When can train baby to ride on a bicycle?

Think it depends on how ready your child is. According to my sister, my mother bought me a tricycle when I was two but I did not take to it. Later, I was more than thrilled to learn cycling when I was nine (yes, a little late I know). But never looked back since. I know of friends who started their toddlers around three years old where their sense of balance and coordination are better. :)