What is the difference between the BMW X1 X2 and X3?

What is the difference between the BMW X1 X2 and X3?

The X1 has a more generous length than the X2, while the X3 is larger still and weighs around 400 pounds more. All three models have similar figures for head and leg room, but X3 offers more shoulder room. X2 provides 50.1 cu. ft of cargo volume, versus 58.7 in X1 and 28.7 in X3.