pursuit bicycle and racer
Pursuit bicycle: bicycle with limited equipment, that is, no brakes, no derailleur (no gears) and no freewheel.
solid rear wheel 
Wheel whose aerodynamic shape allows the cyclist to go more quickly for a given effort.
handlebar grip 
Each of the two low-mounted handle grips that allow the rider to start in the dance position (standing on the pedals).
handlebar 
Grip that extends forward so that the cyclist can ride in an aerodynamic position.
helmet 
Rigid piece of protective equipment for the head that is streamlined for maximum aerodynamics.
seat tube 
Part of the frame leaning slightly to the rear, receiving the seat post and joining the pedal mechanism.