Dear Confuddle of Berkshire.
Short version.
Charger 2 damper
This is RockShox current range-topping damper. It’s a fully sealed unit that uses a bladder to keep the damping oil isolated from the air. It’s available in different formats depending on the application, but the three main specs are the basic RC with adjustable rebound and low-speed compression to lockout, the RCT3 with three position compression setting from lock-pedal-open with low-speed compression adjustment in the open mode and the RC2 which gets high and low-speed adjustable compression damping plus rebound. The latter is only seen on dedicated gravity forks.
Charger 2.1 damper
This is an updated version of the Charger 2 damper seen on ‘Ultimate’ forks with some changes to the valving, such as less high-speed compression damping and more low-speed compression damping to make the fork sit up high in its travel.
There is also a new piston wear band inside the damper which is said to better manage oil flow, while a new rod seal from SKF is claimed to reduce friction by upwards of 30% at the rebound shaft.
It is available in RC2 and RCT3 versions, with the same differences in adjustment as the regular Charger range.
Motion Control
This is the mid-range damper and it comes in a few different formats. All are emulsion dampers, where the damping oil isn’t separated from the air in the fork, which can lead to less precisely controlled damping when the two materials mix -become an emulsion – under more extreme use. Not having the damping oil under any positive pressure – as it is in a sealed damper – can lead to loss of damping control due to cavitation as well, though this is rare.
Debonair spring
This is the premium air spring that RockShox offers. It uses a higher volume self-balancing negative air spring relative to the standard Solo Air design to offer reduced breakaway force for better small bump compliance and a more linear starting stroke.
Dual Position Air spring
This is an air spring that allows you to externally adjust the travel by up to 30mm, depending on the fork.
Solo Air spring
This is the standard air spring seen on RockShox forks. It’s called Solo air because you only need to add air to a single valve and the spring will equalise the negative chamber by itself. At one point, they had a Dual Air spring that required you to do this via a second valve, hence the name.
Turn Key damper
This is the most simple and hence affordable damper seen on RockShox forks. It’s a basic emulsion damper.
I copied that to my local machine, for my own reference. I got it from a longer article in one of the magazines – I just can’t remember which one -sorry. If you copy a bit verbatim and paste it not Google the original will probably come up, since I cut and paste it verbatim.