275/70R18 · pickup / double-cab · PSI
What PSI for 275/70R18 tyres?
- Size
- 275/70R18
- Class
- pickup / double-cab
- Planning PSI
- 37
- Planning bar
- 2.55
psi
37
2.55 bar · 255 kPa · pickup / double-cab planning figure
275/70R18 · 37 psi · 2.55 bar · 255 kPa — estimates. Placard wins.
If someone typed “275/70R18 psi”, they want Imperial. Start near 37 psi on an unladen pickup / double-cab, then confirm the vehicle placard. Sidewall max is not the target. Under-inflation cooks the shoulders of a 275/70R18; over-inflation wears the centre rib and bangs every cat’s eye.
Estimated 275/70R18 pressure by load
Load moves the rear first on a pickup / double-cab. If the factory placard already has a laden column, use that — not this sketch for 275/70R18.
| Condition | Front (est.) | Rear (est.) |
|---|---|---|
| Driver only / unladen | 37 psi / 2.55 bar / 255 kPa | 41 psi / 2.83 bar / 283 kPa |
| Typical occupancy | 37 psi / 2.55 bar / 255 kPa | 42 psi / 2.9 bar / 290 kPa |
| Payload / towing (sketch) | 38 psi / 2.62 bar / 262 kPa | 43 psi / 2.96 bar / 296 kPa |
PSI, bar and kPa
Use the table, then set a cold gauge. 255 kPa is 100 × 2.55 bar on this size.
| PSI | Bar | kPa |
|---|---|---|
| 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 |
| 47 | 3.24 | 324 |
| 48 | 3.31 | 331 |
| 49 | 3.38 | 338 |
What 275/70R18 means
Read 275/70R18 as width / aspect R rim. Nothing in the size string is a pressure. Pressure lives on the car, not moulded as 205 or 55.
Heavier rear-bias 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
This website maps size searches such as “275/70R18 psi”. It does not replace the VIN label. If the two disagree, the label wins.
Cars often seen on 275/70R18
These catalogue models are often seen on 275/70R18 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
How to set 275/70R18
- Measure before the school run, not after the motorway.
- Write LF / RF / RR / RL. Do not keep 275/70R18 numbers in your head.
- Add air in short bursts toward the placard, using 37 psi only as a map.
- If one 275/70R18 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 37 psi as a 20 °C baseline for 275/70R18.
| 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 275/70R18 |
| 38 °C (heatwave tarmac) | 40 psi | 2.76 bar | 276 kPa | Do not bleed a hot 275/70R18 |
If the door sticker and this 275/70R18 page disagree, the sticker wins.
Questions about 275/70R18
What is 275/70R18 in bar?
37 psi is 2.55 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 275/70R18 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 275/70R18 and not share a sticker.
Is 275/70R18 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.
Is the sidewall number correct for 275/70R18?
No. Sidewall PSI or kPa is a maximum for the carcass. Operating pressure is the door-pillar placard.
What is 275/70R18 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