After showing virtually no interest in riding a bike, Little Man suddenly started riding a tricycle this spring. So we went out on a limb and told the grandparents to get him a balance bike for his birthday. He had ridden one at a friend's house, but - again - showed no interest in owning one.
We had to buy the taller seat. When we put it together, we tightened it at about the furthest point you could, and waited to see what would happen.
At first, he would ride it around the driveway one time, then go get his trike. A month later, we found a quiet little elbow in the neighborhood behind us, and he could really practice his stuff.
It's the stuff after-dinner-walks-in-the-summer are made of.