Icon Vehicle Dynamics Suspension Question: Why does Icon Vehicle Dynamics offer both 4″ spring and 4.5″ hanger systems?
Most aftermarket lift springs offer an increased spring rate. As a result the increased rate requires greater force to compress a spring an equal amount which typically adversely effects ride quality. Now, increased rate can be beneficial if additional sprung weight is added such as with a replacement bumper and/or winch. However, ideally you want the lowest possible spring rate for the given ride height. Lift springs achieve increased ride height through either stack height or (more commonly) increased rate. Hanger lifts such as those by Icon Vehicle Dynamics provide increased ride height without increasing spring rate. The DR hanger kit offers an additional advantage by the inclusion of a longer replacement shackles in lieu of a shackle relocation bracket. As a result the polar moment about the longer shackle allows for improved impact absorption. When combined with application specific shocks, this kit will provide improved ride quality over stock. The DR 4″ spring system achieves m