Originally posted by Racing4Evo
On most race cars the front and rear springs have the same spring rate. The only difference is the number of coils which also happens to be length as well. The fewer number of active coils on a spring the higher the spring rate. So, because there are less coils on the front springs, they are harder than the rears.
Well, sort of . . . .
The variables that influence spring rate are:
Outside diameter of spring.
Number of active coils.
This springs thing was discussed recently, HERE