The revised K Series range of water-cooled inline-four cylinder models began in 2004 with the "BMW K 1200 S" a sport-tourer. The K1200S was primarily designed as a Super Sport motorcycle, albeit larger and heavier than the closest Japanese competitors. Other additions to the K Series range were the 2005 BMW K 1200 R naked bike and related 2007 "BMW K 1200 R Sport" semi-faired sport-tourer, and the 2006 BMW K 1200 GT sport-tourer. The engine capacity of the K Series was expanded to for the 2008 BMW K 1300 S sport-tourer, the 2009 BMW K 1300 GT sport-tourer and the 2009 BMW K 1300 R naked bike.