Overview
The E90 has broad appeal being BMW's highest selling model, and being the highest selling luxury car in the US and Canada, with numerous body style and engine choices it is a very flexible car that offers a wide range of performance levels including even the M3 which is based on the E90. To accommodate such a wide variety of roles the E90 is equipped with a fully independent suspension including aluminium MacPherson struts in the front, and steel 5-link Multi-link suspension in the back. Front brakes have much more stopping power than rear brakes, and one feature of the E90's suspension is to allow very large, high performance front brakes. Also, the use of steel designed to provide high strength for casting applications allowed BMW to greatly reduce the weight and cost of the rear suspension, in addition, the rear axle can be completely pre-assembled and adjusted with the brake system and suspension.
Read more about this topic: BMW 3 Series (E90)