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The Griso frame is essentially a very strong twin-spar perimeter beam design similar to many other modern motorbikes. Biggest difference compared to similar designs by other manufacturers is that the spars are made of tubular steel rather than aluminium.The CARC series bikes are built on essentially four platforms with four frame types. Griso, Stelvio, Sport/Norge and Bellagio. The first three are all variations of the perimeter beam design, the Bellagio is more like a modernised Tonti frame without lower cradle rails.The Griso frame may be inherently stiffer but the bike�s main handling superiority comes from its superior suspension, most particularly its forks.The Spineframe was an entirely different design last used on the V11 series some 12 years ago.Pete