The bicycle is a two wheeled , light weight machine, which is propelled to by human power. It is efficient , cheap, easily manufactured , and one of the world's most popular forms of transport. The first pedal-driven bicycle was built in Scotland in 1839. Since then the basic design - of a frame, wheels, brakes, handlebars , and saddle - has been gradually improved , with the addition of chain , gear system and pneumatic tyres
( tyres inflated with air) has been an important development .With its strong , rugged frame, wide tyres, and 21 gears , a mountain bike enables riders to reach rough and hilly ares that were previously inaccessible to cyclists.
No comments:
Post a Comment