Do I need a special tool to use Suspend?

No. Just your phone, your bike, and a shock pump if you have one. Suspend is built around the dials and air pressures already on your fork and shock. No sensors, no add-ons.

Is it on iPhone and Android?

Suspend is on the App Store for iPhone today. The Android version is in the works: tap the Google Play badge to join the waitlist, and we'll email you the moment it's live.

Does it actually know my exact fork and shock?

Yes. Suspend has tuning models for the major Fox, RockShox, Öhlins, EXT, and Cane Creek units back to 2017: air spring rates, click counts, the works. Pick yours when you set up the bike.

Does it integrate with Strava?

Optionally. Connect once and Suspend can pull in ride hours to roughly track service intervals.

Is the AI suggesting random things?

No. It's constrained to the actual valid range for your damper, ranked against thousands of pro tunes for similar bikes and rider profiles. Every suggestion shows its reasoning.

How much does it cost?

Free for one bike, with generous tuning limits. Pro ($7.99/month or $49.99/year) unlocks unlimited bikes, unlimited AI tuning, photo attachments, Strava and Apple Health auto-sync, multiple tune profiles per bike, and full service history.

What about my data and privacy?

Your bikes, tunes, and ride history are tied to your account and only visible to you, enforced server-side rather than just in the app. We don't sell your data, ever. You can delete your account and everything in it whenever you want.

Free tool · real manufacturer data

MTB suspension calculator

Pick your fork and we’ll show its real published starting pressure for your weight, pulled straight from the Fox, RockShox, Öhlins, Marzocchi, Manitou, and Cane Creek setup charts. None of it is a generic weight formula.

Your fork

Fork travel · mm

Riding weight · you + gear

Riding style

Rear shock

Stroke is the shiny shaft length (42.5, 50, 55, 62.5, 65, 75). Optional — it sets the shock’s sag in mm.

Fox 36

Starting air pressure

86psi

Target sag

24–32mm · 15–20%

Source: FOX 2025 36 charts (ridefox.com)

Rear shock · air

Starting air pressure

~170psi · then set by sag

Target sag

16–19mm · 25–30%

Body-weight pressure is only a start; leverage ratio varies by frame, so dial to the sag target.

Source: Universal Fox / RockShox method

Fork rebound & tokens

From fully closed, back out ~8 clicks (GRIP2 rebound) to start.

Volume spacers: Factory 1 spacer, up to 5.

Set this pressure, then measure sag and adjust. Fork max: 120 psi. The feel comes from riding, and that’s what Suspend tunes from there.

Now tune it to how it actually rides.

Suspend takes this baseline and turns your ride feedback into exact clicks. Free for your first bike.

How to use it

How to set up your MTB suspension

Pump to the starting pressure

Set the fork to the pressure above, and the shock to roughly your body weight in psi. Bounce a few times to equalize the air spring, then settle into your riding stance.

Measure and dial in sag

Push the O-ring to the seal, sit static in riding position, step off, and read the travel used. Adjust pressure until you hit the sag target. Pressure is the start; sag is the truth.

Set rebound, then ride

Set rebound from the guidance above, then ride. How the bike feels over roots, in corners, and off drops tells you what to change next.

What’s inside

Built on published charts, not a formula

Every fork pressure here is transcribed from the maker’s own setup chart: Fox, RockShox, Öhlins, Marzocchi, Manitou, Cane Creek. Forks that run a dual air chamber, like the Öhlins ramp-up or Manitou IRT, show both pressures. Rear shocks work the way manufacturers actually prescribe. No brand publishes a weight-to-pressure shock chart, because the frame’s leverage ratio changes it bike to bike, so you pick your shock for its real sag target, max pressure, and token capacity, then start near body weight in psi and set sag. If your exact model isn’t listed, the generic option still gets you close, and the Suspend app carries data for many more units.

Reference

Fork air pressure charts by model

These are the published starting-pressure charts the calculator draws from, transcribed from each maker’s setup guide. Find your riding weight for a baseline air pressure, then confirm with a sag measurement. Fox notes ±10 psi off the chart is normal.

Fox 32 (Step-Cast) air pressure

Max 140 psi · 15–20% sag

Weight (lb)	PSI
under 130	65
130–140	70
140–150	74
150–160	80
160–170	85
170–180	90
180–190	96
190–200	101
200–210	106
210–220	111
220–230	116
230–240	121
240–250	126

Source: FOX 2025 32 owner’s manual (ridefox.com)

Fox 34 air pressure

Max 120 psi · 15–20% sag

Weight (lb)	PSI
under 130	64
130–140	69
140–150	74
150–160	78
160–170	83
170–180	88
180–190	92
190–200	97
200–210	102
210–220	106
220–230	111
230–240	116
240–250	120

Source: FOX 2025 34 FLOAT chart (ridefox.com)

