23 RIMS AND TIRES
GOODYEAR RADIAL TIRES - RADIAL TIRES
GOODYEAR RADIAL TIRES - CHEAP TYRES GOLD COAST - HUNTER TIRE MACHINE TC3250
Goodyear Radial Tires
Tyrrell Six-Wheeled Grand Prix Car
Here are some interesting facts about this unusual race car.
Car: Tyrrell-Ford P34 Engine: V-8 Ford-Cosworth DFV
Maker: Tyrrell Bore X Stroke: 85.7 X 64.8 mm
Year: 1976 Capacity: 2,993 CC
Class: Formula 1 Power: 485 bhp at 10,600 rpm
Wheelbase: 96.6 in Track: 48.6 in Front, 58 in Rear
Notes: Total weight: 1311.8 lbs
Denis Jenkinson describing the first time he laid eyes on the Tyrrell P34.
This famous car was the handiwork of Tyrrell's chief designer Derek Gardner. It's most striking feature of course was the use of four 10 in. wheels instead of the regular two. The front-end layout was intended to "... minimize induced drag by reducing lift at the front and to turn that gain into the ability to enter and leave corners faster". The use of four small disc brakes required a special triple master-cylinder system, each feeding the brakes on one of the three axles. This was necessary as adjustments were required to control locking at the four front wheels. If the two front wheels locked first, then the effective wheelbase of the car was shortened and if the second set of front wheels locked first this resulted in the effective wheelbase being lengthened. The size of the front tires put special stress on the cross-ply tires Goodyear supplied. Had radial-ply Michelin tires been available to the team the story might have been different. Unfortunately Goodyear's tire development program did not have the capacity to properly support the special 10 in. tires used by the P34.
The high point for what was known as Project 34 came at the Swedish Grand Prix in 1976 where Jody Scheckter came in first followed by his teammate Depailler in second. After two seasons and the departure of Derek Gardner the experiment was abandoned.
Goodyear Marking tire high point
After measuring the run-out using a dial indicator, tire technicians may use a crayon or grease pen to mark the high point of radial run-out. In this case the overall run-out is .04 inch. Then the technician would loosen the lug nuts of the hub piloted system, spin the tire/wheel until the high point is at the top, and tighten the lug nuts with the high point of run-out at the 12 o'clock position.
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