Compression shortens the damper; rebound extends it.
Conceptual movement. Hardware and adjustment vary by kit.
Start with the control layout
Dampers resist suspension movement. Compression is the damper shortening; rebound is it extending again. A combined adjuster changes both through one control. Separate adjustment gives you more choices, so check what each dial changes before comparing the number of clicks.
What the extra ways mean
BC Racing describes its ER range as separate compression and rebound adjustment. Its ZR range splits compression into low-speed and high-speed adjustment, alongside rebound. Here, speed means damper shaft movement, not the speed on your dashboard. Those are range descriptions: the exact kit page still needs to match your application.
Choose a setup you can use
For a road car, tell us which roads you drive and what you want to change about the present setup. For track use, include tyres, car weight changes and how often you will adjust the car. More adjustment adds setup work; a click count does not tell you how one brand will ride compared with another. Start from the instructions supplied with your exact kit and record any changes.
Technical references
Reviewed 24 October 2026. Manufacturer material may cover other markets or applications. Confirm the specification supplied for your UK kit.