That car was driven by both Foyt and Fangio. The only other car I can think of that could top that is the '67 LeMans winner, wich was driven by both Foyt and Gurney in the same race.
No its not Watson....cant remember his name but will try.... It caused my brain to start smoking when I tried.....
OK. So it's not tread WIDTH that the 18" refers to. My only personal reference point is dirt late model racing. I'm sorry. Back to the picture. Could the white flat top crew cut man on the right be AJ Watson?
Racenutdon, they were 18" dia. rims, not 18" wide, so as Dennis said, 8.20x18, would be 8.20" iwde at the belly of the tire. Looking at the proprotions of the tire in the pic, that would make the tread width about 5 to 5-1/2".
also...note the roll bar. Its the first year roll bars appeared. One on Foyts car and one on Bryans belond # 1 winning car. This pic was taken really early in may. Probably during the first week during rookie tests.
sorry left out The only place a tire can dissapate heat is thru the sidewall which is why the sidewalls on racing tires are sooo thin. They can hardly support the weight of the tire....the thinner the sidewall...the quicker the heat goes out the sidewall.
16 inch on the front 18 imch on the rear...Trust me The rears were I believe 8 20 X18 fronts 7 60 X16...The tread was strickly for measurement of wear and the driver cud see the tread. After the last tread was gone you had about 10 laps max. 18 inch on the rear 16 inch on the front...16 and 18 a tire thru the sidewall....which is why racing tires have such a thin sidewall. Its the only palce heat can be dissapated. Those tire were like concrete and we used to kid the Firestone guys, Steve Petrasik, Bill McCreary, Steve Petrasek, Del Neal and Bob Cassaday, that we cud see the sparks in 1. In 1956 the sidewalls were too thick and they had massive tire failure..ie Russo in the Novi in 1 and Bettenhausen in the 99 Balenger car. But yes Don...they were 18 inch tires on the rear..16 on the fronts.
There's no way that's an 18 inch tire on the rear. That would mean 3 feet of tire width across the rear. I believe an Outlaw sprint car runs that kind of tread width for ONE rear tire.
Tire tread was the prefered method of dissipating heat build up at that time. The question I thought about this morning after seeing this follows. Does AJ have any trophies for his accomplishments at Indy. He wasn't rookie of the year and the "Baby Borgs" didn't come along 'til after 1977. Thank you Donald for the history on the car.
I didn't know the answer right off the bat, but when I looked at how the two tread strips were on the outside edges of the RF and RR tires and the inside edge of the left tires, I'll have to say that the tread is only there so that the driver and crew can see how far the tires are wearing out....right?
Note the tread on the Firestone tires...can anyone tell me what purpose they served? They were for a reason...and it wasnt for grip....Those tires were really HARD. Racers used to joke aboutthe sparks they threw off in the turns. 16 inch tires for the front and 18 inch tires for the rear........