Hey, i have a set of Tein's in my 180sx so i want to keep my C spanners (they are copy's anyway and dont work very well)
Spring rate's i am unsure of, ill have a look at them and see if i can find out!
Im guessing if they are like my HA's in my 180, then that are around the 8 mark! which is fairly harsh for daily but unreal for track!
hope that helps!