Fox 36 FLOAT air pressure

Max 120 psi · 15–20% sag

Weight (lb)	PSI
under 130	66
130–140	70
140–150	74
150–160	78
160–170	82
170–180	86
180–190	89
190–200	94
200–210	99
210–220	105
220–230	109
230–240	113
240–250	117

Source: FOX 2025 36 charts (ridefox.com)

Fox 36 Rhythm air pressure

Max 120 psi · 15–20% sag

Weight (lb)	PSI
under 130	55
130–140	59
140–150	63
150–160	67
160–170	72
170–180	76
180–190	80
190–200	85
200–210	89
210–220	93
220–230	97
230–240	102
240–250	106

Source: FOX 2025 36 charts (ridefox.com)

Fox 36 E-Bike+ air pressure

Max 120 psi · 15–20% sag

Weight (lb)	PSI
under 130	71
130–140	76
140–150	81
150–160	85
160–170	90
170–180	95
180–190	99
190–200	104
200–210	109
210–220	113
220–230	115
230–240	117
240–250	120

Source: FOX 2025 36 charts (ridefox.com)

Fox 38 FLOAT air pressure

Max 140 psi · 15–20% sag

Weight (lb)	PSI
under 130	72
130–140	76
140–150	80
150–160	84
160–170	89
170–180	93
180–190	97
190–200	102
200–210	106
210–220	110
220–230	114
230–240	119
240–250	123

Source: FOX 2025 38 charts (ridefox.com)

Fox 38 Rhythm air pressure

Max 140 psi · 15–20% sag

Weight (lb)	PSI
under 130	59
130–140	63
140–150	67
150–160	72
160–170	76
170–180	80
180–190	84
190–200	88
200–210	92
210–220	97
220–230	101
230–240	105
240–250	109

Source: FOX 2025 38 charts (ridefox.com)

Fox 38 E-Bike+ air pressure

Max 140 psi · 15–20% sag

Weight (lb)	PSI
under 130	81
130–140	85
140–150	89
150–160	93
160–170	98
170–180	102
180–190	106
190–200	111
200–210	115
210–220	119
220–230	123
230–240	128
240–250	132

Source: FOX 2025 38 charts (ridefox.com)

Fox 40 (DH) air pressure

Max 120 psi · 15–20% sag

Weight (lb)	PSI
under 165	52–64
165–195	64–76
195–225	76–87
225–260	87–101

Source: FOX 2025 40 chart (ridefox.com) — banded ranges

RockShox Pike air pressure

Max 163 psi · 15–20% sag

Weight (lb)	PSI
under 120	45
120–140	50
140–160	60
160–180	70
180–200	80
200–220	90
220–240	95

Source: RockShox 2023–2026 Front Suspension Spec (sram.com)

RockShox Lyrik air pressure

Max 163 psi · 15–20% sag

Weight (lb)	PSI
under 120	45
120–140	55
140–160	65
160–180	75
180–200	85
200–220	95
220–240	100

Source: RockShox 2023 Spec, Lyrik 150–160 mm (sram.com) — verified

RockShox ZEB air pressure

Max 148 psi · 15–20% sag

Weight (lb)	PSI
under 140	41
140–160	50
160–180	58
180–200	66
200–220	74
220–240	78

Source: RockShox 2023–2026 Front Suspension Spec (sram.com)

RockShox SID air pressure

Max 150 psi · 15–20% sag

Weight (lb)	PSI
under 140	45
140–160	58
160–180	70
180–200	82
200–220	93
220–240	100

Source: RockShox 2026 Front Suspension Spec, SID (sram.com)

RockShox Domain air pressure

Max 148 psi · 15–20% sag

Weight (lb)	PSI
under 140	41
140–160	50
160–180	66
180–200	74
200–220	82
220–240	87

Source: RockShox 2023 Front Suspension Spec, Domain (sram.com)

RockShox BoXXer (DH) air pressure

Max 300 psi · 20–25% sag

Weight (lb)	PSI
under 120	90
120–140	100
140–160	120
160–180	140
180–200	160
200–220	180
220–240	190

Source: RockShox 2026 Front Suspension Spec, BoXXer 190–200 mm (sram.com)

RockShox Recon air pressure

Max 205 psi · 15–20% sag

Weight (lb)	PSI
under 140	60
140–160	78
160–180	93
180–200	110
200–220	120

Source: RockShox 2026 Front Suspension Spec, Recon (sram.com)

RockShox Reba air pressure

Max 165 psi · 15–20% sag

Weight (lb)	PSI
under 100	51
100–120	58
120–140	70
140–160	84
160–180	97
180–200	111
200–220	117

Source: RockShox 2026 Front Suspension Spec, Reba Gold (sram.com)

