Bicycles are inherently stable because of their geometry. The
geometry causes the bicycle to always turn into the direction it
begins to lean, which keeps it upright. The reason is best
illustrated through a concept known as counter-steering. Counter
steering is how all two wheel vehicles turn. When you want to
turn towards the left, you turn the handlebars a little to the
right. The friction of the wheels pulls the bottom of the bike
towards the right, which initiates a lean towards the left. The
handle bars then begin to swing towards the left to track
through the turn. When it's time to stop the turn, you turn the
handlebars a little more to the left. That pulls the bottom of
the bike further towards the left, which brings the bottom of
the bike directly under the center of gravity and thus stopping
the turn. On many bikes and at low speeds, the counter steering
effect can be unnoticed by many riders. However, at high speeds,
or with heavier vehicles such as motor cycles it is more
significant. So, how doe