1 bar = 100 kPa exactly, and 1 bar is about 14.504 psi. Tyre pressures are gauge pressure — measured above atmospheric, not absolute.
| psi | bar | bar | psi |
|---|---|---|---|
| 28 | 1.931 | 1.8 | 26.11 |
| 30 | 2.068 | 2 | 29.01 |
| 32 | 2.206 | 2.2 | 31.91 |
| 35 | 2.413 | 2.4 | 34.81 |
| 40 | 2.758 | 2.5 | 36.26 |
| 44 | 3.034 | 3 | 43.51 |
| 50 | 3.447 | 3.5 | 50.76 |
| 100 | 6.895 | 4 | 58.02 |