A control arm, commonly referred to as an A-arm, is a hinged suspension link used in automobile suspension that connects the chassis to the hub that supports the wheel. A control arm's inboard (chassis) end is connected to the body by a single pivot, which is typically a rubber bushing. Thus, it may maintain the radial separation from the inboard mount while controlling the position of the outboard end in just one degree of freedom. The arm can move back and forth even if it is not intended to do so; nevertheless, this motion is restricted by a different link or radius rod.