Originally Posted by cobba

For 2012 models:

DJ1 is lighter then the DJ2 which is lighter then the DJ3

DJ1 20mm axle only
DJ2 20mm axle or 9mm axle
DJ3 9mm axle only

DJ1 Alloy stanchions
DJ2 & DJ3 Steel stanchions

DJ1 Alloy steering tube
DJ2 & DJ3 Steel steering tube

DJ1 & DJ2 Air preload
DJ3 Spring preload

DJ1 & DJ2 adjustable rebound
DJ3 fixed rebound