Here is my take. You either go long and longer. Or wide or wider. I personally find the middle range focal length, like 50mm to 100mm on a crop body not "dramatic" enough to create good shots. If the focal length is not long enough, you don't get the necessary background isolation. When you need to show more of the background, the ambient and the crowd, the middle focal length does not have the necessary DOF.
I generally carry my Sigma 17-50 and Nikon AF D 80-200 when I shoot cycling races.
This. I shoot motorsports and my most used combo of lenses on a pair of 7D is 10-22 and 70-200.