward-curving "horns" forming the front ends of the chassis side-rails

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Dumb irons are mainly featured on vehicles built before 1950, which had their front axle suspended on leaf springs. At the front of the car, dumb irons project forward, providing a location to attach the front of the leaf springs; The modern alternative is a suspension mount.