225/60R18 · SUV / crossover · Bar
225/60R18 bar chart (2.34 bar planning figure)
- Size
- 225/60R18
- Class
- SUV / crossover
- Planning PSI
- 34
- Planning bar
- 2.34
bar
2.34
34 psi · 234 kPa · not a second factory sticker
225/60R18 · 34 psi · 2.34 bar · 234 kPa — estimates. Placard wins.
European stickers print bar. 225/60R18 often sits near 2.34 bar on a SUV / crossover (34 psi / 234 kPa). 2.34 bar is not “34 divided by ten”. Crossover / SUV highway size. These rows are estimates interpolated for the size, not OEM for a named VIN.
Bar, PSI and kPa
Use the table, then set a cold gauge. 234 kPa is 100 × 2.34 bar on this size.
| Bar | PSI | kPa |
|---|---|---|
| 2.07 | 30 | 207 |
| 2.14 | 31 | 214 |
| 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 |
Estimated 225/60R18 pressure by load
Plus-sizing to 225/60R18 from a taller OEM tyre usually keeps the same placard if the load index is equal or higher.
| 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 |
Placard versus sidewall
If a forum says “all 225/60R18 run 34 psi”, ignore it. A Qashqai and a Golf can share a size and not share a sticker.
What 225/60R18 means
225/60R18 means a 225 millimetre section width, a sidewall that is 60 percent of that width, on a 18-inch rim. The R is radial construction.
Crossover / SUV highway size. Rim diameter 18 in; section 225 mm. Estimates on this page assume a typical load index for the SUV / crossover class.
Cars often seen on 225/60R18
225/60R18 is a valid metric size in this register even if it is not on the curated OEM shortlist. Treat the 34 psi / 2.34 bar figure as a class estimate and confirm on the vehicle that actually wears it.
How to set 225/60R18
- Measure before the school run, not after the motorway.
- Write LF / RF / RR / RL. Do not keep 225/60R18 numbers in your head.
- Add air in short bursts toward the placard, using 34 psi only as a map.
- If one 225/60R18 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 225/60R18.
| 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 225/60R18 |
| 38 °C (heatwave tarmac) | 37 psi | 2.55 bar | 255 kPa | Do not bleed a hot 225/60R18 |
Keep 225/60R18 on the printed band for that car; 34 psi is a size sketch, not a second VIN label.
Questions about 225/60R18
Is the sidewall number correct for 225/60R18?
No. Sidewall PSI or kPa is a maximum for the carcass. Operating pressure is the door-pillar placard.
When does TPMS warn on 225/60R18?
Direct TPMS typically flags about 25% below target — near 26 psi if you were aiming at 34. Fill to the sticker, not to the lamp.
What is 225/60R18 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.
What PSI should 225/60R18 tyres be?
A SUV / crossover planning figure is about 34 psi cold (2.34 bar / 234 kPa). Confirm on the vehicle placard — two cars can share 225/60R18 and not share a sticker.
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