Tyre pressure calculator MTB, e-MTB, gravel, road, touring & city
The right starting pressure front and rear – based on your weight, tyre and rim width, tubeless or inner tube, and the terrain.
How the calculator works
- Weight distribution: the rear wheel carries more load (road about 58 %, gravel 57 %), so rear pressure is higher.
- Tyre width: a wider tyre carries the same load at much lower pressure – for gravel and road tyres, pressure falls roughly with the square of the width.
- Rim width: every extra millimetre of internal rim width makes the tyre about 0.4 mm wider, so wider rims allow slightly less pressure.
- Setup and terrain: inner tubes need more pressure (pinch-flat protection), inserts a little less. On rough surfaces, lower pressure reduces rolling resistance and adds grip.
- MTB and e-MTB: casing and riding style also count; the calculator uses the same starting values as our suspension calculator.
Gravel tyre pressure chart
Tubeless, 25 mm internal rim width, mixed terrain, 10 kg bike. Values front / rear in bar.
| Rider | 35 mm | 40 mm | 45 mm | 50 mm |
|---|---|---|---|---|
| 60 kg | 2.3 / 2.533 / 37 psi | 1.8 / 2.026 / 29 psi | 1.5 / 1.621 / 23 psi | 1.3 / 1.319 / 19 psi |
| 70 kg | 2.6 / 2.938 / 42 psi | 2.0 / 2.230 / 33 psi | 1.6 / 1.824 / 26 psi | 1.4 / 1.520 / 22 psi |
| 80 kg | 2.9 / 3.242 / 46 psi | 2.3 / 2.533 / 36 psi | 1.8 / 2.027 / 29 psi | 1.5 / 1.722 / 24 psi |
| 90 kg | 3.2 / 3.546 / 51 psi | 2.5 / 2.836 / 40 psi | 2.0 / 2.229 / 32 psi | 1.7 / 1.824 / 27 psi |
| 100 kg | 3.5 / 3.850 / 55 psi | 2.7 / 3.039 / 43 psi | 2.2 / 2.432 / 35 psi | 1.8 / 2.026 / 29 psi |
Road tyre pressure chart
Tubeless, 21 mm internal rim width, smooth tarmac, 8.5 kg bike. Values front / rear in bar.
| Rider | 25 mm | 28 mm | 30 mm | 32 mm |
|---|---|---|---|---|
| 60 kg | 4.9 / 5.571 / 79 psi | 3.9 / 4.356 / 63 psi | 3.4 / 3.849 / 55 psi | 3.0 / 3.344 / 48 psi |
| 70 kg | 5.5 / 6.280 / 89 psi | 4.4 / 4.964 / 71 psi | 3.8 / 4.355 / 62 psi | 3.4 / 3.849 / 55 psi |
| 80 kg | 6.1 / 6.989 / 100 psi | 4.9 / 5.571 / 79 psi | 4.3 / 4.862 / 69 psi | 3.7 / 4.254 / 61 psi |
| 90 kg | 6.8 / 7.698 / 110 psi | 5.4 / 6.078 / 87 psi | 4.7 / 5.368 / 76 psi | 4.1 / 4.660 / 67 psi |
| 100 kg | 7.4 / 8.3107 / 120 psi | 5.9 / 6.685 / 95 psi | 5.1 / 5.774 / 83 psi | 4.5 / 5.065 / 73 psi |
Hookless rims: 5 bar (73 psi) maximum
Hookless rims hold the tyre without a hook on the rim wall. Under the ETRTO standard they are limited to 5 bar (72.5 psi), and only approved tubeless tyres may be fitted. If your calculated pressure is higher, the right answer is a wider tyre – not more pressure.
FAQ
What tyre pressure do I need on a gravel bike?
With 40 mm tubeless tyres and a system weight of around 80 kg, typical starting values are about 2.0 bar (29 psi) front and 2.3 bar (33 psi) rear. Heavier riders, narrower tyres or inner tubes need more; wider tyres and loose terrain need less.
Why less pressure at the front than at the rear?
Because the rear wheel carries more weight. At the same pressure the front tyre would be too hard, lose grip sooner and roll worse on rough ground.
Does the calculator work with inner tubes?
Yes. Choose “inner tube” or “latex tube” and the calculator adds a little pressure to prevent pinch flats.
How accurate are the values?
They are starting values. Tyre construction, rims and personal preference differ. Start with the calculated pressure and adjust in small steps – the manufacturers’ minimum and maximum pressures always take priority.