BMW didn't need to update its S1000RR superbike. It was already the most-powerful sportbike in the world, and one of the best selling, too-24 percent of all sportbikes sold worldwide in 2010 were S1000RRs. But BMW didn't reach the top of the sales chart by being conservative, so just two years after its debut the model has already been given a significant "facelift." The awesome, 193-horsepower engine is mechanically unchanged, though electronic reprogramming is said to make power delivery feel "punchier" at low- and mid-range rpm, while numerous chassis changes inspired by World Superbike and Superstock racing address sluggish steering and make the bike more agile and responsive than before. The changes are subtle-evolution, not revolution-but significant in number, and address all our criticisms of the first-generation machine. It looks like one of the best sportbikes on the market just got better.