Rebound & Compression Basics
Understand the fundamentals of suspension damping — what rebound and compression do, how to set them, and simple tuning steps to improve control and traction.
Overview
What is Rebound?
Rebound damping controls how quickly the suspension extends after compression. Too fast = uncontrolled bounce; too slow = packing and traction loss.
What is Compression?
Compression damping resists shaft movement when the wheel hits an obstacle. It affects how the bike handles big hits and how progressive the feel is.
Key Tuning Goals
Balance comfort, traction and chassis control. Aim to keep wheels in contact with the ground while preventing harsh bottom-outs or excessive pogo.
Tools & Consumables
Shock pump, sag meter or ruler, small screwdriver or knob access for click adjustments, notebook to record settings, and patience.
Tip: Make one change at a time and test a consistent trail feature to evaluate effects.
Step-by-Step Tuning Workflow
Use a shock pump and measure sag per manufacturer recommendations (typically 20–30% for forks and 25–35% for rear shocks). Sag sets the baseline for damping adjustments.
Begin with recommended rebound and compression click settings. Record them so you can return if needed.
Adjust rebound in small steps. If the bike feels pogo-y or bucks, increase rebound damping (slower). If it feels harsh and doesn't recover, decrease rebound (faster).
Low-speed compression affects braking and pedaling stability. Add damping to reduce nose-dive or wallow; soften for better plushness and traction.
High-speed compression handles sharp impacts. Increase it to prevent bottom-outs on big hits; decrease for a more forgiving feel over chattery terrain.
Ride the same feature several times, make incremental changes, and only change one parameter at a time to isolate effects.
Common Mistakes
Show / hide common mistakes
- Skipping sag setup – Damping adjustments are meaningless without correct sag.
- Big jumps between changes – Large changes mask cause/effect and can make the bike feel worse.
- Confusing compression types – Low- and high-speed compression serve different purposes; tune them independently if available.
- Ignoring tire pressure and geometry – Suspension behavior interacts with tires and bike setup; consider these when diagnosing issues.
Practical Tuning Tips
- Make notes: log click counts and conditions so you can return to a known baseline.
- Test on a consistent feature (drop, rock roll, rooty section) to compare settings reliably.
- If unsure, err on slightly firmer rebound to avoid packing; you can always soften incrementally.
- Use sag and rebound tests on the bike stand and on a short test lap before committing to long rides.
Quick Practice Routine
Start: set sag (10 min). Baseline: apply manufacturer damping settings and ride a test loop (10–20 min). Tune rebound and low-speed compression with small changes and retest (20–40 min). Finalize high-speed compression on bigger hits (10–30 min).
Trail-Side Suspension Tips
- Carry a shock pump for quick sag adjustments if conditions or load change.
- If the bike feels wallowy after long descents, add a couple clicks of low-speed compression or bleed air (for air-sprung shock) as appropriate.
- Keep a small notebook or phone photo of click positions before big changes so you can revert.
Checklist
- Sag set correctly
- Baseline click counts recorded
- Shock pump available
- Test feature identified for tuning
Set sag → Start from manufacturer clicks → Tune rebound & compression → Re-check & iterate
Where to Go Next
See our Checking Brake Pads & Rotors guide for maintaining optimal braking performance.