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Roll center is the imaginary point about which the car rolls when cornering. It is found by sketching the upper and lower control arms and extending there length to the point where they intersect. Then from this point sketch a line back through the center of the tire at ground level. Where the two lines (from either side of the car) intersect is the roll center. (Not a great description but should be easy to find a sample sketch somewhere on the net)
Near zero bumpsteer in this case is not nearly as impressive as in a regular production car with probably two or three times the travel. (It also is not to hard to do with production pieces if their relative relations aren't fixed.)
Jim
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