Are there different air can options for a more progressive or linear feel? Yes! There are two air can options: Solo Air and DebonAir+. Solo Air is offers a more linear air spring curve, while Debonair gives a more progressive air spring curve. Related articles Can you mismatch the number of positions your SID/ SID SL and SIDLuxe have? For example, is it possible to have a 3P fork and 2P rear shock? What is the difference between the RockShox DebonAir+ Linear air can and Progressive air can? Is the valve stem on SIDLuxe replaceable? Can an older SIDLuxe shock upgrade to 3P?