Discussion
Which axis do the front and rear roll centres define?
Answer: A
The line joining the front and rear roll centres is the roll axis, and the vehicle rolls about it. Its inclination affects the front to rear balance of load transfer. Pitch is a separate motion controlled by anti-dive and anti-squat geometry. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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