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Since there is more rubber interfacing with the surface, an underinflated tire will have more traction. In drag racing, where the fastest acceleration and speed is needed over a 1/4 mile distance, "slicks" are used for the most traction. Slicks are flat, without tread and are made of a softer rubber to give maximum traction. Motorcycle tyres also take advantage of this, especially the "crotch rocket" type that Italians love to race on their winding roads - and often get killed thereby.A motorcycle racing tire can be seen in this example from http://www.webbikeworld.com/Motorcycle-racing/news/2008-world-superbike-kagayama.htm
But what's the answer - a flat tyre or a hard tyre in terms of traction?