BTR DUAL SPRING - .685" LIFT - 100 PC - SP010-100 BTR’s .685†lift springs are for serious hydraulic roller motors that will make a living in the northern areas of the RPM range. 100 dual springs included. These springs service popular spring kit part numbers SK004, SK702, SK703, SK704, and SK707 170 lbs @ 1.800†450 lbs @ 1.115†Coil bind @ 1.000†408 lbs spring rate