The mid-80s BMW R-series of motorcycles is an immensely popular platform for customizing. They have everything to love about BMWs — the flat-twin airhead engine, carburetors, and a distinctive single-sided swingarm and monoshock. Barbara Custom Motorcycles' Black Mamba concept starts with a BMW R80 and turns it into a futuristic spaceship on two wheels. A modern RnineT swingarm and USD front forks are fitted to the R80 frame and motor, with a radical single-piece fairing that combines the seat, tank, and headlight. The Black Mamba strikes a perfect balance of retro and forward-thinking design.