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.
Track frames are built for single speed use with a fixed gear. They have horizontal rear entry drop outs and a higher bottom bracket for clearance on the banking. Over recent years single speeds have seen a surge in popularity, no doubt due to the large amount of couriers using them, many people are adopting single speeds for commuting and training on through the winter months. The fixed gear nature of a single speed teaches you to spin the pedals smoothly on the flat and power over inclines, as there is no hiding on a single speed. You can even find people Time Trialling on them on some of the flatter courses. With a single speed you get a versatile bike suitable for training on through the winter, commuting all year round and then racing at the velodrome on.