Air springs are available in many different types. There's the double convoluted, tapered sleeve and rolling sleeve. LK Performance stocks all of these types so that you can select the correct BMW air suspension for your vehicle. The double convoluted variation allows for greater load capacity making it an ideal choice for commercial vehicles and has a more progressive spring rate most suitable for front suspensions. The tapered and rolling sleeve BMW air suspensions for cars or vans are smaller with a longer stroke and are more suitable for the rear of the vehicle and are generally unsuitable for the commercial vehicle as they are not load bearing.