I found a suspension I want to try but it's in kg and I want to compare or is there a conversion formula I should use? The fronts of these aftermarket coilovers are are 10kg and the rear is 8kg. Any help is appreciated. TIA.

 

Spring rates are done in kilograms per millimeter or pounds per inch. Do the math conversion. Off the top of my heads that's about 560 lbs/in. and 448 lbs./in.

 

^^ that's pretty close for top of the head calc!