Marathon Bikes - There's no point buying a super-light marathon bike if it falls apart on the first ride. And on a multi-day marathon, you really need a machine that can hold up. We put the Cannondale Scalpel Carbon 1 to the test.

There are some bikes most people only ever fantasize about about owning. But if you are going to spend a monster amount of cash, you'll want to choose wisely. Here are four of the ultimate superbikes available...