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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11There is no safe universal PSI number for an e‑mountain bike suspension setup. Start with the exact fork, rear shock and frame instructions, then set sag with your complete riding kit, establish rebound and compression from the manufacturer’s baseline, and make one change at a time on a repeatable trail. Rider weight matters, but frame leverage, air-spring type, travel, riding position and weight distribution determine the pressure that works.
Why rider weight alone cannot determine suspension pressure
Two e‑MTBs ridden by people of the same weight can require different air pressures. A rear shock works through the frame’s leverage ratio, so the pressure at the shock is not a direct equivalent of the pressure in another bike’s shock. Frame progression, shock stroke, wheel travel and where the rider’s mass sits all change the force reaching the suspension.
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RockShox states that suspension setup is specific to the rider, riding style and terrain. Its rear-shock guidance also explains that frame design, leverage ratio and rider-weight distribution affect the required pressure. That is why copying a pressure chart from a similar-looking bicycle, or multiplying body weight by a PSI factor, can produce a harsh, wallowy or unsafe setup.
Use weight as an input to the correct model-specific chart or setup tool, not as a standalone formula. The bike manufacturer’s recommendation is especially important for the rear shock because it accounts for the complete frame-and-shock system.
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Identify the exact suspension and find its baseline
Record the fork and shock
Before touching a pump, write down:
- Fork make, family, model year, travel and air-spring type.
- Rear-shock make, model, model year, air-spring type and stroke.
- Frame model, size, wheel configuration and model year.
- Any volume spacers, tokens or aftermarket air-spring parts already installed.
Look for model markings on the fork crown, lowers and shock body. If the markings are unclear, use the serial-number lookup supplied by the component maker. Then open the current fork manual, shock manual, frame maker’s setup chart or serial-number tool. Record the recommended pressure range, sag target, pressure cap, rebound starting point and compression setting.
Use the bike maker’s rear-shock instructions
A shock pressure that is correct for one frame can be wrong for another even when the shock model and rider weight match. Follow the frame maker’s chart first. If the chart and the shock maker’s generic guidance differ, contact the frame or suspension manufacturer rather than averaging the numbers.
Do not infer settings from appearance
Two forks may share a chassis shape but use different air springs, dampers or travel lengths. Two shocks may have the same eye-to-eye length but different strokes, tunes or mounting hardware. Treat the exact model and configuration as mandatory information, not a detail to check later.
Prepare the bike and rider before measuring sag
Use normal riding weight
Weigh yourself wearing the clothing and protection you normally ride in. Include shoes, helmet, knee or elbow protection, tools, spare tube, water and a hydration pack if you carry them on the trail. A pressure chosen without that load can give a different sag percentage once the equipment is added.
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Prepare the controls
Set the fork and shock’s compression or lockout controls to the manufacturer’s stated open or baseline position. A closed lockout can prevent the suspension from settling and invalidate the measurement. If the manual specifies a particular rebound position for sag setup, use it; otherwise, use the maker’s neutral baseline.
Use the specified riding position
Keep the bike upright on level ground and support it so the suspension can move freely. FOX’s 2026 AWL instructions tell riders to assume their riding position for at least 10 seconds and distribute weight between saddle, handlebar and pedals. Ibis’s Oso guide uses an aggressive standing position. These are not interchangeable rules: use the position named for your own bike and component.
Mount and dismount smoothly. Do not bounce, pull on the handlebar or deliberately compress the suspension before reading the indicator. A bounce adds momentum and makes the apparent sag deeper than the static load would create.
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- Release trapped pressure only as the manual allows. If the fork has a negative chamber or equalization procedure, follow that procedure exactly before setting the main chamber.
- Install a high-pressure suspension pump. Use a pump compatible with the fork’s valve and pressure range. A normal tyre pump is not a substitute, and the pump gauge may show a small pressure loss when disconnected.
- Inflate near the model-specific starting pressure. Use the exact chart or setup tool for your model and rider weight. Never exceed the printed or published maximum pressure.
- Cycle the fork gently. Compress it through a small portion of its travel several times if the manual instructs this, allowing the air chambers to equalize. Do not force the fork to full compression.
- Slide the O-ring to the wiper seal. If your fork uses a rubber indicator, position it against the seal without pushing it down the stanchion.
- Assume the specified riding position. Hold that position for the required time, keep the bike upright and distribute weight as instructed.
- Dismount without bouncing. Step off carefully while leaving the O-ring where the fork settled.
- Measure movement against total fork travel. Convert the O-ring distance to a percentage of the fork’s available travel, using the component’s measurement method.
- Adjust in small pressure changes. More air pressure reduces sag; less pressure increases it. Recycle the fork and repeat the measurement after every change.
If the fork reaches the correct sag only at a pressure outside the published range, stop and investigate the model identification, air-spring configuration, travel setting and gauge. Do not exceed the pressure cap to force a target.
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Set rear-shock sag step by step
- Confirm the frame’s shock pressure and sag procedure. The frame maker may specify a shock indicator position, a percentage of shaft travel or a particular standing posture.
