As mentioned on the Bentley website: Speed is embedded in Bentley’s history. The name dates back to our founder W.O. Bentley’s 3 Litre Speed of 1925 and the Le Mans 24 Hour race-winning Speed Six. Then as now, the pursuit of performance was balanced by the quest for refinement. Today’s Continental GT Speed Convertible is a worthy successor. The GT Speed Convertible is the fastest Bentley convertible model. Drive it with the hood down and a new dimension is revealed. You’re no longer an observer of the passing landscape but a part of it, with every aspect of your journey – especially the thrilling sound track – amplified in the open air.
Source Bentley Site