I was catching up with some car reading when I saw an article about the 1955 Monaco GP in the Dec. 8, 2003 Autoweek. The article had a quote by Mike Hawthorn that I had never seen before about Ascari's fatal crash in 0562M four days after his crash into the harbor at Monaco. I have heard the theories about Ascari having had an undiagnosed concussion that led to a blackout when he was taking his third lap in 0562, a 750 Monza that Castellotti was testing that day for Ferrari at the Monza track. I've also heard the theory about either a workman or a dog crossing the track that Ascari had to dodge at the Vialone curve. But I had never heard this theory from Hawthorn which plugs into our earlier discussion about tires. "Hawthorn was sharing a 750 Monza with Umberto Maglioli in the [upcoming Supercortemaggiore 1000] and arrived at the track (Monza) about an hour after Ascari's crash. They had been unable to get 6.50x16 tires for the race and had to use 7.00x16s. Hawthorn said he had tried their car on these tires and in his first biography, Challenge Me the Race, he wrote, 'I found it very nasty indeed when I came to the Vialone Curve, where there were a lot of little ripples on the road surface. I came to the conclusion that the rims were too narrow for these tires and had them taken off my car. Where Ascari crashed there were long, broad, black tire marks, followed by marks of the wheel rims digging into the road. It seemed to me he probably changed into fifth just as he hit the ripples, the car started to slide, the tires rolled under and the rims gouged into the road, causing it to somersault . . . .'" Sounds like a plausible theory. The Assembly Data Sheets indicate that 0562M was sold with 5.50x16s on the front and 6.50x16 on the rear, but this was after Ferrari rebuilt 0562 after the crash with the smaller tipo 111, 2 liter motor. This is especially timely as my father and I search for replacements for the original Engleberts (5.25x16 front, 6.00x16 rear) for 0556(0446)MD. Dad tells me, though, that he raced his 500 Mondial for 5 years with 6.00s on the front and 7.00s on the rear and never had any 'rollover' problem.