Track bikes come with a fixed sprocket which provide you with the most efficient and direct transmission available. On track bikes you cannot freewheel or coast as the sprocket is directly fixed to the hub.
Track bikes are minimalistic in design and as a result are cheap, light and easier to maintain than their geared equivalents. Aesthetically they often come with an alternative design or paintwork and this really makes them stand out from the crowd.
When purchasing your track bike it's essential that you select the right size. Sizing conventions do differ between manufacturers so it's important to read the size chart of the frame as well as making sure the top tube reach provides you with the right fit. Another factor to consider is the bike's material; track bikes can be constructed from carbon fibre, steel, aluminium or titanium.