BMW i8 Roadster is powered by 155 cc engine. This i8 Roadster engine generates a power of 369 HP @ 5800 RPM and a torque of 420 Nm @ 3700 RPM. i8 Roadster gets brakes in the front and rear. Performance of i8 Roadster is backed by a Automatic transmission. The engine is mated to a Automatic gearbox. The kerb weight of i8 Roadster is 1499 cc. i8 Roadster has 4689 mm Length, 1942 mm Width, 1298 mm Height, 117 Ground Clearance.