The R25 was fitted with a paddle-operated six-speed semi-automatic gearbox (with one reverse gear). The engine developed 800 bhp, and took the car to a top speed of more than 300 km/hr. Its lightweight chassis was made from aluminum honeycomb composite monocoque and carbon fibre, and its brakes were also carbon fibre all round. With a length of 4.8 m and width of 1.8 m, its wheelbase was 3.1 m.