Mercedes-Benz Concept Vehicles
Stuttgart
Aug 22, 2011
A fresh vision for the roadster: SLK I and SLK II concepts
The facts
  • Vehicle 1: SLK I concept
  • When: Spring 1994
  • Where: Turin Motor Show
  • Vehicle 2: SLK II concept
  • When: Fall 1994
  • Where: Paris Motor Show
  • What: Sporty roadster with compact dimensions and innovative roof
  • Drivetrain: Four-stroke four-cylinder petrol engine, rear-wheel drive, five-speed manual transmission
Technical highlights
  • Vario roof
    Introduced 1996 in the Mercedes-Benz SLK (R 170)
  • Carbon fibre dashboard
Ever since the 1950s, the letters ‘SL’ have stood for a very special breed of Mercedes-Benz: sporty (‘S’), light (‘L’) cars which were traditionally for the most part open-top roadsters. The SL series is now an established part of the range.
In 1994, however, the time had come for a new, compact version of the SL. The SLK concept made its debut in two stages. In spring 1994 it appeared at the Turin Motor Show. Already in near-production form, it still lacked a roof however. That followed in the second SLK concept, which appeared a few months later at the Paris Motor Show. At the press of a button, the sensational electro-hydraulic ‘vario roof’transformed the SLK from a convertible into a winter-proof coupé – or vice versa – in just 25 seconds. Mercedes-Benz was the first manufacturer to revive this type of roof, which harked back to an earlier era. When the SLK appeared as a production model in 1996 (R 170), its roof was such a hit that several competitors subsequently brought out versions of their own.
The SLK concept took a variety of design cues from its imposing big brother, the SL, producing its own variation on the latter's themes of elegance and dynamism. The result was styling which looked to the future while at the same time being firmly rooted in the tradition of the Mercedes-Benz brand. Styling which refers to nothing beyond current modernity would not be Mercedes styling, said the then Design Chief Bruno Sacco. The face, the short overhangs front and rear and a pronounced wedge shape emphasised the affinity with the SL and gave an impression of agility. In other areas the SLK concept took a tangent however, for example in its compact exterior dimensions and various other highlights. These included the sheathed roll-over bars behind each of the two seats, which harked back to the successful 300 SLR sports car of 1955.
A pared-down look can be quite desirable in a roadster, as the interior of the SLK concept attested with an abundance of exposed, gleaming metal surfaces, only twenty per cent of which sported any trim or cladding; in the later production SLK of course, it was a different story. A key design element was a dashboard of very lightweight carbon-fibre material which gave the appearance of floating in mid-air. Two stowage nets underneath it continued the minimalist theme, although they were at the same time perfectly practical. The instruments were aluminium-rimmed, as was the ignition lock, which was positioned in a horizontally swivelling hemisphere. Set in a second aluminium hemisphere in the centre console was the short gearshift lever. Minimalism and low weight – these themes, complementary and appropriate in a sports car, were indulged extensively in the SLK concept, right down to the perforated aluminium accelerator, brake and clutch pedals.
The second SLK concept exhibited a different interior. Appropriately in light of the venue – Paris – the keynote was elegance, with plentiful luxurious leather trim. As on the outside there was a preponderance of blue. This was a salute to the host country, since blue was the traditional colour of French racing cars. There was no attempt to be too fashionable, however. We have to remain true to ourselves, commented designer-in-charge Peter Pfeiffer, we don’t want to pretend to be something we’re not, i.e. fashion designers. For the most part, the bodywork of the second SLK concept differed from the first only in minor details, although it did sport exposed roll-over bars and the aforementioned vario roof, which folds down into the boot at the touch of a button.
Mercedes-Benz concept vehicles are normally not only drivable, they also demonstrate the brand's high safety standards. The SLK concept was a case in point. Its sturdy windshield frame, sturdy roll-over protection and extremely rigid body structure offered the maximum in passive safety. Further safety features included full-size airbags in the carbon fibre steering wheel or, for the passenger, in the instrument panel, plus belt tensioners. Like all Mercedes-Benz cars, the SLK concept was also equipped with an anti-lock braking system (ABS).
The SLK concept was based on its own custom-designed platform. In classic sports car tradition, it used a five-speed manual transmission to transfer the power from the state-of-the-art four-cylinder four-valve engine to the rear axle. Sheltering behind the new-design five-spoke alloy wheels were vented disc brakes with fixed four-piston callipers.
The SLK concept was sporty, it was light in weight and it inspired the engineers, the marketing staff and above all the customers in equal measure. The production vehicle (R 170) appeared on the market in 1996 and by the end of its cycle, in early 2004, 308,000 units of the compact roadster had been built. Now the success story is being continued by the new SLK, the R 171.
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