The design, which is more than 20 percent lighter, ensures
lower unsprung masses as well as enhanced driving dynamics, agility and ride comfort.
The specially calibrated elastokinematics, the large axle sub frame mounting and supporting system, the compression strut connecting the suspension and body and the high structural stiffness combined
with low unsprung masses create an excellent overall balance between agility and comfort.
As well as
boasting low unsprung masses, the brakes also give superior heat tolerance, excellent wet braking performance, ease of use and excellent feel.
Overall, some 17.6 pounds have been pared from the standard 3 - and 4 - series suspension — 11 pounds up front, and a further 6.6 at the rear, leading to
lower unsprung masses at each wheel.
Available in combination with optional 20 - inch wheels, they measure 16.1 inches up front and 15.6 inches at the rear and are claimed to weigh less in total than the standard steel items, for
significantly lower unsprung mass.
The front axle is constructed from five control arms per wheel; its aluminum forged parts
provide low unsprung mass and ultra-precise wheel guidance.
In conjunction with the wide track width and configuration for large tire dimensions, wheel location and spring elements, which are independent of one another, facilitate high lateral acceleration, while
the low unsprung masses promote the agile driving feel yet further.
The result is
lower unsprung masses, giving advantages in terms of handling and spring / damper element response.
Also introduced as an option for both Coupe and Roadster variants is a new Sports Pack which comprises forged lightweight alloy wheels aiding
a lower unsprung mass, re-tuned Bilstein dampers with improved dynamic response, up - rated springs and a revised rear anti-roll bar (Coupe only).