The bike was invented in the 18th century and has undergone many changes and improvements over time. The first appearance of the bike was in 1750 and resembled a "walking machine" with no pedals or handlebars. In 1817, the draisienne was created with a handlebar added. In the 1860s, pedals were added and placed on both the front and rear wheels. The bike continued to evolve throughout the late 1800s with improvements like chains, pneumatic tires, and frames made of metal instead of wood. The modern bicycle was established in 1885 with two same-sized wheels, chains, and other refinements that made it lighter and faster.