What is the formula to equate unsprung weight to sprung weight?

I keep hearing different numbers from as high as 10:1 to 2:1.

Reson I ask is. If i get new rotors and lighter wheels and I manage to save about 46 lbs of unsprung weight. And that equates 460 lbs of sprung weight? Hey it will definetly be worht the money.

 

sprung weight is 1:1

rotating wheel weight is 1.5:1

 

I'm confused.
Sprung weight is 1:1 Got it.
Rotating Weight is 1.5 :1 is that just the wheel and tire?
What about unsprung like rotors . Not rotating but unsprung
Also where did you get the info. This just adds speculation without a formula. Someone said something about a formula
where it's at?

 

Rotors rotate.

There is no forumla. You have to integrate over the volume of mass. Rotational inertia increases with the square of angular acceleration and wheels dont spin fast enough to make that big a difference, unfortunately.