structural parts for bicycles namely, bicycle frames; tubes and connectors for bicycle frames; bicycle wheels; bicycle superlight wheels; rims and spokes for bicycle wheels; pedals; hubs; quick-release skewers controlled by cam levers for fast-locking and wheel hubs including the same; change-speed gears and front changers; cranks; simple and multiple gears wheels; cranks with gear wheels; gears; free wheels; drive chains; brakes; driving and control means for change-speed gears; front changers and brakes; cable guides; knobs and control levers; pillars and saddles; pumps and pump bearings; pins and bearings for cranks and pedals; steering knuckles and bearings and bushes thereof; front and back forks; cables and sheathes; fastening clips; handle-bars and handle bar connections; tires and tubular tires; all the aforecited goods for bicycles