The 2011 BMW 745li is full of unique and innovative feature helping the advances one traditionally expects of a new BMW: namely, evolution in suspension, steering, brakes, wheels and tires. But make no mistake: The 2011 BMW 745li also propels the road capabilities of the largest BMW Series decisively into the future with fascinating innovations: Aluminum suspension. Most major components are of aluminum, which compared to steel reduces unsprung weight. In turn, this enhances riding comfort and, on irregular road surfaces, handling as well. The brake calipers, which move up and down with the wheels as they encounter road irregularities, are also of aluminum for the same reason. Active Roll Stabilization. Combining with the evolutionary aluminum suspension, Active Roll Stabilization is a revolutionary feature. Its primary function is to reduce body roll in cornering, which improves handling by virtue of improved suspension geometry (wheel angles relative to vertical) resulting from the reduced roll. 

In place of conventional, purely mechanical anti-roll (stabilizer) bars, ARS senses cornering motion and hydraulically twists specially configured anti-roll bars to counteract body roll; drivers and passengers alike marvel at The 2011 BMW 745li amazingly "flat" cornering.