MTB Tire Pressure Calculator
Enter your weight, tire width and trail roughness for a personalized starting front and rear PSI and BAR — 29er, 27.5" and 26" wheels, any tire brand.
Baseline Tire Pressure at 80 kg Total System Weight
61mm (2.4") measured tire width · 29er (700C) wheels · high-performance tubeless · fast singletrack pace
| Trail Roughness | Front PSI / BAR | Rear PSI / BAR |
|---|---|---|
| Cat 1 — Smooth Trail / Hardpack Doubletrack | 17 PSI (1.2 BAR) | 18 PSI (1.2 BAR) |
| Cat 2 — Flow Trail / Moderate XC Singletrack | 15.5 PSI (1.1 BAR) | 16.5 PSI (1.1 BAR) |
| Cat 3 — Technical Trail / Rocky & Rooty Singletrack | 13.5 PSI (0.9 BAR) | 14.5 PSI (1 BAR) |
| Cat 4 — Chunky Rock / Enduro & Downhill | 12.5 PSI (0.9 BAR) | 13.5 PSI (0.9 BAR) |
Get Your MTB Tire Pressure
Enter your total system weight, measured tire width, trail roughness and casing type. The calculator applies the 46.5/53.5 MTB front/rear split automatically.
How to Use This Calculator
1Enter Your Total System Weight
Add up your body weight, bike weight and any gear you'll be carrying. Enter it in pounds (lbs) or kilograms (kg).
2Select Trail Roughness
Choose Category 1 (smooth, fast doubletrack) through Category 4 (chunky, rocky terrain) for the trail you'll actually be riding.
3Measure Your Tire Width
45–65mm (roughly 1.8"–2.6"), from fast XC tires to standard trail/enduro widths. Measure the tire's actual inflated width, not the label.
4Choose Wheel Diameter & Tire Type
Select 29er, 27.5" or 26", then your casing: high-performance, mid-range or puncture-resistant tubeless, or a butyl-tube setup.
5Set Average Speed
Pick the pace closest to your riding style. Weight distribution is fixed at 46.5/53.5 front/rear for MTB, the most rear-biased split this calculator handles.
6Calculate & Use Your Results
Get a personalized starting front and rear PSI and BAR in one click, then copy or share the numbers.
How MTB Tire Pressure Works
MTB tire pressure runs far lower than road or gravel because wide, high-volume tires need very little air to support rider weight. The limiting factor is traction, rim protection and pinch-flat risk, not rolling resistance alone. The SILCA methodology behind this calculator balances those factors against your weight, tire width and trail roughness — a starting point for testing, not a fixed answer, and one where real-world validation matters most given how low the numbers can get.
MTB tire pressure by width (80 kg total system weight, Category 3 rough trail, 29er, high-performance tubeless)
| Tire Width | Front PSI | Rear PSI |
|---|---|---|
| 56mm (2.2") | 17.5 | 18.5 |
| 58mm (2.3") | 16 | 17 |
| 61mm (2.4") | 13.5 | 14.5 |
| 65mm (2.6") | 11 | 11.5 |
Starting-point reference only — use the calculator above for your own weight and setup, then adjust based on feel and trail-tested experience.
Does casing type change MTB tire pressure?
It does, but not strictly along tubeless-vs-tubed lines. The Tire Type input is a casing-quality spectrum: high-performance tubeless casings are the most supple, so they compute the highest starting pressure. Puncture-resistant tubeless casings are stiffer and heavier for durability, so they compute a lower number, at 13 PSI rear versus 14.5 PSI rear for the same 80 kg / 61mm / Category 3 setup — at or below a butyl tube at 13.5 PSI rear, despite the puncture-resistant option also being tubeless. What going tubeless actually buys you is removing inner-tube snakebite risk, which is what lets most riders safely test a low baseline in the first place — a tubed tire at the same low pressure carries real pinch-flat risk on rocks and roots. This calculator's pinch-flat warning will flag a tubed setup that's pushed too low for its width.
Front vs. rear on MTB
MTB bikes carry the most rear-biased weight split this calculator handles, roughly 46.5/53.5 front/rear, so the rear tire runs about 1 PSI higher than the front at the same tire drop. This calculator applies that split automatically to every result.
MTB pressure considerations
- Wider rims support a tire better at the same pressure, so rim width is worth checking alongside tire width.
- Include your hydration pack and gear in the total weight you enter, not just your body weight.
- 29er vs. 27.5: a larger wheel at the same tire width generally computes slightly lower pressure, which the wheel-diameter input already accounts for.
- Trail type over trail name: a rocky, root-heavy climb and a smooth flow trail on the same ride can call for different categories.
- Inserts, casing and riding style all shift the safe minimum in ways this calculator can't see — treat low computed numbers as a first test, not a target to chase.
Running tubeless? See how casing tier shifts your starting pressure on the tubeless tire pressure calculator.
If you are riding a drop-bar bike on smooth dirt roads and light gravel, switch to the gravel bike tire pressure calculator.
Need track surfaces or triathlon weight distribution? Use the full SILCA tire pressure calculator.
Frequently Asked Questions
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