power train![click to hear](/images/speaker.jpg)
Set of parts (axle, chain wheel, cranks and pedals) transmitting the force exerted by the cyclist on the pedals to the rear wheel.
rear derailleur ![click to hear](/images/speaker.jpg)
Mechanism for changing the rear gears by lifting the chain from one gear wheel to another; it allows the cyclist to adapt to road conditions.
front derailleur ![click to hear](/images/speaker.jpg)
Mechanism for changing the front gears by lifting the chain from one chain wheel to another; it allows the cyclist to adapt to road conditions.
shifter ![click to hear](/images/speaker.jpg)
Lever for changing gears via a cable moving the derailleur.
chain ![click to hear](/images/speaker.jpg)
Set of metal links meshing with the sprockets on the chain wheel and gear wheel to transmit the pedaling motion to the rear wheel.
pedal ![click to hear](/images/speaker.jpg)
Part attached to a crank that the cyclist rotates to provide the bicycle’s power.
crank ![click to hear](/images/speaker.jpg)
Metal part bent at a right angle, supporting a pedal and providing a rotational movement around the pedal’s axle.
chain wheel B ![click to hear](/images/speaker.jpg)
Smaller wheel with sprockets that, in combination with the rear gear wheels, decreases the distance of one rotation of the pedal.
bottom bracket axle ![click to hear](/images/speaker.jpg)
Tube to which the crank is attached at each end so that one end is up when the other is down.
chain wheel A ![click to hear](/images/speaker.jpg)
Larger wheel with sprockets that, in combination with the rear gear wheels, increases the distance of one rotation of the pedal, and therefore the speed of the bicycle.
control cable ![click to hear](/images/speaker.jpg)
Wire made of steel strands transmitting the action exerted on the shifter to each derailleur.
freewheel ![click to hear](/images/speaker.jpg)
Mechanism attached to the rear-wheel hub allowing it to continue turning when the cyclist stops pedaling.
chain guide ![click to hear](/images/speaker.jpg)
Part of the derailleur moving the chain from one chain wheel to the other.
toe clip ![click to hear](/images/speaker.jpg)
Metal device attached to the pedals that covers the front of the feet, keeping the feet in the proper position and increasing pedaling power.
jockey rollers ![click to hear](/images/speaker.jpg)
Small wheels guiding the chain and keeping it taut while changing gears.