The six-speed transmission in the BMW Z4 Roadster.
A short movement of the shift lever and the gear changes instantly. The clutch re-engages and directs the full force of the drive power to the rear wheels. An cost option for the BMW Z4 Roadster, the six-speed transmission system extracts even more driving pleasure from the muscular torque of the engines. Whatever your driving style, control of the Z4's efficient, dynamic performance is at your fingertips.