The bike is the most ecological and healthy form of transport that man has invented. Nowadays,in the world there are eight hundred millions of bikes, twice as much as cars. In Asia, millions of people are carried by bikes everyday. Nevertheless, in western countries, the popular "bikes" are used, especially, to do sport.
Pierre Michaux put the two pedals on the front wheel, and it forced him to make this wheel bigger (up to two metres in diameter), to get a balance speed.
Moreover, to offer less resistance to the air, the bikes have aerodynamics profiles, low handlebars and lenticular wheels.
-Mountain bikes: the frame is strengthened and the wheels are expanded,
with the goal of going by through rough lands.
attached to a wide handlebar and thick wheels, to be able to perform acrobatic jumps, wherever.
they are in full effort. New materials have halved the weight of this bikes!
They are adapted to circulate cormfortably through the streets. They have light and a boot.
which can go into the baggage, for example.
The pedals on a tandem are connected so that they revolve around the hub in unison. Tandems come in four subcategories: mountain, road, hybrid, and recumbent. These bikes feature the same characteristics as their namesake, but they're built for two riders
-Solar bikes: This futuristic model may become a serious alternative for the people who always go by car through the streets. This type of bike works with photovoltaic cells on the top of the bike.