This six-wheeled car competed in the premier class, Formula 1.The Tyrrell engineers in their search for better aerodynamics began to reduce the front wheels, to consistently reduce contact with air. But the wheels fell also reduce the adhesion of the vehicle to the road and was at this time when someone had the bright idea to add two more wheels forward to combining the best aerodynamics of small wheels with improved the grip of the 4 front wheels.
The P34 was premiered at the Grand Prix of Spain in 1976 and proved to be competitive, but his best moment was undoubtedly the Grand Prix of Sweden the same year, in which P34 was doubled, achieving the first and second position.
and closer in time to Ferrari who also tried to prove the six wheels in the Ferrari 312T2, although the provision was different back four in a row, 2 on each side with the common axis and two in front. Williams also tried giving her 4-wheel drive car.
Today no one could repeat a similar image, at least in the Formula 1, since after the attempt to Williams, the FIA \u200b\u200bbanned the use of 4 wheel drive and in case after the use of 6 wheels.
OTHER 6 WHEELS.
At that time there were many other attempts around this idea.
Ferrari's own built a prototype of 312T2 6 wheels in 1976 (named T6), but with a different approach: the four rear wheels (which actually were the same diameter and width than the front) were mounted in pairs in the same eje, al estilo de los Auto-Union “Bergennwagen” y E.R.A. de pre-guerra en las subidas en cuesta.
La idea de Mauro Forghieri era reducir el coeficiente aerodinámico total reduciendo las ruedas traseras, que en aquella época eran enormes. También se intentaba evitar el flaneo de los flancos en curvas rápidas a gran velocidad (para lo cual el eje trasero iba acoplado a un puente de Dion). Tanto Lauda como Regazzoni tuvieron oportunidad de probarlo en la pista de Fiorano en 1977, y no quedaron descontentos (aunque Reutemann lo estrelló e incendió en unas salida de pista un tanto extraña). Pero tras el accidente del austríaco en Nurburgring, todo el proyecto fue cancelado.
However, his broad back was out of regulation
A few years later came a more serious attempt.
With the progression of turbocharged Renault, who was easily the pole, some teams did not know how to oppose. And when he developed his own Ferrari turbo engine, the 126C, the picture was clear.
So Frank Williams and Patrick Head tried to find alternatives for the 1982 season. So they developed FW08 model doubled, one conventional and one with 6 wheels. So much so, that the 4-wheel battle was shorter in order to accommodate the second rear axle, which gives Williams the solid appearance. The intent was the same as that of March, improve straight-line speed and traction out of the curves by increasing the contact surface, but allowing the free passage of air along the side pods to the axis rear. 
As the rules allowed the ground-effect "inside" the battle of the car, Head interpreted this standard going forward to the last axle rear axle. The front-rear axle moved forward 4 inches, with the axle shafts at an angle, and rear-rear axle was powered by a gear added to the end of the gearbox. Alan Jones tested the prototype at Donnington Park but was not convinced. In addition, the team found a serious problem: the lower legs of the rear suspension air flow interfered to create the effect and soil.
Once this is resolved, another prototype was presented somewhat differently in Donnington Park, the times which were stunning. In fact they were so good that the FIA \u200b\u200btook action on the matter by banning cars with more than 4 wheels, just in case, only allowing the front outside guideline.
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