Its called compression and rebound damping adjustment.....the truth be know most those adjustment knobs cause more trubble than they fix as they are not very precise. If you take your basic adjustable damper and put it on a shock dyno( a tool for reading damping of shocks), the amount of damping each knob changes can be very different.....this means to "match" the rebound for a set of say megan's, you may have to turn one knob out 4 clicks and the other 10 clicks and the only way to see this is on a shock dyno.
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