A pneumatic spring often used in custom automotive suspension systems. Airbags should not be confused with an airbag, the
crash safety device. Properly installed airbags offer
better ride quality over conventional steel suspension springs and also allow for the adjustment of the vehicle's height, typically from a height where the vehicle chassis is literally laying on the pavement to somewhere near the original ride height of the vehicle.
Airbags
may be installed in search of either low vehicle height, an improvement in ride quality, or a combination of both. They were originally introduced for use on large
semi trucks and city buses, but have gained a large following in the sport
truck and minitruck scenes over the past
15 years.