A few weeks ago I wrote about Lightweights. In the context I was writing about, they were special cars, built to be incredibly light. Cars like the Lotus 7 and Ariel Atom are perfect examples of this. They were built as street-able cars with track-able performance. The Ariel Atom is fairly recent, only being built in the last few years. The Lotus 7 can trace its roots back over 50 years.