This article relies largely or entirely on a single source .(June 2025) |
A dumb iron is a "curved side piece of a chassis, to which the front springs are attached." [1]
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.