- Open the shock’s compression or pedal mode. Use the baseline position in the manual so the damper does not resist the static measurement.
- Install the high-pressure pump and set the chart value. Confirm the shock’s maximum pressure and the pump’s hose and valve compatibility.
- Equalize the air chambers if required. Some air shocks need several gentle compressions after adding pressure so positive and negative chambers balance. Follow the shock manual rather than guessing.
- Set the shock indicator or O-ring. Place it at the reference position specified by the shock or frame instructions.
- Adopt the prescribed riding posture. A bike may be measured seated, standing or in an aggressive attack position. Keep your normal weight distribution and remain still for the stated time.
- Dismount smoothly. Avoid bouncing or pulling up on the bars, then read the indicator.
- Calculate sag using the shock’s reference length. Some systems use shock shaft movement; others provide a marked indicator. Use the method supplied for your exact model.
- Change pressure in small increments and repeat. Increasing pressure reduces sag; decreasing pressure increases it. Recheck after every adjustment.
If the shock bottoms frequently at the correct sag, do not automatically add a large amount of air. Check whether the frame allows a volume spacer, whether the shock tune is correct and whether compression damping needs adjustment. Any spacer or tune change must be approved for that shock and frame.
Examples of sag targets—and why they are not universal
The figures below are published examples tied to named equipment. They demonstrate the range of legitimate targets; they are not a cross-brand recipe.
| Source and equipment | Published target | Scope and qualification |
|---|---|---|
| FOX 2026 AWL, AWL Sport, AWL HD and AWL HD Sport forks | 15–20% of total fork travel | Applies to those named fork families and their 2026 instructions. |
| RockShox Solo Air rear shocks | 25% sag | Applies to the named Solo Air air-spring type in the RockShox support FAQ. |
| RockShox DebonAir rear shocks | 30% sag | Applies to the named DebonAir air-spring type; the support guidance allows riders to choose within approximately plus or minus five percentage points. |
| Ibis Oso with the documented Bosch/Fox configuration | Fork 18–25%; shock 25–30% | Applies to the Oso configuration described in the Ibis 2023 guide. |
| RockShox TrailHead general guidance | 10–30% of total available travel | A broad guide indicating less sag for shorter travel and more for longer travel; it does not replace a model-specific target. |
Do not put 30% sag in an unrelated fork because a DebonAir shock uses that number, and do not assume an Oso target applies to another e‑MTB. The correct target is the one specified for your exact component and frame.
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Rebound damping controls how quickly the suspension extends after compression. Set it only after air pressure and sag are stable. Start with the manufacturer’s click recommendation, counting clicks from the fully closed or fully open reference exactly as the manual describes. Knob direction is not identical across all components, so verify which way adds or removes damping.
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Symptoms of rebound that is too fast
- The bike feels springy or kicks back after a compression.
- The front wheel or rear wheel skips instead of maintaining contact.
- The bike bounces after a landing or feels difficult to control in a series of bumps.
- The suspension may top out audibly or abruptly.
Add rebound damping one small click at a time, then ride the same feature again. The goal is not the slowest possible return; it is controlled recovery without a bounce.
Symptoms of rebound that is too slow
- The suspension packs down through repeated bumps and sits deeper in its travel.
- The bike feels low and harsh halfway through a rough section.
- The wheel is not ready for the next root, hole or landing.
Reduce rebound damping incrementally so the suspension returns faster. RockShox defines proper rebound as fast enough to return to sag before the next trail feature, but not so fast that the rider and bike bounce and lose traction.
Temperature, altitude, tyre pressure and riding speed can change the feel, so judge rebound on the trail rather than by a click number alone.
Set compression from the baseline, then refine
Compression damping controls resistance as the suspension compresses. Begin at the maker’s open or recommended baseline after sag and rebound are set. Change one control at a time and record the original position.
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Low-speed compression and pedaling support
Low-speed compression influences chassis movement from braking, cornering, pumping and weight shifts. A small increase can reduce excessive dive or wallow, but too much can make small bumps feel sharp and reduce grip. On smoother terrain, a lock or pedal mode may improve pedaling efficiency when the component provides one. Open the control again before descending rough terrain unless the manual specifically permits otherwise.
High-speed compression and larger impacts
High-speed compression is relevant to larger, faster impacts and rough terrain. Ibis describes it in that context. Add only small amounts when the suspension blows through travel or feels under-supported on hard hits; remove damping if the bike becomes harsh and loses traction over square edges. Do not use high-speed compression to compensate for incorrect sag, a wrong air-spring setting or a damaged shock.
Bottom-out support
Using nearly all available travel is desirable. An occasional bottom-out on the biggest impact can be normal, while repeated harsh bottom-outs indicate that the setup needs investigation. First verify sag and riding position. Then consult the component and frame instructions for approved volume spacers, progression settings or compression adjustments.
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Validate the setup on a repeatable trail
- Choose a familiar loop. Use a trail with a climb, braking bumps, repeated chatter, a corner and one or two known impacts. RockShox recommends an easily repeatable trail and several laps.
