275/65R18 · pickup / double-cab · kPa
255 kPa for 275/65R18 tyres
- Size
- 275/65R18
- Class
- pickup / double-cab
- Planning PSI
- 37
- Planning bar
- 2.55
kPa
255
2.55 bar · 37 psi · 100 kPa = 1 bar
275/65R18 · 37 psi · 2.55 bar · 255 kPa — estimates. Placard wins.
If the gauge only speaks kPa, 255 kPa is the sketch for this pickup / double-cab size. Fine-tune to the vehicle that actually wears 275/65R18. A 10 °C overnight drop takes roughly 1 psi (0.07 bar) off a closed 275/65R18.
kPa, bar and PSI
Convert around the 275/65R18 band. 2.55 bar is about 37 psi — not 23, not 33 unless the maths says so.
| kPa | Bar | PSI |
|---|---|---|
| 228 | 2.28 | 33 |
| 234 | 2.34 | 34 |
| 241 | 2.41 | 35 |
| 248 | 2.48 | 36 |
| 255 | 2.55 | 37 |
| 262 | 2.62 | 38 |
| 269 | 2.69 | 39 |
| 276 | 2.76 | 40 |
| 283 | 2.83 | 41 |
| 290 | 2.90 | 42 |
| 296 | 2.96 | 43 |
| 303 | 3.03 | 44 |
| 310 | 3.10 | 45 |
| 317 | 3.17 | 46 |
| 324 | 3.24 | 47 |
| 331 | 3.31 | 48 |
| 338 | 3.38 | 49 |
Estimated 275/65R18 pressure by load
These 275/65R18 load steps are ± a few PSI from 37. They are not a licence to ignore a printed second column on a van or estate.
| Condition | Front (est.) | Rear (est.) |
|---|---|---|
| Driver only / unladen | 37 psi / 2.55 bar / 255 kPa | 39 psi / 2.69 bar / 269 kPa |
| Typical occupancy | 38 psi / 2.62 bar / 262 kPa | 41 psi / 2.83 bar / 283 kPa |
| Payload / towing (sketch) | 39 psi / 2.69 bar / 269 kPa | 42 psi / 2.9 bar / 290 kPa |
What 275/65R18 means
Read 275/65R18 as width / aspect R rim. Nothing in the size string is a pressure. Pressure lives on the car, not moulded as 205 or 55.
Plus-size 18-inch truck. Rim diameter 18 in; section 275 mm. Estimates on this page assume a typical load index for the pickup / double-cab class.
Placard versus sidewall
If a forum says “all 275/65R18 run 37 psi”, ignore it. A Qashqai and a Golf can share a size and not share a sticker.
Temperature drift
Roughly 1 psi per 5–6 °C. The table uses 37 psi as a 20 °C baseline for 275/65R18.
| Ambient | Gauge | Bar | kPa | Note |
|---|---|---|---|---|
| −5 °C (hard frost) | 34 psi | 2.34 bar | 234 kPa | Gauge reads low; do not overfill once warm |
| 0 °C | 35 psi | 2.41 bar | 241 kPa | Gauge reads low; do not overfill once warm |
| 8 °C (UK winter morning) | 36 psi | 2.48 bar | 248 kPa | Gauge reads low; do not overfill once warm |
| 20 °C (set cold here) | 37 psi | 2.55 bar | 255 kPa | Baseline for this size sketch |
| 30 °C | 39 psi | 2.69 bar | 269 kPa | Do not bleed a hot 275/65R18 |
| 38 °C (heatwave tarmac) | 40 psi | 2.76 bar | 276 kPa | Do not bleed a hot 275/65R18 |
How to set 275/65R18
- Measure before the school run, not after the motorway.
- Write LF / RF / RR / RL. Do not keep 275/65R18 numbers in your head.
- Add air in short bursts toward the placard, using 37 psi only as a map.
- If one 275/65R18 is 4 psi down, hunt for a nail before you blame the weather.
- Log date, ambient temperature and the four readings.
Cars often seen on 275/65R18
These catalogue models are often seen on 275/65R18 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
If the door sticker and this 275/65R18 page disagree, the sticker wins.
Questions about 275/65R18
Can I run 275/65R18 at a lower pressure for comfort?
Not as a habit. A soft 275/65R18 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.
What PSI should 275/65R18 tyres be?
A pickup / double-cab planning figure is about 37 psi cold (2.55 bar / 255 kPa). Confirm on the vehicle placard — two cars can share 275/65R18 and not share a sticker.
When does TPMS warn on 275/65R18?
Direct TPMS typically flags about 25% below target — near 28 psi if you were aiming at 37. Fill to the sticker, not to the lamp.
What is 275/65R18 in kPa?
255 kPa is the planning midpoint (100 kPa = 1 bar). 262 kPa is one PSI higher.
Handbook: placard · bar vs PSI · cold inflation · all sizes