Öhlins RXF36 m.2 air pressure

Max 250 psi · 15–20% sag

Weight (lb)	PSI	Ramp-up
under 132	75	165
132–154	85	175
154–176	95	185
176–198	105	195
198–220	115	205
220–243	125	215
243–266	135	225

Source: Öhlins RXF36 m.2 Air owner’s manual (ohlins.com)

Öhlins RXF38 m.2 air pressure

Max 250 psi · 15–20% sag

Weight (lb)	PSI	Ramp-up
under 132	75	165
132–154	85	175
154–176	95	185
176–198	105	195
198–220	115	205
220–243	125	215
243–266	135	225

Source: Öhlins RXF38 m.2 Air owner’s manual (ohlins.com)

Marzocchi Bomber Z1 air pressure

Max 120 psi · 18–25% sag

Weight (lb)	PSI
under 115	49
115–135	57
135–155	65
155–175	73
175–195	82
195–215	90
215–235	99
235–250	103

Source: Marzocchi Bomber Z1 chart (via official Ibis setup guide)

Marzocchi Bomber Z2 air pressure

Max 120 psi · 15–20% sag

Weight (lb)	PSI
under 130	58
130–140	63
140–150	68
150–160	72
160–170	77
170–180	82
180–190	86
190–200	91
200–210	96
210–220	100
220–230	105
230–240	110
240–250	114

Source: Marzocchi Bomber Z2 tuning guide (ridefox.com)

Marzocchi Bomber 58 (DH) air pressure

Max 120 psi · 15–20% sag

Weight (lb)	PSI
under 130	49
130–140	53
140–150	57
150–160	61
160–170	65
170–180	69
180–190	73
190–200	76
200–210	80
210–220	84
220–230	88
230–240	92
240–250	96

Source: Marzocchi Bomber 58 tuning guide (ridefox.com)

Manitou Mezzer Pro air pressure

Max 120 psi · 20–25% sag

Weight (lb)	PSI	IRT
under 130	44	79
130–150	52	84
150–170	60	90
170–190	68	97
190–210	75	107
210–240	82	116

Source: Manitou Mezzer Pro Set-Up Guide (140 mm column)

Manitou Mattoc Pro (IRT) air pressure

Max 120 psi · 20–30% sag

Weight (lb)	PSI	IRT
under 140	42	82
140–170	53	93
170–200	65	105
200–220	76	116
220–250	84	124

Source: Manitou Mattoc IRT Set-Up Guide (160 mm column)

FAQ

MTB suspension setup FAQ

Where do these air pressure numbers come from?

Each one is transcribed from the fork maker’s own published chart: Fox owner’s manuals, RockShox spec sheets, and the Öhlins, Marzocchi, Manitou, and Cane Creek setup guides. Pick your fork and the calculator shows that model’s real starting pressure for your weight, with the source noted under the result. It is not a generic weight formula.

Why do I have to pick my exact fork model?

Because a Fox 36, a RockShox Lyrik, and an Öhlins RXF36 all want different pressures at the same rider weight, sometimes by 20 psi or more. A single formula that ignored the model would be wrong for most people. Picking the model is what makes the number trustworthy.

What sag should I run?

For most trail riding, aim for 15–20% sag on the fork and 27–30% on the shock. Cross-country runs a touch firmer, downhill a touch deeper. Sag is how far the suspension settles under your static riding weight, as a percentage of total travel. Set the pressure, then confirm sag by measuring.

Why doesn’t it give a shock pressure for my exact shock?

No manufacturer publishes a weight-to-pressure chart for rear shocks, because the frame’s leverage ratio changes the pressure bike to bike. Even RockShox and Fox tell you to start near your body weight in psi and then set sag by measurement. That’s the method the calculator gives you.

Does riding weight include my gear?

Yes. Use your kitted weight: you plus helmet, shoes, pack, and water. The manufacturer charts are built around fully dressed riding weight.

Will this get me a perfect setup?

It gets you a trustworthy starting point, which is the hard part of a blank setup. The feel comes from riding and adjusting: harsh over roots, wallowing in turns, blowing through travel. That’s what the Suspend app does. You describe the ride, it tells you the click to change and remembers what worked.

Go deeper

Related suspension guides

How to Set Sag on Your Fork and Shock How Rider Weight Affects Suspension Setup Rebound Damping: How to Dial It In Volume Spacers and Tokens: When and How The Complete MTB Suspension Setup Guide

The chart gets you close. Suspend gets you dialed.

A starting pressure is just the first ride. Tell Suspend how the bike felt, whether it was harsh, wallowing, or blowing through travel, and it tells you the exact click to change and remembers what worked on every trail.

Get the app — free

Pressure figures are transcribed from manufacturer setup charts and are starting points, not a substitute for your fork or shock’s own manual. Charts change between model years and trims; always confirm settings with a sag measurement, stay within your suspension’s rated pressure range, and have service done by a qualified technician.