# Sprung mass

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Portion of a vehicle supported by its suspension system

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Sprung and unsprung mass are shown

**Sprung mass** (or **sprung weight**), in a [vehicle](/source/Vehicle) with a [suspension](/source/Suspension_(vehicle)), such as an [automobile](/source/Car), [motorcycle](/source/Motorcycle), or a [tank](/source/Tank), is the portion of the vehicle's total [mass](/source/Mass) that is supported by the suspension, including in most applications approximately half of the weight of the suspension itself. The sprung mass typically includes the body, frame, the internal components, passengers, and [cargo](/source/Cargo), but does not include the mass of the components at the other end of the suspension components (including the [wheels](/source/Wheel), wheel bearings, brake rotors, calipers, and/or [continuous tracks](/source/Continuous_track) (also called caterpillar tracks), if any), which are part of the vehicle's [unsprung mass](/source/Unsprung_mass).[1]

The larger the ratio of sprung mass to unsprung mass, the less the body and vehicle occupants are affected by bumps, dips, and other surface imperfections such as small bridges. However, a large sprung mass to unsprung mass ratio can also be deleterious to vehicle control.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

## See also

- [Unsprung mass](/source/Unsprung_mass)

## References

1. **[^](#cite_ref-1)** ["Sprung mass and Unsprung mass"](https://www.zigwheels.com/news-features/news/sprung-mass-and-unsprung-mass/9188/). *ZigWheels*. 5 August 2011. Retrieved 19 July 2014.

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