Bike Suspension FAQs: Quick Answers
Intro
This FAQ is for riders who already know the basics and want suspension that performs—whether you're chasing KOMs on rough XC tracks or carrying speed through enduro rock gardens. Read these answers before you tweak pressures or book a full-service; they solve the common setup, maintenance, and compatibility questions that cause the most downtime.
FAQs
How do I set sag on my fork and rear shock?
Set sag as a percentage of travel: fork 15–25% and rear shock 20–30%, tuned by discipline (XC lower, trail/enduro higher). Wear your kit, inflate tires to riding pressure, sit on the bike in riding position, and measure sag after a few gentle bounces. Adjust air pressure to reach target sag. Use volume spacers if you need more progression without raising pressure. Pro tip: Measure sag with your usual kit and a water-bottle filled—small changes in clothing or pack weight shift sag noticeably.
What is rebound and how should I set it?
Rebound controls how fast the fork or shock returns after compression; it keeps the wheel planted and prevents pogo. Start one-third open from the slowest setting, then tune so the bike returns without a second bounce on a 1m log test. If the rear kicks back into your legs, slow the rebound; if it packs down, open it. Common mistake: Setting rebound by feel on pavement—test it on real trail features.
How often should I service my suspension?
Basic lower-leg or air-spring service: ~50 riding hours or annually. Damper/air-cartridge service: ~100–200 hours or annually. Full teardown/rebuild: 200–400 hours depending on use. Race or wet-season riders shorten intervals. If you see oil on stanchions or feel inconsistent damping, book a damper service right away. Safety: Do not ignore oil leaks—ride-stopping failure can follow.
Can I mix forks and shocks from different brands on one frame?
Yes—functionally you can mix brands, but verify travel, shock stroke, eye-to-eye length, mount hardware, and leverage curve compatibility. Geometry and kinematics change with travel and stroke, so confirm the frame’s maximum travel and pivot clearances. When in doubt, consult the frame maker or a qualified shop technician.
Air shock vs. coil shock — which should I choose?
Air shocks are lighter and highly tunable—ideal for trail and XC where weight and adjustability matter. Coil shocks are heavier but offer a more linear springrate, better small-bump sensitivity, and less fade—preferred for aggressive enduro and downhill. Pick coil if you want consistent feel on long, heavy descents.
Why is my suspension making noise or leaking oil?
Oil on stanchions or around seals is a leak—stop riding and service the unit. Creaks and clicks often come from dry pivots, loose hardware, or worn bearings. Clean stanchions, inspect seals for cuts, and check pivot torque. If noise persists after basic checks, have a shop inspect bushings and bearings. Pro tip: Wipe stanchions after every ride and look for nicks—small cuts wreck seals quickly.
What do volume spacers do and when should I add them?
Volume spacers reduce the internal air volume, making the springrate more progressive. They let you run lower pressures for better small-bump sensitivity and reduce bottom-outs on big hits. Add spacers if you’re bottoming frequently or want a firmer end-stroke without a pressure increase.
How should I set compression damping for climbing versus descending?
Use firmer low-speed compression or the climb platform/lockout for seated climbing and sprinting to reduce bob. Open compression for descents to absorb hits—start from the middle of the dial and add 2–3 clicks firmer for climbing, then back off for technical downhill sections. High-speed compression controls big hits; adjust it if you’re harshly bottoming.
Can I change fork or shock travel on my frame?
Increasing travel beyond the frame’s specified maximum risks clearance issues, altered geometry, and warranty voids. Some forks offer travel adjustments within a limited range; shocks can sometimes be reduced in stroke with different hardware. Always confirm frame and fork compatibility before changing travel.
What torque spec should I use on suspension-related bolts?
Use a torque wrench and follow manufacturer specs when available. General safe reference: carbon bars 4 Nm; stem faceplate and seatpost clamp 5–6 Nm. Shock eyelet bolts commonly fall in 8–12 Nm, while pivot bolts vary widely (20–50 Nm). When unsure, consult the part manual or a shop. Safety: Over-torquing pivots strips threads; under-torquing causes creaks and failure.
How much travel should I run for my riding?
Match travel to terrain: XC 80–120 mm, trail 120–140 mm, enduro 150–170 mm, DH 170–200 mm. Longer travel increases capability but adds weight and may slow climbing. Wheel size matters: 29" rolls faster and can benefit from slightly more travel for the same perceived feel.
When is it worth upgrading my fork or shock?
Upgrade when your current unit lacks control, seals fog or you need different travel/character, or when damper tech (like better mid-valve control) will measurably improve your speed or confidence. Prioritize a better damper over small weight savings for aggressive riding.
Key Takeaways
Set sag by discipline: fork 15–25%, rear 20–30%; measure with kit and usual tires.
Tune rebound so the bike returns without a second bounce; use real-trail tests.
Service lower legs ~50 hours, dampers ~100–200 hours; stop riding on visible oil leaks.
Match travel and spring type (air vs coil) to terrain and prioritize damper quality.
Related Blogs
Bike Suspension: Sag, Rebound, Compression & Service Intervals | Competitive Cyclist
Bike Suspension Sag Explained | Competitive Cyclist
Rebound Damping on a Mountain Bike Explained | Competitive Cyclist
How to Set Suspension Sag: Fork & Shock Baseline | Competitive Cyclist
How to Set Mountain Bike Rebound by Feel (Symptoms & Adjustments) | Competitive Cyclist
XC vs Trail vs Enduro: Geometry & Suspension | Competitive Cyclist