We have a spherical bearing set up on our shocks in all mounting locations other than the bottom of the rear shock "Fork" mount. We did this because of the precision that the bearing offers. Precise and smooth operation that does not interfere with the shock function.
Spherical bearings are the best option for coil-over mounts. Rubber mounts cause a "Trampoline" effect that must be overcome before the shock can actually work. Rubber also changes the spring rate momentarily until fully compressed. In addition, rubber causes side loads in the shock rod and will eventually damage the shaft.
Plastic or Delrin eliminates the "rubber/trampoline" effect, but it introduces new friction that interferes with the operation of the shocks. Forces are forces and the friction involved in a Delrin/plastic mounting system introduces "Hysteresis" losses that interfere with your shock operation.
LG Motorsports famous GT2 coil overs, now for the C7 model Corvette including Grand Sport and Z06
*Models with Magnetic Ride will require shock simulators.
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