Does anybody know the wheelbase and rim sizes of the 312 PB's?
Wheelbase 2220 mm (87.4 inches), track 1560 mm (61.4 inches) front, track 1570 mm (61.8 inches) rear. Length 3770 mm (148.4 inches). Width 1960 mm (77.1 inches). Center lock Campagnolo cast magnesium-alloy slotted disc wheels, 13 inch front and rear (1971), 13 inch front and 13 or 15 inch rear (1972), 13 inch front and 13 or 15 inch rear (1973)
I don't think the 312PB ever ran a rear tire with a 13 inch diameter. I have lots of pics from the early races but they are too large to post here. All show the car with larger diameter rear tires. I am pretty sure the fronts are 13's as you stated. Ed
I've absorbed the information about the disc wheels from Boxer, the Ferrari flat-12 racing and GT cars by Jonathan Thompson.
In my doc, only the car (312P/B-74) seen in test at Paul Ricard in December 1973 seem had rear and front wheels identicals. But 13" or 15" ? Seems littles ?? On the photo I have the first protopyp (Alu) had the same wheels as 312P. Gilles
His info on that page must be mistaken. I have the book. The info you quoted is as you said, on page 179. However if you go to page 122 and look at the very last paragraph he states the rears were 15's. No mention of 13's for the rear anywhere in the chapter. Also if you look on page 124 and 125 (in fact all the pics in that chapter) you can clearly see the size differences in the rims. I am sure the fronts are 13's as the 312PB is a very small car but also during that time they were experimenting with very small front tires. Remember the Shadow from Can Am? Looked like a toy. Ed
