SAGLY MTB suspension setup hub
How to Set Up Mountain Bike Suspension
Build a reliable baseline for tire pressure, spring force, SAG, rebound and compression—then improve it one controlled change at a time.
Mountain bike suspension setup can feel complicated because tire pressure, fork pressure, rear-shock pressure, SAG, rebound, compression and front-to-rear balance all influence how the bike behaves. The easiest way to avoid confusion is to follow the correct order, use reliable starting values and change only one variable at a time.
This page is the central SAGLY guide for the complete process. Use it for the overview, then open the focused guides whenever you need detailed instructions for a fork, rear shock, SAG, damping or model-specific setup.
Choose your setup topic
Mountain bike suspension knowledge hub
Follow the full sequence on this page or jump directly to the part of your setup that needs attention.
Quick answer
Start by setting sensible tire pressure. Then set fork and rear-shock spring force, measure SAG, check front-to-rear balance and set rebound. Use compression only after the spring and rebound baseline are close. Test on the same trail section, change one variable at a time and save every useful setup.
Follow the complete setup orderWhy mountain bike suspension setup matters
Suspension does more than absorb large impacts. It affects grip, braking control, comfort, cornering support, stability and how confidently the bike uses its travel. A poor setup can make a capable bike feel harsh, vague or unpredictable.
A useful setup keeps the wheels tracking the ground while giving the rider enough support for braking, pumping, cornering and landing. The goal is not to copy another rider’s PSI or click count. The goal is to build a repeatable baseline for your bike, your weight and your terrain.
The correct order to set up mountain bike suspension
Settings interact with each other. Rebound depends on spring force, while compression cannot compensate for a fork or shock that is far too soft or too firm. Following the correct sequence prevents you from tuning around the wrong baseline.
- Set tire pressure. Create a consistent contact patch before evaluating suspension.
- Set fork and rear-shock spring force. Use air pressure or the correct coil spring rate.
- Measure and adjust SAG. Confirm that both ends sit in a suitable working range.
- Check front-to-rear balance. Make sure the fork and shock support the bike together.
- Set rebound. Adjust return speed only after spring force is reasonably close.
- Fine-tune compression. Add or remove support without hiding a spring problem.
- Test one variable at a time. Use the same short trail section and repeatable pace.
- Save the setup and feedback. Record what changed and whether it improved the ride.
See why each dependency matters in the complete MTB suspension setup-order guide.
Step 1: Set tire pressure first
Tires are the first suspension element between the trail and the bike. Pressure that is too high can create harshness, deflection and poor grip. Pressure that is too low can cause squirm, rim impacts and vague cornering.
Set tire pressure before judging the fork or shock. Use total riding weight, tire casing, rim width, terrain and riding style as inputs, then confirm the result on the trail.
Do not use suspension adjustments to compensate for a tire problem. Start with the SAGLY MTB tire-pressure calculator.
Step 2: Set fork and rear-shock spring force
Air pressure or coil spring rate determines how strongly the suspension supports the rider. Too much spring force can reduce grip and usable travel. Too little can make the bike sit low, dive, wallow or bottom out too easily.
Fork setup
Start with the manufacturer’s pressure recommendation or a reliable personalized baseline. Cycle the fork, confirm travel and measure SAG before moving on to damping.
Follow the complete MTB front-suspension setup guide.
Rear-shock setup
Rear-shock pressure depends strongly on the frame leverage ratio, shock tune and stroke. Use the bike manufacturer’s recommendation where available and verify it with SAG.
Follow the complete rear-shock setup process.
Step 3: Measure SAG correctly
SAG is the amount of suspension travel used under normal riding load. Wear your usual helmet, shoes, pack, water and tools. Cycle the suspension, move the O-rings to the seals and assume a neutral standing riding position.
Many riders use roughly 15–20% fork SAG and approximately 25–33% rear-shock SAG as initial reference areas, but the correct value depends on the bike, shock, terrain and manufacturer recommendation.
Enter your travel or shock stroke and measured movement in the MTB SAG calculator. For the rear shock, calculate SAG from shock stroke—not rear-wheel travel.
Step 4: Check front-to-rear balance
Fork and shock settings should not be evaluated in isolation. The bike needs both ends to support rider inputs and recover at compatible speeds.
Front too soft, rear too firm
- The fork dives heavily under braking.
- The bike feels pitched forward on steep terrain.
- The rear can feel tall or reluctant to use travel.
Front too firm, rear too soft
- The bike can ride nose-high.
- The front wheel may push through flatter corners.
