Unsprung Mass

Unsprung mass is all of the mass on the vehicle that is not supported by the suspension. This includes: the tire, the wheel, the hub, the upright/knuckle assembly, as well as a portion of the spring assembly and control arms.

To Calculate

Weigh the upright with everything on it. Add half the mass of each control arm and about half the mass of the spring and damper system. (edit this)