An endurance bike, otherwise referred to as a sportive or gran fondo bike, is a bike that has been designed to make long days in the saddle just that little bit easier by providing a more comfortable ride that should not only protect your backside from all the vibrations passing through your seat-post and saddle, but should also keep your legs fresher after multiple hours on the road.
These bikes have become increasingly popular over the last few years for two main reasons. First, the huge growth of sportives and fondos has meant that there are more and more people whose main concern when buying a new bike is that it makes eating up the miles on long rides that bit more pleasant. And second, most people don't get to ride on velvety Swiss roads, and so as to tackle broken tamac and chip seal most riders generally value a bike that is able to take the worst out of rough tarmac.