225/55R16 · passenger car · PSI
225/55R16 PSI chart (34 psi planning figure)
- Size
- 225/55R16
- Class
- passenger car
- Planning PSI
- 34
- Planning bar
- 2.34
psi
34
2.34 bar · 234 kPa · passenger car planning figure
225/55R16 · 34 psi · 2.34 bar · 234 kPa — estimates. Placard wins.
If someone typed “225/55R16 psi”, they want Imperial. Start near 34 psi on an unladen passenger car, then confirm the vehicle placard. Sidewall max is not the target. A 10 °C overnight drop takes roughly 1 psi (0.07 bar) off a closed 225/55R16.
Estimated 225/55R16 pressure by load
These 225/55R16 load steps are ± a few PSI from 34. They are not a licence to ignore a printed second column on a van or estate.
| Condition | Front (est.) | Rear (est.) |
|---|---|---|
| Driver only / unladen | 34 psi / 2.34 bar / 234 kPa | 34 psi / 2.34 bar / 234 kPa |
| Typical occupancy | 35 psi / 2.41 bar / 241 kPa | 36 psi / 2.48 bar / 248 kPa |
| Motorway + luggage (sketch) | 36 psi / 2.48 bar / 248 kPa | 37 psi / 2.55 bar / 255 kPa |
PSI, bar and kPa
Convert around the 225/55R16 band. 2.34 bar is about 34 psi — not 23, not 33 unless the maths says so.
| PSI | Bar | kPa |
|---|---|---|
| 30 | 2.07 | 207 |
| 31 | 2.14 | 214 |
| 32 | 2.21 | 221 |
| 33 | 2.28 | 228 |
| 34 | 2.34 | 234 |
| 35 | 2.41 | 241 |
| 36 | 2.48 | 248 |
| 37 | 2.55 | 255 |
| 38 | 2.62 | 262 |
| 39 | 2.69 | 269 |
| 40 | 2.76 | 276 |
| 41 | 2.83 | 283 |
| 42 | 2.90 | 290 |
| 43 | 2.96 | 296 |
| 44 | 3.03 | 303 |
| 45 | 3.10 | 310 |
| 46 | 3.17 | 317 |
What 225/55R16 means
225/55R16 means a 225 millimetre section width, a sidewall that is 55 percent of that width, on a 16-inch rim. The R is radial construction.
Wide 16-inch touring. Rim diameter 16 in; section 225 mm. Estimates on this page assume a typical load index for the passenger car class.
Placard versus sidewall
This website maps size searches such as “225/55R16 psi”. It does not replace the VIN label. If the two disagree, the label wins.
Cars often seen on 225/55R16
These catalogue models are often seen on 225/55R16 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
How to set 225/55R16
- Measure before the school run, not after the motorway.
- Write LF / RF / RR / RL. Do not keep 225/55R16 numbers in your head.
- Add air in short bursts toward the placard, using 34 psi only as a map.
- If one 225/55R16 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 34 psi as a 20 °C baseline for 225/55R16.
| Ambient | Gauge | Bar | kPa | Note |
|---|---|---|---|---|
| −5 °C (hard frost) | 31 psi | 2.14 bar | 214 kPa | Gauge reads low; do not overfill once warm |
| 0 °C | 32 psi | 2.21 bar | 221 kPa | Gauge reads low; do not overfill once warm |
| 8 °C (UK winter morning) | 33 psi | 2.28 bar | 228 kPa | Gauge reads low; do not overfill once warm |
| 20 °C (set cold here) | 34 psi | 2.34 bar | 234 kPa | Baseline for this size sketch |
| 30 °C | 36 psi | 2.48 bar | 248 kPa | Do not bleed a hot 225/55R16 |
| 38 °C (heatwave tarmac) | 37 psi | 2.55 bar | 255 kPa | Do not bleed a hot 225/55R16 |
If the door sticker and this 225/55R16 page disagree, the sticker wins.
Questions about 225/55R16
Is the sidewall number correct for 225/55R16?
No. Sidewall PSI or kPa is a maximum for the carcass. Operating pressure is the door-pillar placard.
What PSI should 225/55R16 tyres be?
A passenger car planning figure is about 34 psi cold (2.34 bar / 234 kPa). Confirm on the vehicle placard — two cars can share 225/55R16 and not share a sticker.
Is 225/55R16 the same as a plus-size swap?
Only if that is the size you fitted. Overall diameter should stay close to OEM. Pressure still follows the car, with load index at or above original.
What is 225/55R16 in bar?
34 psi is 2.34 bar. Add a tenth of a bar if the placard’s laden column is higher, which is common on vans that wear this size.
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.
Handbook: placard · bar vs PSI · cold inflation · all sizes