McLaren introduced the first car with a carbon-fibre monocoque, pioneering the technology in the 1981 McLaren MP4/1 Formula One car.
A monocoque carries structural loads through the body or shell itself rather than relying on a separate conventional frame. McLaren replaced the usual aluminium structure with a carbon-fibre-reinforced polymer survival cell, producing a chassis that was both exceptionally stiff and light.
The MP4/1 was designed by John Barnard and raced by McLaren in the 1981 Formula One season. Its carbon-fibre construction helped improve driver protection and established a direction that became standard in top-level racing. McLaren’s Formula One expertise later influenced its road-car engineering.
A frequent mix-up concerns the McLaren F1 road car. Introduced in the 1990s, it was the first production road car to use a complete carbon-fibre monocoque chassis. Thus, whether the question is about the first racing car or the first production road car, McLaren is the manufacturer associated with the breakthrough.