Quote:
Originally Posted by Old Baldy
You old dog Larry....you measured the Honda from the crank line.
PS what was the wheelbase of both?
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Yamaha 800 M1 sports a 1430mm wheelbase... whereas the RC212V sports
1450mm... this created a Yamaha with similar weight distribution to the bike
on which the Bridgestone tires had been developed, Stoner's Ducati V4.
Quote Julian Ryder:
"Yamaha have raced on Michelins throughout the current MotoGP era -
until now, that is. Rossi battled with Stoner as hard as he could in
2007, but he soon realised that whatever he did was going to be undone
by the characteristics of the Bridgestone tyres Casey was using. The
Bridgestones had been developed for the Ducati's more rearward weight
distribution. With a stiffer carcass they could take more power
mid-corner, giving Stoner a big advantage in acceleration out onto the
straights. To work, this required a front tyre that still gripped even
when unloaded by weight transfer under acceleration.
Valentino success fully swapped to Bridgestone at the first test of
2008. He wasn't interested in any old Bridgestone tyre, either (there
are several families); he just wanted to get onto the same 'family' of
constructions that Casey was using. Testing seemed to go well and the
bike arrived in Qatar looking just like it had the year before, but
with Bridgestone stickers. However, the race didn't go to plan for
Rossiand Yamaha: the set-up wasn't right, the rear tyre started to
spin up and Valentino finished a fighting fifth, beaten by Stoner and
his own Michelin-shod team-mate, Jorge Lorenzo."
"What followed was a change of strategy. Tohru Ubukata, Bridgstone's
technical boss, conceded: 'After Qatar we had a BIG meeting.' By the
next race, at Jerez, changes were under way. Rossi set his bike up
with the rear axle further forward in the swingarm adjusters; the
front was different too, with the head stock pushed to the front of
its adjustment. Effectively the core weight of the bike, the center
including the engine, had just been moved backwards by about 35mm.
This time there was more weight over the rear of the bike so that, as
the tyre wore, it had the weight which it needed to keep gripping, and
the front didn't let go. And Rossi made it onto the podium."
"All this created a Yamaha with similar weight distribution to the bike
on which the tyres had been developed, Stoner's Ducati. It also meant
that Rossi had to change his riding style to accept what must be a very
vague front-end feeling and to get on the power earlier and harder,
again just like Stoner. With the bike putting its weight where the
tyres wanted it, and with the resulting riding style programmed in,
Rossi started winning. Yamaha were now getting podium places with two
completely different set-ups on one design of motorcycle."
So with similar weight distributions there goes the last advantage the I4
had over the V4... and that means Furasawa has no more excuses not to
explore the V4...