Lambo's one-off Aventador J 05 | 03 | 2012

LAMBORGHINI JUST CONTINUES to get more outrageous: this is the Aventador J, a one-off, road-legal roadster. Lambo boss Stephan Winkelmann says it's a testament to his firm’s commitment to pushing the limits of design, despite increasingly rigid road car regulations.

The roofless roadster takes its name from the world motorsport governing body’s ‘Appendix J’ regulations, which define racing car class specifications.

The J also invokes Lamborghini’s history, referencing the one-off 1970 Lamborghini Jota, which was a high-performance version of the legendary Miura.

The Aventador J is forms the Italian supercar builder's centre point on its stand at Geneva: days after the show finishes, it will be sold for an undisclosed sum as “the most extreme expression of Lamborghini DNA in existence”.

Cost? It's expected to change hands for well over £2 million.

If that's slightly above your affordable budget, Lamborghini insiders have confirmed a more widely available, but less extreme, Aventador roadster will be launched later this year.

See more official photos of the Lamborghini Aventador J

The J is powered by the same 690bhp 6.5-litre V12 as that of the fixed-head car. It also has the same four-wheel drive system and uses a modified version of the same pushrod suspension.

Based on the Aventador’s carbonfibre monocoque, the J has been extensively modified to accommodate the roofless structure, as well as being stripped out in the interests of saving weight. The bodywork has also been substantially reworked to boost aerodynamic grip.

It's also significantly lighter than the coupe: it's lost the roof, windscreen, air-con, stereo system and sat-nav. Interestingly, Lamborghini has not released its weight.

At 4900mm in length, 2030mm wide and 1110mm high, it is 120mm longer and 26mm lower than the Aventador coupé; the width is the same.

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Jim McGill