I�m fairly certain that Titanium frames and Carbon Fibre chassis are illegal for MSA and CIK competition, can�t remember the exact rule but it�s something along the lines of �must be magnetic ferrous steel of circular cross section�. I�d expect a Titanium and Carbon Fibre chassis would be very light and rigid, but be prohibitively expensive for negligible performance benefit.
The fundamental rules for a vehicle to be categorised as a kart are; have four wheels, rear wheel drive, with no form of suspension and solid rear axle with no form of differential. If the Carbon Fibre chassis in the USA had suspension then technically it�s not a kart, with Carbon Fibre, Titanuim, suspension, wings and two motors it sounds more like it�s a 2009 regulation F1 car :)
I know of two well known kart manufacturers that produced composite rental chassis, not sure if the first design was fully composite material though. The other design was a single piece of composite for the main chassis, to which the rear axle bearing hangers and a Carbon Fibre front cross member were bolted. The clever bit was that the top of the kingpin bolt mounted through the cross member and the bottom of the kingpin mounted directly to the main chassis. This elegantly simple design gave a low maintenance but very strong kart, which with full wrap around protection was apparently near indestructible.
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