- The rear may wallow or sit too deep under load.
Compare body position, support, grip and travel use under braking, in corners and through repeated bumps. Make small spring-force corrections before moving to damping.
Step 5: Set rebound after SAG
Rebound controls how quickly the fork or shock extends after compression. Higher pressure or a firmer coil spring stores more return energy, which is why rebound should be set after spring force.
Rebound may be too fast when
- The bike feels bouncy or nervous.
- The rear kicks after compressions or landings.
- The wheels skip instead of tracking the ground.
- The fork returns aggressively and unsettles the rider.
Rebound may be too slow when
- The suspension packs down in repeated hits.
- The bike feels dead or sluggish.
- Harshness increases as the rough section continues.
- The suspension cannot recover between impacts.
Learn how to diagnose return speed in the complete MTB rebound guide.
Step 6: Fine-tune compression damping
Compression damping controls resistance to the suspension compressing. Use it after tire pressure, spring force, SAG and rebound are close. Compression is useful for fine-tuning support, but it should not hide an incorrect spring setup.
Less compression may help when
- The bike feels harsh or lacks grip.
- The wheels deflect from roots and square edges.
- The suspension feels over-controlled.
More compression may help when
- The bike dives or wallows despite suitable SAG.
- Support is missing in berms and compressions.
- The bike moves too easily under rider inputs.
Read the low-speed compression setup guide for a deeper explanation of support, sensitivity and rider inputs.
Step 7: Test on one repeatable trail section
Choose a short section with familiar features such as braking bumps, a supported corner, repeated impacts and one larger compression appropriate for your riding level. Use the same line and a similar pace.
- Save the complete baseline before the first run.
- Change only one setting.
- Use small changes, such as a few PSI or one to two clicks.
- Ride the same section again.
- Decide whether the result is better, worse or unclear.
- Restore the previous setting when the result is worse.
One variable at a time. If you change tire pressure, fork pressure and rebound together, you will not know which adjustment caused the result.
Step 8: Document the setup
Record enough information to reproduce the setup later. A useful record includes fork pressure, shock pressure or coil spring rate, SAG, rebound, compression, tire pressure, volume spacers, trail conditions and specific feedback.
Save the original baseline before changing anything. This gives you a safe reference point and prevents a good setup from being lost after several experiments.
Quick troubleshooting by symptom
Most symptoms can have several causes. Use these cards as a first check, then change one variable and retest.
Harsh and low grip
Check tire pressure, excessive spring force, too much compression, rebound packing and service condition.
Diving or wallowing
Check spring force and SAG first. Add low-speed compression only after the spring baseline is close.
Not using full travel
Check pressure, SAG, compression, progression and whether the trail created enough load.
Common mountain bike suspension setup mistakes
- Ignoring tire pressure and blaming the fork or shock.
- Copying another rider’s pressure without checking SAG.
- Setting rebound before spring force.
- Using compression to hide a spring that is too soft.
- Changing several settings at once.
- Testing on different trails or at different speeds every run.
- Counting clicks from an undocumented direction.
- Ignoring fork, shock, bearing or hardware service problems.
- Forgetting to save the original baseline.
FAQ: Mountain bike suspension setup
What should I adjust first on mountain bike suspension?
Start with tire pressure, then set fork and rear-shock spring force. Measure SAG before setting rebound or compression.
How much SAG should a mountain bike have?
Many riders begin around 15–20% fork SAG and approximately 25–33% rear-shock SAG. The correct value depends on the exact frame, fork, shock, terrain and manufacturer recommendation.
Should rebound be adjusted before compression?
Usually yes. Establish tire pressure, spring force and SAG first, then set rebound. Use compression afterward to fine-tune support and sensitivity.
Why does suspension feel harsh even when SAG looks correct?
Possible causes include high tire pressure, excessive compression damping, rebound that is too slow, excessive progression, friction or an overdue service.
Why does the bike feel soft and vague?
Check tire pressure, spring force and SAG first. If these are correct, test a small increase in low-speed compression where available.
Can an app help with mountain bike suspension setup?
Yes. SAGLY can provide personalized starting values, save multiple setups, track changes and help you improve one variable at a time.
Turn your suspension baseline into a setup that improves after every ride
SAGLY helps riders find personalized fork, shock and tire-pressure starting values, save complete bike setups, compare changes and document what felt better or worse.
Stop rebuilding your setup from memory. Keep pressure, SAG, rebound, compression, spacer notes and trail feedback in one place.
Discover the SAGLY mountain bike app
