The ContiTech Air Spring 64509/2B9-239/4310 ensures you are Ready for the Road Ahead achieves persistent and low natural frequency between tare and full load. This ensures effective cargo protection, even on poor road surfaces, excellent comfort and health protection for the truck driver, and safe driving conditions. These air springs also offer the capability to lower or raise the truck's body height to match a ramp's elevation or to set up a suitable platform. FleetPride knows you need quality suspension and steering parts to reduce wear and tear and ultimately, downtime. Whether you need cab, truck or trailer air springs, we have the heavy duty air bag you need for a quiet, stable ride. FleetPride is your First Click in Heavy Duty .