Post by David Mitcham on Dec 14, 2016 15:31:51 GMT -5
This website has some information on each car raced in 1967. www.f1technical.net/f1db/cars/years/1967?sid=63583ddc1b0c83d41680a0c834822729 but doesn't consistently have tyres size info and in some cases no data at all! If you can find someone with an Autocourse or Automobile Year for 1967 the information maybe in one or both. Unfortunately I don't have either although I do for 1966 if that's any help.
Interesting question Stewart and hard to find info on let alone 'Hard Data' but this may be of some value to you. I managed to get some pictures of Jacks BT19 a couple years ago at the Phillip Island Historics and took specific interest (and pictures) in the tyres it wore. GoodYear 'Blue Streak' G7 6.00-15 Front, 7.00-15 Rear. Here is a link www.nttyres.com/showPage.php?page=gyvintage&id=gyvintageimagesr0c3 to a chart of the Good Year Blue Streak range and sizes. Tyres progressively increased in width as the years rolled on through the 60's so maybe at some point, possibly the G7 8.00-15 or G15A GoodYears were used, I dont know. Its a handy chart though.
The BT19 was parked next to Jacks' BT12, his 1964 Indy 500 entry at the Historic meet. I know its earlier, but interesting to note it wore Dunlop (R7) CR65 4.75/10.00-15 Front and CR65 6.00/12.00-15 Rear. Here's a link to the Dunlop (R7) CR65 tyres sizes www.garysmotorsporttyres.com.au/dunlop/vintage Interesting to note that these tyres are very close to the GoodYears on the BT19 which did run 3 races in 1967 and interesting to note the other tyres sizes as well. Maybe these Dunlop tyres were used on the Brabhams of 1967. I read (somewhere) they did run on Dunlop, GoodYear and Firestones as well in 1967.
Thanks gentlemen. I was able to download the 1967 Autocourse annual onto my iPad and, though there is no specific tire size info, there is a tech spreadsheet of the principal 1967 F1 cars that includes wheel rim sizes. Rear rim widths varied from 9.5 inches on the Ferrari and 10 inches on the Brabham to 12 inches for most of the others and 13 inches on the Lotus 49. So, it looks like a 10mm wide rim in 1/32 would be a good approximation. As for tire dimensions, perhaps the overall width might have been a bit wider and the contact patch a little narrower than the rim width. I am now digging into my collection of Road & Track magazines from that era in the hopes of finding an article on F1 tires.