Body Safety: Notes

Torsionally rigid occupant safety cell with roof bow welded above the B post.
Crumple zones at both the front and rear.
Achieves crash safety requirements with respect to front, rear and side impacts.
Body torsional rigidity of 27,000 Nm per degree. (Compare this to 10,500 Nm per degree for the E46 Convertible and 7,500 Nm/degree for the E36 Convertible.)

Fig 1: Body Shell

Courtesy of BMW OF NORTH AMERICA, INC.