base on a 1984 spider.. lets say my car weighs in at 2400 pounds,,52f/ 48 r weight dist. front arm lenght is12"( lower) and the spring centre sits inboard of the ball joint at 8" from the inner pivot point. so that would give a efft. rate of ??? front weight ( axle ) 1248, each wheel get a load of 624 pounds, rear... 1152 weight on the rear axle, each wheel 576 pounds.. so using the .7 ratio on the front suspension , each spring on the front whell should go about..891( round up to 900 inch/lbs, unloaded spring )( agian these are just est. it's dark outside, so i cannot at this time get a good measurment) as for the rears?? in the morning i will get better measurments.... any thought here? i am running 1150 inch/lbs front spring static rate not on the car,, but i think it works out to be..805 inc/lbs loaded rate .. any ideas? as for 'rates' i am using , if you stand a spring on a solid surface, place 'x' amount of weight on it and it moves 1" this would be the ' rate'