2006 Mercedes-Benz R-class (W251) Dimensions, Size & Specs

The Mercedes-Benz R-class (W251) has a curb weight ranging from 2115 kg to 2330 kg (4665 to 5134 lbs) and a maximum weight between 2790 kg and 2900 kg (6151 to 6393 lbs). The heavier curb weight provides a stable, solid driving feel typical of luxury station wagons, contributing to enhanced ride comfort and safety. However, this weight also means that the vehicle requires a powerful engine to maintain performance and fuel efficiency. The maximum weight accounts for fully loaded conditions including passengers and cargo, affecting acceleration and braking distances accordingly.

The luggage capacity of the Mercedes-Benz R-class (W251) varies depending on the seating configuration. With the rear seats upright, the luggage compartment offers between 324 liters and 550 liters (11.4 to 19.4 cubic feet) of space, sufficient for everyday items and moderate cargo. When the rear seats are folded down, the capacity dramatically increases to a range of 1950 liters to 2407 liters (68.9 to 85.0 cubic feet), allowing for transport of large and bulky items. This flexible cargo space makes the R-class highly practical for families or those needing variable storage.

A standard residential garage typically measures around 2440 mm (8 feet) in width and 4880 mm (16 feet) in length. The R-class (W251) has a width of 1922 mm (75.6 inches) without mirrors and 2168 mm (85.4 inches) with mirrors extended, which may be tight for garages narrower than 2200 mm. Its length of approximately 4922-4938 mm (193.9-194.3 inches) is slightly longer than typical garage depth, potentially requiring careful positioning or a deeper garage space. Clearance height ranging up to 1674 mm (65.9 inches) is not usually an issue in standard garages, but width with mirrors is the key limiting factor for ease of parking.

The Mercedes-Benz R-class (W251) has a height between 1634 mm and 1674 mm (64.3 to 65.9 inches). This relatively tall stature enhances the vehicle's interior headroom and creates a commanding road presence, aligning with its luxury MPV (multi-purpose vehicle) qualities. The increased height improves visibility for the driver and passengers, and supports a more upright seating position that enhances comfort on long journeys. From an aerodynamic standpoint, the height is moderate enough to balance reduced wind resistance with spacious interior dimensions.

The Mercedes-Benz R-class (W251) came equipped with various rim sizes including 17, 18, 19, and 20 inches. Corresponding tire sizes are 235/65 R17, 255/55 R18, 255/50 R19, and 265/45 R20. Larger rims and wider tires such as the 20-inch with 265/45 tires generally provide improved grip and handling at the cost of a slightly firmer ride, while smaller ones like 17-inch with 235/65 tires prioritize comfort and better absorption of road imperfections. This range of wheel options allows owners to balance between sporty handling and luxury comfort.

The first-generation Mercedes-Benz R-class (W163) is actually not an identified predecessor as the W251 represents the first purpose-built generation of the R-class model line beginning in 2005. Prior to the W251, there was no earlier R-class generation that matches this specific luxury MPV/large station wagon category; therefore, there is no direct predecessor to compare. The W251 defined the new segment with its large dimensions and unique styling, setting a new benchmark for spaciousness and versatility in Mercedes' lineup.

The Mercedes-Benz R-class (W251) occupies a unique niche combining the size and interior roominess of an MPV with the luxurious touches and driving dynamics of a station wagon. Compared to contemporaries like the BMW 5 Series Gran Turismo or Audi Q7 SUV, the R-class offers similar exterior dimensions, with lengths close to 4.9 meters (16 feet) and a spacious cabin emphasizing versatility with three-row seating options. Its 324-550 liters luggage capacity (up to 2407 liters with seats folded) is competitive, and its height over 1.6 meters offers commanding road presence. While more MPV-focused than typical wagons, it delivers a blend of luxury, space, and utility that few rivals matched at the time.

The Mercedes-Benz R-class (W251) supports a roof load capacity of 100 kilograms (220 pounds), which is sufficient for carrying roof racks, cargo boxes, bicycles, or sporting equipment. This load limit ensures safe transportation without compromising vehicle dynamics or structural integrity. Owners can fit a variety of rooftop accessories designed for family travels or outdoor activities, enhancing the vehicle's versatility. However, it is important to distribute the load evenly and remove roof cargo when not needed to reduce wind noise and improve fuel efficiency.

While the exterior width of the Mercedes-Benz R-class (W251) is 1922 mm (75.6 inches) without mirrors, the interior cabin width available for passengers is slightly less due to door panel thickness and structural components. Typically, interior width in large luxury MPVs like the R-class would allow comfortable three-abreast seating in the rear with ample shoulder room. This generous width, combined with flexible seating arrangements and high-quality materials, enhances overall passenger comfort, making long journeys more pleasant for adults and children alike.