There will be no shortage of two-wheeled vehicles at next week's Interbike trade show in Las Vegas. The largest bicycle trade show in North America remains very much about pedal power, but in addition to the high-end Tour de France-worthy road bikes, go-over-anything mountain bikes, and hipster- and messenger-friendly fixed gear bicycles, there are those that are juiced up with electric motors and batteries. The idea here is that bicycles that are pedal powered while offering a motor assist would be ideal for commuters.