Why do BMW use staggered wheels on the rears?

Question

why are they used on rears of bmw 745's

Answer 1

rear wheel drive puts a little more rubber on the road

up front tires have less weight and can be a little slimmer for better steering

Answer 2

Wider tires in the back induce slight understeer, which means car does not turn as fast as if it had the same size tires/rims all the way around.  

BMWs are tuned for sporty driving, and this prevents the average person from spinning out too easily when driving very aggressively.

Answer 3

Better traction.

Answer 4

Styling and extra traction when accelerating.

Answer 5

better handling and traction