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usually not recommended due to spring rates specially if the poundage is different. you may find swapping rear end (or front) on the corners if the poundage isn't right.
RSR regular down:
Spring Rates:
Front 5.48kg/mm
Rear 7.40kg/mm
The RSR down front and rear already have different spring rates and I just checked,
The super down front spring rate is: Front 5.10kg/mm
The RSR down front and rear already have different spring rates and I just checked,
The super down front spring rate is: Front 5.10kg/mm
Would that make a difference..?
Spring rates are all over the map, so we can't go by them only as there's many other factors in their design (length, thickness, number of coils, etc.). Only wish it were that easy!