I don't know, Kurt. Probably somewhere around 1600 pounds.:rolleyes: The springs are designated as "Honda Civic racing springs" and we all know that a Civic is pretty light. However, the effective rate of a spring at the wheel is dependent on leverage (the type of suspension and where the spring is mounted in relation to the pivot points of the suspension components). On my roadster, however, there is no fancy or complicated geometry involved like on independent suspension. In this case, with the springs mounted directly between the frame and a beam axle, the chassis "feels" the full rate of the spring. I bought four of these springs in a kit with the idea that I might use them on all four corners. When I got them I soon realized that they were much too stiff for the rear. In the past I have used Ford Escort, Chevy Chevette, and Geo Metro rear coils in the rear of an array of different vehicles. These springs are stiffer than any of those.:eek: