BMW 3 Series Klapp Top

The BMW 3 Series KlappTop was a retractable hard-top cabriolet project developed by Bertone in collaboration with Edscha and presented at the Mondial de l’Automobile in Paris, held from 30 September to 15 October 2000. The project was based on the BMW 320 and was intended to update the traditional concept of the four-seat cabriolet by applying advanced folding-roof technology to a conventional saloon platform. Bertone had long experience in cabriolet design, while Edscha was a specialist in convertible roof systems. Their cooperation drew on previous work connected with BMW. Bertone had already built a BMW-based cabriolet in 1961, derived from the 3200 CS, and had also presented the experimental BMW Spicup in 1969. Edscha had supplied convertible roof systems for BMW since 1985, including systems for the 3 Series and the Z roadster family. The KlappTop continued this technical and stylistic relationship. The KlappTop system was a retractable rigid hard top made from five movable roof panels. The rear panel incorporated the glass rear window. The roof mechanism used 13 links on each side and was operated by two hydraulic cylinders. Electronic locking secured the roof automatically in both final positions, either fully closed or fully open. The rear parcel shelf was also part of the folding sequence. It consisted of five panels: two sliding side panels, a central panel, and two hinged side elements attached to it. This section was operated by four electric motors, two on each side. The main rear lid, including the original boot lid with its hinges and locks, was hinged to the rear body panel and moved by two additional hydraulic cylinders. The system allowed the BMW 320 to function as both a closed saloon and an open cabriolet. It also preserved practical boot access, even with the roof folded. The project demonstrated how powered hard-top technology, normally associated with higher-end roadsters and sports cars, could be adapted to a modern four-seat vehicle. For Bertone and Edscha, the KlappTop was a technical study showing a new solution for manufacturers seeking a car that combined saloon comfort with cabriolet use.