Q: What Are Sprung And Unsprung Weight And Why Do They Matter?

asked by on

What are sprung and unsprung weight and why do they matter?

First, we will discuss unsprung weight. Unsprung weight, when considering the automobile, is the mass of the vehicle’s suspension system. To make this clear, the unsprung weight has to do with the vehicle’s suspension system, the part of the vehicle that supports the chassis and drives the wheels into contact with the ground. Unsprung weight usually includes the wheels and anything directly connected to them. You may consider a portion of the struts, braking system, axles, wheel bearings, and vehicle control arm assemblies when speaking of unsprung weight.

The mass of these items is not supported by the suspension system and is the unsprung portion of the vehicle’s total mass. When observing a vehicle traveling over a bump, the vehicle’s chassis seems to rock while the wheels and tires remain in contact with the road. The portion of the vehicle that does not rock is unsprung mass, while the moving chassis represents the sprung mass of the vehicle.

Sprung mass represents the portion of the vehicle’s weight that is supported by the suspension system. The sprung mass includes the vehicle’s chassis and anything directly fastened to it that is able to move while the unsprung mass does not. You may consider the seats inside the vehicle, the engine and transmission assembly, and a portion of the drivetrain as sprung weight.

Unsprung and sprung mass are very important when considering ride comfort and vehicle traction control.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. What Are Sprung And Unsprung Weight And Why Do They Matter?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car door not shutting

Hello. It sounds like your door stay has come apart, and is not allowing the door to close. The only repair is to replace the door hinge that has the door stay built into it. Servicing a door that will...

Q: My rear tire on the driver side feel hot?

Hello there, thank you for asking about your 2005 Honda CR-V. It is normal for tires to get a little warm after driving on the highway. If one tire is warmer than the others, then first check to make sure...

Q: What Can Cause a Vehicle's Suspension To Collapse

The suspension on your vehicle is comprised of many different components. Any of these components can fail at any time, but most suspension parts will fail slowly over time. If you have a sudden change in the way that your...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...