The most powerful convertible made by Bentley is the stunning GTC Speed. This all-wheel drive car has the twin-turbo W12 engine, six-speed automatic transmission and lower suspension. The transmission also has manual controls via the gear-lever or the paddles on the 3 spoke dual tone steering wheel. The options on this car include Contrast Stitching, Adaptive Cruise Control, Reversing Camera, Valet Key and Privacy Hand Set. There are many difference from the standard GTC, these include the rear spoiler, rifled exhaust pipes and unique 20 inch dark tint, multi-spoke alloy wheels that come with Pirelli P Zero tyres.