TejanoTrackie 

The length of a frame's top tube is more important than the seat tube when determining proper size. Manufacturer's use the seat tube length to define frame size, and use standover clearance as the criteria for sizing. This does not take into consideration the rider's torso and arm lengths, which are more important in determining proper body position on the bicycle. Some frames like the Kilo WT tend towards long top tube lengths, so you might be better off with a 49 cm to get the correct fit. Since the 49 cm Kilo WT has a sloping top tube, you will have the same saddle to bar drop as the 53 cm frame. Compensating with either a very long or very short stem is not a good solution, because it will place your weight either too far forward or rearward, which affects steering. Typically, the sweet spot for stems coupled with drop bars is between 80cm and 120cm. I suggest you look at a bicycle sizing calculator to see what frame dimensions are optimal for you.