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Tool · PSI calculator

Tire pressure

An advanced starting point for tire pressure. The model accounts for system weight, load split, tire width, rim IRW, casing, terrain, tire system and hookless/TSS limits. Treat the result as a field-test baseline, not a lab measurement.

Front
20
psi·1.38 bar
Load: 45 kg
Effective width: 66 mm
Rear
23
psi·1.59 bar
Load: 54 kg
Effective width: 66 mm
Weight split 45/55 ·tire drop 23% / 26% (Front/Rear) ·effective width 66 / 66 mm
Front · Tuning range
20-23psi
1.38-1.59 bar
Rear · Tuning range
23-26.5psi
1.59-1.83 bar
Front: 20 psi is below the catalog pressure range for Schwalbe Magic Mary (22 psi min). Watch for burping, squirm and rim strikes.

How this PSI was built

Base: 99 kg / 64-64 mm / 30 mm IRW
Tire drop 23% / 26%, effective width 66.0 / 66.0 mm
Base
23/25.5
psi
Casing: Heavy (EXO+, Super Trail) (-6%)
Reinforced casing lets you run slightly lower pressure for grip without losing too much safety margin.
-1.4
-1.5
psi F/R
System: Tubeless (+0 psi)
Tubeless baseline. No tube means no tube pinch-flat risk and lower pressure is possible.
0.0
0.0
psi F/R
Terrain: Mixed (+0%)
Mixed terrain — neutral grip/rolling compromise.
0.0
0.0
psi F/R
Style: Balanced (+0%)
Balanced setup.
0.0
0.0
psi F/R
Priority: Grip / cornering (-7% / -4%)
Lower front pressure for traction and cornering confidence, with a smaller rear drop for rim safety.
-1.5
-1.0
psi F/R
Total — recommended PSI
Front / Rear
Front
20
psi
Rear
23
psi

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Do you measure pressure with the rider on the bike?

No. Measure with the bike standing still and the tire unloaded. The gauge reads the gas pressure inside the tire.

You still enter total system weight because the recommendation targets tire deflection under load.

How it works

This is a transparent starting-point model inspired by tire drop and calibrated to realistic road, gravel and MTB ranges.

  1. System weight is split between the wheels by discipline or by your manual slider.
  2. Nominal tire width is corrected by the internal rim width.
  3. Casing, tire system, terrain and setup character modify the base PSI.
  4. Finally, the model checks hookless/TSS limits, safety floor and catalog tire range.

Typical starting points

75 kg rider, tubeless, neutral setup
DisciplineTire / IRWFrontRear
Road race25 mm / 1972-7878-84
Road endurance32 mm / 2355-6260-68
Gravel42 mm / 2330-3634-40
XC / Marathon2.35 in / 2520-2423-27
Trail2.4 in / 3021-2424-27
Enduro2.5 in / 3020-2323-26
DH2.5 in / 3020-2323-27

These are starting ranges. The final limit always comes from your tire, rim and manufacturer instructions.

Hookless/TSS — the limit depends on tire width

For hookless/TSS, the pressure limit is not one fixed number: 25-29 mm = 72.5 psi, 30-34 mm = 65 psi, 35-39 mm = 58 psi, 40-44 mm = 51 psi. Use only compatible TLR/TLE/TSS tires.

How to find your target PSI

  1. Start from the recommendation and ride a known loop.
  2. If the tire feels harsh and loses grip, drop 1 psi.
  3. If it squirms, burps or hits the rim, add 1-2 psi.
  4. Use the same digital gauge each time; floor pumps can be several psi off.

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