Mercedes-Benz has revealed the new 2018 AMG GT S Roadster. The mid-level Mercedes-AMG GT S Roadster fits between the base AMG GT and the higher GT C roadsters; same as for the Coupe models. At the very top of the AMG GT line-up is the track-focussed Mercedes-AMG GT R. br br The AMG GT S Roadster is powered by a 4.0-litre biturbo V8 with 522bhp and 670Nm of torque. The engine is mated to a 7-speed AMG SPEEDSHIFT dual-clutch transmission. The rear-wheel-drive soft-top convertible can sprint from zero to 100kmh in 3.8 seconds. Top speed is claimed to be 308kmh.