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The amount of weight resting on each individual tire. Equalizing corner weights (cross-weight percentage) ensures the car handles predictably in both left and right turns.
Advanced Race Car Chassis Technology (Bolles) describes the 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 — adjust the spring heights at all four corners when making changes." Milliken's Race Car Vehicle Dynamics adds that most vehicles "are not symmetric for two major reasons: the CG may be located to one side due to an offset engine or other large mass (e.g., the driver), and the car may be wedged — one diagonal supporting more load than the other. Add the weights from diagonally opposite scales to determine this." Cross-weight should be 50% for neutral handling; even 1-2% deviation is noticeable to experienced drivers.