Superior Engineering now sells the Ride Rite air bags and accessories, Coil Rite air bags and Accessories as well as the On Air Suspension Range. Firestone Ride rite airbags are designed to fit between a vehicles chassis and the axle/ leaf spring to provide a levelling control, front to rear and side to side when a vehicle is under load. Firestone Ride Rite Airbags are a two ply, reinforced rubber bellow. Firestone Ride rite air bags provide extra support for leaf springs in light trucks, vans, 4x4, suv's and caravans. Firestone Coil Rite Airbags are designed to fit inside existing coils springs to provide levelling control to a vehicle when under load. Coil Rite air bags are made of durable Polyurethane. If you have a heavy laden 4x4 then coil rites are definitely recommended. On Air is a full air suspension applied to 4x4's and other vehicles with coil spring suspension. The 4wd coil springs are removed totally and we replace the coil springs with air bags. The 4x4 airbags are a heavy Duty two piece reinforced rubber rolling sleeves, the same construction as used on trucks. You can adjust for varying loads and road conditions by simply inflating or deflating the airbags, just like a tyre.