MTB Suspension Troubleshooting Guide
Diagnose common mountain bike suspension problems like bottoming out, harsh mid-stroke feel, packing down, brake dive, pogo rebound, poor traction, and not using full travel.
Open the suspension calculator Check component service notes Find rebuild kits / partsService before setup: If the bike suddenly feels worse, needs unusual settings, feels sticky, makes noise, leaks oil or air, or adjusters stop making a clear difference, it may need service rather than more tuning. Check service condition before changing pressure, spring rate, rebound, compression, or volume spacers.
Order of operations: service/inspection first, then pressure or spring rate and sag, rebound second, compression third, volume spacers/tokens last. Small changes are best: 2-5 psi / 0.1-0.3 bar, 1 click of damping, or one spacer/token step.
Common suspension symptoms and first adjustments
This table is the full troubleshooting flow from the Easy Sus calculator, moved here so this real page has the complete reference instead of sending visitors back to a duplicate homepage section.
| Problem | First adjustments | Volume / balance notes |
|---|---|---|
| Service needed / suddenly worse feel | If the fork or shock suddenly feels sticky, harsh, noisy, inconsistent, loses pressure, rebounds unpredictably, or needs big setting changes to feel normal, stop chasing clicks first. Inspect for air loss, oil leaks, bushing play, damaged seals, dirty stanchions, or overdue service. | Check the Component Database for the service intervals and service type for your exact fork or shock. If you need seals, oil, air-can kits, damper parts, or tools, check Interested In New Gear? for parts/rebuild links as they are added. |
| Bottoms out too easily | Confirm sag first. Add 3-5 psi / 0.2-0.3 bar or move to a firmer spring. Add 1 click HSC or single compression if available. Add 1 click LSC only when the problem is G-outs/wallow, not square-edge harshness. | Add one spacer/token only after sag and HSC are correct. On RockShox products, Bottomless Tokens are the last step after HSC. |
| Never uses full travel | Drop 3-5 psi / 0.2-0.3 bar. Open HSC 1-2 clicks. Open single compression 1-2 clicks. If it still never reaches travel with correct sag, remove one spacer/token. | After lowering pressure, speed rebound up 1 click because the spring has less energy. |
| Harsh in mid-stroke | Open LSC 1-2 clicks and HSC 1 click. Check pressure/sag. If sag is correct but the bike feels like it ramps too early, remove one spacer/token. | Do not fix mid-stroke harshness by only slowing rebound; slow rebound can cause packing and make harshness worse. If harshness appeared suddenly, check service condition first. |
| Brake dive / wallow / too much chassis movement | Add 1-2 clicks LSC or move the compression lever toward medium/pedal. Add 2-3 psi if sag is too deep. | Volume spacers affect later travel; use LSC/pressure first for dive. |
| Packs down on repeated hits | Speed rebound up 1-2 clicks. On most FOX-style outputs that means more clicks out from closed. On RockShox icons it means toward the jackalope/fast direction. | Open HSC/LSC 1 click if repeated square edges still feel harsh after rebound is fixed. If rebound changes no longer feel consistent, service may be needed. |
| Too bouncy / tops out / bucking | Slow rebound down 1-2 clicks. On most FOX-style outputs that means fewer clicks out from closed. On RockShox icons it means toward turtle/slow. | If only the rear kicks, slow rear rebound first; if only the fork skips up, slow fork rebound. |
| Deflects off roots or square edges | Open HSC 1-2 clicks or open single compression. Check tire pressure and fork/shock pressure. Too much LSC can also make the bike ride high and deflect. | Remove one spacer/token if sag is correct but mid/end-stroke ramps up too abruptly. Sticky lowers, dry seals, or contaminated oil can also cause deflection. |
| Too low / pedal strikes / lacks support | Add 3-5 psi / 0.2-0.3 bar or move to a firmer spring. Add LSC 1-2 clicks for chassis support. Add HSC only if hard impacts are using travel too quickly. | For rear shocks, frame leverage matters a lot; use the rear wheel travel input and verify sag at the shock and wheel. |
| Needs more traction / grip | Try slightly less pressure, faster rebound if it feels dead, and less HSC if it skips across impacts. Keep front and rear balanced. | Do not reduce pressure so much that sag becomes excessive or the bike rides too low. Fresh seals/oil often restore traction better than excessive setup changes. |
| Jump / park support | Add a small amount of pressure, add 1 click HSC, and consider one spacer/token if bottom-outs continue with correct sag. | Keep enough rebound control to avoid bucking on takeoffs and landings. |
How to make changes without getting lost
Change one thing at a time
Do not change pressure, rebound, compression, and volume spacers all at once. Make one small change and repeat the same trail section.
Keep front and rear balanced
If the fork feels calm but the rear kicks, work on the rear first. If the fork skips or rides too low, work on the fork first.
Return to baseline
Write down your starting pressure, sag, rebound, compression, and spacer count. If a change does not help, go back before trying the next step.
Direction note: The calculator preserves each brand's wording. FOX-style values are usually clicks from closed or open as labeled; RockShox Charger 3 / 3.1 style compression uses plus/minus positions from the middle. Always follow the label shown in the quick-look card or product manual.