In 2004, bikes with the opposed-twin cylinder "boxer" engine were also revamped. The new boxer displacement is just under 1200 cc, and is affectionately referred to a "hexhead" because of the shape of the cylinder cover. The motor itself is more powerful, and all of the motorcycles that use it are lighter. The first motorcycle to be launched with this updated engine was the R 1200 GS dual-purpose motorcycle. The R 1200 RT tourer and R 1200 ST sports tourer followed shortly behind. BMW then introduced the 175 kg 105 kW (141 hp) HP2 Enduro, and the 223 kg 100 hp (75 kW) R 1200 GS Adventure, each specifically targeting the off-road and adventure-touring motorcycle segment, respectively. In 2007 the HP2 Enduro was joined by the road-biased HP2 Megamoto fitted with smaller alloy wheels and street tyres. In 2006, BMW launched the R 1200 S, which is rated at 90 kW (121 hp) at 8,250 rpm. April 2007, BMW announced its return to competitive road racing, entering a factory team with a "Sport Boxer" version of the R 1200 S to four 24-hour endurance races. A street version of the R 1200 S Sport Boxer is expected in 2008, rated at 144 hp (107 kW), and weighing 195 kg fully fuelled.
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