The Tyrrell P34 (Project 34), commonly known as the “six-wheeler”, was a Formula One (F1) race car designed by Derek Gardner, Tyrrell’s chief designer. The car used four specially manufactured 10-inch-diameter (254 mm) wheels and tyres at the front, with two ordinary-sized wheels at the back. Along with the Brabham BT46B “fancar” developed in 1978, the six-wheeled Tyrrell was one of the most radical entries ever to succeed in F1 competition, and has been called the most recognizable design in the history of world motorsports.
The P34 was introduced in September 1974, and began racing in the 1976 season. It proved successful, and led other teams to begin design of six-wheeled platforms of their own. Changes to the design made for the 1977 season made it uncompetitive and the concept was abandoned for Tyrrell’s 1978 season. The other six-wheeled designs ended development, and F1 rules later stipulated that cars must have four wheels in total. The existing frames have since seen some success in various “classics” race events, but today are museum pieces.