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The most common way to measure bumpsteer is to support the car on jackstands and using a jack, move the spindle up and down in the range of motion it will have during a racing lap. If your wheel travel is 3-4 inches, moving the wheel 1 or 2 inches up and down will not simulate the conditions. For most asphalt racing, both front wheels travel up in relation to the chassis. For dirt cars, the left front may well travel down considerably.