The R-Class is a multi-purpose vehicle (MPV) offered by Daimler AG in 2006 model year under the Mercedes-Benz brand. It is the first full-sized multi-purpose vehicle ever produced by Mercedes-Benz. It was first seen at the 2001 Detroit Auto Show as the Vision GST (Grand Sports Tourer) concept, and the final production vehicle was shown at the 2005 New York International Auto Show. The R-Class is built on the W251 chassis, and is assembled in Tuscaloosa, Alabama and Toluca, Mexico. It is priced between the M-Class and the GL-Class. It was initially marketed by Mercedes-Benz as a "Sports Cruiser" and later as a "Family Tourer".
The R-Class is offered in two wheelbases, 2,980 mm (117.3 in) and 3,215 mm (126.6 in), the latter being the lone offering in the US.
Models using the BlueTec diesel engine were introduced for the 2009 model year in certain markets, with other markets getting Mercedes' BlueEFFICIENCY technology.
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... Mercedes-Benz's 7G-Tronic seven-speed automatic transmission is standard across the R-Class lineup, with the R63's version of the gearbox featuring AMG-calibrated shift times ... The notion of a high-performance AMG version of the R-Class was not well-received, given the heavy weight of the vehicle, and as Mercedes-AMG in general was ... taken out of production in 2007 along with several changes in the R-Class lineup ...