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The diagonal weight balance of a car, also called cross-weight. It is the sum of diagonally opposite corner weights expressed as a percentage of total weight. A 50% cross-weight means the car is balanced for equal left and right cornering.
Carroll Smith's Racing Chassis and Suspension Design defines it: "Wedge, or cross weight, is a commonly used oval track racing term that refers to the proportion of tire normal loads borne by diagonally opposed wheels. For oval track race cars turning to the left, wedge is positive when the sum of the RF and LR tire normal loads exceeds 50 percent of the total." Segers in Analysis Techniques for Racecar Data Acquisition describes simulation work: "To establish the ideal weight distribution, some simulations were done to investigate the effect of front weight distribution and diagonal weight distribution (cross weight) on lap time performance. For the cross weight balance there is a clear optimum at 49.5%." Bolles' Advanced Race Car Chassis Technology adds the practical procedure: "Establish the correct setup in the shop — balance the wheel loads (cross-weight) before the car is driven. Always maintain the original ride height when adjusting cross-weight."