a mechanical device using confined air to absorb the shock of motion 
                                                            
                                                     
                        
                                                
                        
                        
                            High pressure air reservoir used in a suspension fork or shock. Generally considered to be lighter, but not as plush as coil springs.
                                                            
                                                     
                        
                                                
                        
                        
                            A flexible air-inflated chamber in which the air pressure is controlled and varied to support the load and absorb road shocks; formerly called air bag.