Track bike - a bike designed for cycling . Track bicycles are similar in appearance to road bikes , however, they have a number of fundamental structural differences. The track bike has a shorter wheelbase , which increases the rigidity of the frame. The diameter of the wheels is 622 mm (or 700 according to the ETRTO system ), single-tube bicycle tires are most often used as tires. Due to the inclination of the track web, the carriage assembly of the track bike is located higher, which increases the distance between the extreme lower position of the pedals and the track surface on bends. The tips of the rear feathers of the frame have a special shape in the form of a horizontal cutout, which allows you to adjust the chain tension by changing the position of the axis of the rear wheel. Track bike has only one, so-called. fixed or blind transmission . This means that the pedals do not have free play relative to the rear wheel; they rotate continuously. This effect is achieved due to the absence of a freewheel in the rear wheel hub . The presence of only one gear and the absence of traditional brakes has historically been due to a reduction in bike weight. Braking on a track bike is only possible by gradually slowing down or blocking the pedals .