- Ride a baseline lap. Note fork dive, rear squat, traction, harshness, bottom-outs and whether the wheels stay in contact.
- Change one variable. Work in this order: pressure and sag, rebound, then compression. Do not change fork rebound and shock compression simultaneously.
- Repeat the same line. Use similar speed and body position so the comparison is meaningful.
- Inspect the indicators. Check O-ring or shock-indicator travel after the run. Look for full-travel use and any signs of oil, damage or unusual noise.
- Record the setting. Write down pressure, sag measurement, rebound clicks, compression clicks, temperature and trail conditions.
Make only one or two clicks or a small pressure change per test. A dramatic change can hide the original symptom and make it harder to identify the correct direction.
Terrain-based adjustment framework
| Riding context | What to observe | Possible refinement | What not to assume |
|---|---|---|---|
| Smooth climbs and fire roads | Pedal bob, excessive fork dive and wasted movement. | Use the component’s pedal or lock mode where appropriate, or add a small amount of low-speed compression. | A locked setting is suitable for rough descents; reopen it before demanding impacts. |
| Repeated small chatter | Whether the wheels follow the ground or skip; whether the suspension packs down. | Reduce excessive rebound damping if the suspension cannot recover, or add a click if it rebounds and bounces. | There is no universal “rough terrain equals X clicks” rule. |
| Large square edges and drops | Harshness, sudden bottom-out or loss of travel support. | Check sag first, then consider model-approved high-speed compression or volume-spacer changes. | Adding pressure indefinitely is safe or correct. |
| Long descents with braking bumps | Fork dive, rear-wheel traction and whether the bike rides progressively lower. | Verify rebound is not too slow; make a small low-speed compression adjustment only after sag is correct. | A firm setup always gives more control; excessive damping can reduce grip. |
| Mixed e‑MTB rides with extra battery and cargo load | Changes in sag and chassis balance between loaded and unloaded rides. | Measure with the load you normally carry and keep a separate recorded setting if the load changes substantially. | Your unladen bicycle setting represents your riding weight. |
Troubleshoot common setup problems
The fork or shock will not reach the target sag
- Recheck the model, travel and air-spring identification.
- Confirm the indicator was reset and that you did not bounce while mounting or dismounting.
- Equalize positive and negative air chambers if the manual requires it.
- Check that the pump gauge and valve connection are functioning.
- Verify that a volume spacer or aftermarket air spring has not changed the setup range.
The bike feels harsh despite correct sag
- Check tyre pressure, because tyres are the first part of the suspension system to contact the ground.
- Open compression to the documented baseline.
- Reduce excessive rebound damping if the suspension is packing down.
- Inspect seals, stanchions, shock shaft and hardware for contamination, damage or binding.
The bike feels wallowy or dives under braking
- Confirm sag was measured in the correct posture and with full riding gear.
- Check rebound; a slow setting can leave the suspension deep in its travel.
- Add only a small amount of low-speed compression if the component’s baseline and sag are correct.
- Do not raise pressure far beyond the chart just to eliminate movement.
The suspension bottoms repeatedly
- Inspect the O-ring after a representative ride and confirm the suspension is using the intended travel.
- Verify sag and pressure against the exact frame and component instructions.
- Check whether the shock supports an approved volume spacer or progression adjustment.
- Have a qualified suspension technician inspect the unit if the pressure changes do not produce the expected result.
The bike bounces after landings
Rebound may be too fast. Add damping one click at a time and repeat the same feature. If the problem remains, check that compression, sag and tyre pressure are not masking the symptom.
Tools, limits and service decisions
Minimum useful equipment
- A high-pressure bicycle suspension shock pump compatible with the fork and shock valves and pressure range.
- A small ruler or the component’s sag scale.
- A notebook or phone note for pressure, sag and click settings.
- The current manuals, frame setup chart or serial-number lookup for every component.
Observe the exact pressure limit printed on the component or stated in its manual. A pump’s maximum gauge reading is not permission to exceed the fork or shock’s limit.
When to stop adjusting
Stop riding and seek qualified service if you see oil leakage, damaged stanchions or shock shafts, loose mounting hardware, cracked parts, sudden pressure loss or a control that spins without resistance. If the correct setup remains unclear after confirming the model and following the manual, a bicycle suspension setup or service shop can identify the hardware, check fit and perform a controlled setup.
Quick Recap
A repeatable setup checklist
- Identify the exact fork, shock, air-spring type, frame and model year.
- Find the current component and frame instructions; do not copy a chart from another bicycle.
- Weigh yourself in complete riding gear, including normal water and cargo.
- Set the manufacturer’s starting pressure and equalize chambers as instructed.
- Measure fork and shock sag in the specified riding position without bouncing.
- Respect the published pressure maximum and adjust in small steps.
- Set rebound from the maker’s baseline, then tune for recovery without bounce or packing.
- Set compression from the baseline; use lock or pedal modes only where appropriate.
- Test on a familiar trail, changing one control at a time.
- Record the final pressure, sag, clicks, load and trail conditions.
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