Dirt Bike Tire Pressure Guide (PSI by Terrain and Weight)
Quick verdict: Start at 12 psi front and 12 psi rear. Drop to 8 psi for sand, raise to 14 psi for rocks. Use heavier-duty tubes or tubliss to run lower pressures without pinch flats.
Starting baseline
| Bike type | Front PSI | Rear PSI |
|---|---|---|
| Full-size MX (250–450) | 12–14 | 12–14 |
| Trail/enduro | 10–13 | 10–13 |
| 125cc / small bore | 11–13 | 11–13 |
| Pit bike | 15–18 | 15–18 |
| Electric e-MX (Sur-Ron) | 15–18 | 15–20 |
| Kids 24V–36V | 20–25 | 20–25 |
Adjust for terrain
| Terrain | Pressure change from baseline |
|---|---|
| Sand / silt | −3 to −5 psi |
| Hardpack / blue groove | baseline |
| Mud (sticky) | −2 psi |
| Rocks / roots | +2 to +4 psi (pinch flat avoidance) |
| Pavement transit | +2 to +5 psi |
Adjust for rider weight
Add 1 psi per 25 lb over 175 lb rider weight. Subtract 1 psi per 25 lb under 150 lb.
Tubes vs Tubliss vs Mousse
- Standard tube: Avoid below 10 psi front, 10 psi rear (pinch flat risk).
- Heavy-duty tube: OK to 8 psi.
- Tubliss / Bib mousse: Run as low as 4 psi for traction.
How to measure correctly
- Cold pressure (before riding)
- Use a digital gauge — analog dial gauges drift
- Measure same gauge every time (calibration consistency)
FAQs
Will lower pressure help on hills?
Yes — more contact patch. Drop 1–2 psi rear.
Does an electric bike need different pressures?
Yes — slightly higher because of battery weight.
How often to check?
Before every ride.