Watching the Olympics, I've noticed that track bikes seem to vary between events. For example, in the Keirin, all the riders have bikes with a solid/disc rear wheel and a front wheel that has a solid inner but with gaps. In the Omnium, however, they seem to ride bikes with two complete disc wheels.
Some events also seem to call for aero bars on top of drop bars, some only drops.
I can see that these might affect how the bike handles, and favour either top speed or maneuverability, but, as I only have a basic knowledge of what each track event involves, I am struggling to piece together exactly why each event has its particular combination of components.
Is anyone able to give a run down of how what the features of the bike are for each of the main track events and why those features are ideal for that event?