Cross weight
The share of total car weight carried by the right-front plus left-rear diagonal. At 50% a symmetric car tends to behave the same in left and right corners; above 50% it tends toward understeer in left-handers and oversteer in right-handers, and below 50% the opposite. On most cars it is not a directly-set value: it is the RESULT of the corner heights, adjusted in practice through diagonal spring-perch changes. Road-course setups normally aim for 50% unless the track is deliberately asymmetric.
Effect by corner phase
Off-center cross weight splits the car’s mid-corner balance by corner direction.
Symptom tendencies
These describe tendencies, not rules.
Consistent balance difference between left and right corners Mid-corner
Cross weight off 50% is the first thing to check; diagonal perch adjustments tend to move it predictably.
Verify on track before you commit to a change.