255/45R19 · SUV / crossover · Bar
Recommended bar for 255/45R19
- Size
- 255/45R19
- Class
- SUV / crossover
- Planning PSI
- 36
- Planning bar
- 2.48
bar
2.48
36 psi · 248 kPa · not a second factory sticker
255/45R19 · 36 psi · 2.48 bar · 248 kPa — estimates. Placard wins.
European stickers print bar. 255/45R19 often sits near 2.48 bar on a SUV / crossover (36 psi / 248 kPa). 2.48 bar is not “36 divided by ten”. 19-inch SUV plus-size. These rows are estimates interpolated for the size, not OEM for a named VIN.
Bar, PSI and kPa
1 bar ≈ 14.5 psi; 1 psi ≈ 6.89 kPa. Planning midpoint for 255/45R19: 36 psi = 2.48 bar = 248 kPa.
| Bar | PSI | kPa |
|---|---|---|
| 2.21 | 32 | 221 |
| 2.28 | 33 | 228 |
| 2.34 | 34 | 234 |
| 2.41 | 35 | 241 |
| 2.48 | 36 | 248 |
| 2.55 | 37 | 255 |
| 2.62 | 38 | 262 |
| 2.69 | 39 | 269 |
| 2.76 | 40 | 276 |
| 2.83 | 41 | 283 |
| 2.90 | 42 | 290 |
| 2.96 | 43 | 296 |
| 3.03 | 44 | 303 |
| 3.10 | 45 | 310 |
| 3.17 | 46 | 317 |
| 3.24 | 47 | 324 |
| 3.31 | 48 | 331 |
Estimated 255/45R19 pressure by load
These 255/45R19 load steps are ± a few PSI from 36. They are not a licence to ignore a printed second column on a van or estate.
| Condition | Front (est.) | Rear (est.) |
|---|---|---|
| Driver only / unladen | 36 psi / 2.48 bar / 248 kPa | 37 psi / 2.55 bar / 255 kPa |
| Typical occupancy | 36 psi / 2.48 bar / 248 kPa | 38 psi / 2.62 bar / 262 kPa |
| Motorway + luggage (sketch) | 37 psi / 2.55 bar / 255 kPa | 39 psi / 2.69 bar / 269 kPa |
Placard versus sidewall
If a forum says “all 255/45R19 run 36 psi”, ignore it. A Qashqai and a Golf can share a size and not share a sticker.
What 255/45R19 means
Read 255/45R19 as width / aspect R rim. Nothing in the size string is a pressure. Pressure lives on the car, not moulded as 205 or 55.
19-inch SUV plus-size. Rim diameter 19 in; section 255 mm. Estimates on this page assume a typical load index for the SUV / crossover class.
Cars often seen on 255/45R19
These catalogue models are often seen on 255/45R19 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
How to set 255/45R19
- Measure before the school run, not after the motorway.
- Write LF / RF / RR / RL. Do not keep 255/45R19 numbers in your head.
- Add air in short bursts toward the placard, using 36 psi only as a map.
- If one 255/45R19 is 4 psi down, hunt for a nail before you blame the weather.
- Log date, ambient temperature and the four readings.
Temperature drift
Roughly 1 psi per 5–6 °C. The table uses 36 psi as a 20 °C baseline for 255/45R19.
| Ambient | Gauge | Bar | kPa | Note |
|---|---|---|---|---|
| −5 °C (hard frost) | 33 psi | 2.28 bar | 228 kPa | Gauge reads low; do not overfill once warm |
| 0 °C | 34 psi | 2.34 bar | 234 kPa | Gauge reads low; do not overfill once warm |
| 8 °C (UK winter morning) | 35 psi | 2.41 bar | 241 kPa | Gauge reads low; do not overfill once warm |
| 20 °C (set cold here) | 36 psi | 2.48 bar | 248 kPa | Baseline for this size sketch |
| 30 °C | 38 psi | 2.62 bar | 262 kPa | Do not bleed a hot 255/45R19 |
| 38 °C (heatwave tarmac) | 39 psi | 2.69 bar | 269 kPa | Do not bleed a hot 255/45R19 |
Keep 255/45R19 on the printed band for that car; 36 psi is a size sketch, not a second VIN label.
Questions about 255/45R19
What is 255/45R19 in bar?
36 psi is 2.48 bar. Add a tenth of a bar if the placard’s laden column is higher, which is common on vans that wear this size.
Can I run 255/45R19 at a lower pressure for comfort?
Not as a habit. A soft 255/45R19 cooks the shoulders and dulls steering. Keep load index and stay on the placard.
Should I bleed pressure after a motorway run?
No. Heat raises the gauge. Set cold only. Bleeding a hot tyre leaves it low the next morning.
Is the sidewall number correct for 255/45R19?
No. Sidewall PSI or kPa is a maximum for the carcass. Operating pressure is the door-pillar placard.
What PSI should 255/45R19 tyres be?
A SUV / crossover planning figure is about 36 psi cold (2.48 bar / 248 kPa). Confirm on the vehicle placard — two cars can share 255/45R19 and not share a sticker.
Handbook: placard · bar vs PSI · cold inflation · all sizes