The bike is built in Maya and Zbrush, with minimal preceeding sketchwork. I use Maya for the basic shapes and proportions, then brings those meshes in to Zbrush for some dynamesh tweaking and additional sculpting. The last step before leave Zbrush is usually to add some insert meshes like bolts, caps and surface details.
The renderings is, like always, done in Keyshot 4. I honestly donät know what I would do with the great guys over at Luxion (Hi Josh, Thomas and Henrik)!