2021 BMW 4 Series convertible revealed in patent images

New images have emerged of the upcoming 2021 BMW 4 Series Convertible. Published by China's National Intellectual Property Administration – and revealed through Autoblog – the rendered design drawings suggest BMW is planning to replace the current generation retractable metal roof with a more traditional (and lighter) soft top. Earlier this year a prototype of the model was spied testing at the Nürburgring.