Bike weight different from spec sheet
There is some variance in the manufacturers' claimed weight. Due to slight differences in the manufacturing process of the individual components, it is possible that the claimed weight was legitimate. If they weighed the smallest frame available and mated it to the lightest set of the specified wheels, the lightest saddle, etc, they could produce a bike that is lighter than anything that would come down the normal assembly line. Many brands specify that they don't list weights because of these variations. Some brands actually advertise the weight but don't specify the details such as frame size, was the frame painted, was bar tape installed etc.