Suspension
Fork Setup Calculator
Get starting air pressure, sag target, rebound clicks, and compression settings for your Fox or RockShox fork. Values are derived from official manufacturer documentation. Treat them as a starting point and fine-tune by feel on your home trail.
Fork Model
Damper
Travel (mm)
Rider Weight (with gear)
Unit
Riding Style
Volume Spacers
Suggested Starting Air Pressure
--
PSI=
--
barSag Target
--
%
-- mm
Sag Indicator
Damping Starting Points
Rebound
--
clicks from closed
LSC
--
clicks from closed
HSC
--
clicks from closed
Max PSI
--
do not exceed
Suspension
Rear Shock Setup
Calculate starting air pressure and sag for your rear shock. Rear shock pressure is more frame-dependent than fork pressure because of leverage ratio differences. Always cross-check with your frame manufacturer's guide when available. Coil shock spring rate guidance is included.
Shock Model
Rider Weight (with gear)
Unit
Stroke Length (mm)
Riding Style
Starting Air Pressure
--
PSISag Target
--
%
-- mm on stroke
Damping Starting Points
Rebound
--
clicks from closed
LSC
--
clicks from closed
HSC
--
clicks from closed
HBO
--
hydraulic bottom-out
Suspension
Sag Calculator
Sag is how far your suspension compresses under your weight in a normal riding position. Measure with a zip-tie or O-ring on the stanchion. Enter your numbers below to get your sag percentage, or work backwards from a target percentage to find your sag in millimetres.
Measure Sag %
Total Travel (mm)
Sag Measurement (mm)
Target Sag in mm
Total Travel (mm)
Target Sag %
Sag Reference by Brand & Discipline
| Brand / Type | Sag Target | Notes |
|---|---|---|
| Fox Fork (all models) | 15–20% | Official Fox spec. 15% = firm/XC, 20% = plush/enduro. Source: Fox tech.ridefox.com |
| RockShox Fork — DebonAir+ (2023+) | 25–30% | Higher ride height for confidence in steeps. Use TrailHead app for exact starting PSI |
| RockShox Fork — DebonAir / SoloAir | 20–25% | Pre-2023 models, XC forks (SID, Recon, Reba) |
| Fox Rear Shock (air) | 25–30% | Frame-dependent — check your frame maker first. Cycle EVOL chamber 3x after pumping |
| RockShox Rear Shock — DebonAir | 30% | Official SRAM recommendation (support.rockshox.com) |
| RockShox Rear Shock — SoloAir | 25% | Official SRAM recommendation |
| Coil Shock (any brand) | 25–30% | Swap spring rate if you cannot reach target range within 5 turns of preload |
| DH / Bike Park | 30–35% | More sag = more travel in use = better absorption on big hits and landings |
Maintenance
Suspension Service Intervals
A perfectly-tuned fork feels terrible if the seals are dry or the oil has degraded. These are official service intervals from Fox and RockShox documentation. Reduce intervals by 30–50% for very wet, muddy, or dusty conditions, or if you do lift-accessed DH or bike park riding.
Fox Suspension — Official Intervals
| Service | Interval | What It Covers |
|---|---|---|
| Lower Leg Service (fork) | 50 hrs or annually | Drain and replace lower leg oil, clean and re-lube dust wipers and foam rings |
| Air Spring Service (fork) | 125 hrs | Inspect and lube air piston, replace air piston O-rings |
| Full Damper Service (fork) | 200 hrs | Full damper cartridge rebuild, replace seals, fresh fluid |
| Rear Shock — basic | 100 hrs | Wipe seals, inspect for leaks, check and top up air pressure |
| Rear Shock — full service | 200 hrs | Rebuild damper, replace all seals and oil, inspect IFP |
RockShox Suspension — Official Intervals
| Service | Interval | What It Covers |
|---|---|---|
| Lower Leg Service (fork) | 50 hrs or annually | Drain lower leg oil, clean seals, lubricate with Maxima PLUSH Dynamic Suspension Lube |
| Air Spring / Foam Ring Service | 100 hrs | Replace foam rings, inspect air piston, re-lube air spring shaft |
| Charger 3 Damper Service | 200 hrs | Full cartridge rebuild, fresh Maxima PLUSH 7wt (Charger 3) or 3wt (Charger Race Day 2) |
| Rear Shock — basic | 100 hrs | Clean and lube seals, inspect air can, re-check sag |
| Rear Shock — full service | 200 hrs | Full rebuild: IFP, can seals, main piston seals, fresh oil |
Pro tip: A basic lower leg service takes about 30 minutes and transforms small-bump sensitivity. It is the single highest-impact DIY maintenance you can do on any suspension fork. Track hours via your GPS computer — most Garmin and Wahoo units display total ride time.
Service Interval Estimator
Avg Ride Duration (hrs)
Rides Per Week