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These Roll-Center adapters are installed to correct suspension geometry after a car has been lowered. The uneven length of suspension arms causes Toe adjustments to occur drastically during braking suspension "squat", these Roll-Center Adjusters make up for the travel in the suspension arms to return suspension geometry to it's correct starting point. This allows alignment and steering to remain more consistent and predictable during aggressive driving and competition.
Front roll center is determined by the angle of the lower control arms and the angle of the upper strut mounting points. These angles, drawn in space, determine the instant centers for the front suspension (instant centers are the points that the entire suspension moves around during body roll). Then take a line from each instant center to the middle of the tire tread on the opposite side, and where these lines intersect, there is your roll center.
Roll center angles must be measured from pivot point to pivot point. Modifying merely the angle of the arm doesn't do anything at all. Most of the "RCA" ball joints don't do anything besides move your arms closer to the ground.
Please Note: Due to the complexity of the installation, professional installation is REQUIRED!
