Suspension is the arrangement of
springs or shock absorbers connecting the axles to the
frame. Suspension works as a shock absorber. When a rider
goes over a bump, the suspension helps the rider from
breaking bones such as the tail bone.
To have suspension or not is an issue
argued about a lot between bicyclists. Doctors believe
that suspension is what has saved many people from
becoming paralyzed and may help people in the long run.
No suspension causes "microtraumas" which are caused by
vibration and jarring movements in the jaw. Many people
agree, but others disagree. It costs more to have
suspension, but it might keep you healthy.
These two pictures show the suspension on a
bike.
Suspension is used normally for short
rides because it gives a more comfortable ride. The
downside to suspension comes in on long rides. It's much
harder to ride uphill or for a long time with suspension
because the bike is heavier and a rider must push down
harder.