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You are correct jimster, that's a spring rate if i've ever seen one. I have no clue how you can define a lowering by a measure of spring rate; whatever it was it must ahve meant that the car's spring rate was lowered by 10kg/mm or something to that extent.
I was told to use a formula of 1Kg='s 56lbs. So,....10Kg should mean a spring rate of 560lbs. Which I do believe equals what Tein show's for the specs on the flex coilovers, they show both measurement systems. 10kg and 559lbs
It is the spring rate, it means that the spring will deflect 1 mm when 10Kg are applied, so for example a 10kg/mm spring is softer than a 12kg/mm spring.