275/70R18 · pickup / double-cab · Bar
275/70R18 bar chart (2.55 bar planning figure)
- Size
- 275/70R18
- Class
- pickup / double-cab
- Planning PSI
- 37
- Planning bar
- 2.55
bar
2.55
37 psi · 255 kPa · not a second factory sticker
275/70R18 · 37 psi · 2.55 bar · 255 kPa — estimates. Placard wins.
A 275/70R18 C-type or LT carcass can live far above a hatchback bar figure. This page’s 2.55 bar sketch is for the pickup / double-cab class, not every car that can physically mount the tyre. A 10 °C overnight drop takes roughly 1 psi (0.07 bar) off a closed 275/70R18.
Bar, PSI and kPa
Use the table, then set a cold gauge. 255 kPa is 100 × 2.55 bar on this size.
| Bar | PSI | kPa |
|---|---|---|
| 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 |
| 3.38 | 49 | 338 |
Estimated 275/70R18 pressure by load
These 275/70R18 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 |
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.
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.
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 |
Keep 275/70R18 on the printed band for that car; 37 psi is a size sketch, not a second VIN label.
Questions about 275/70R18
Can I run 275/70R18 at a lower pressure for comfort?
Not as a habit. A soft 275/70R18 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.
When does TPMS warn on 275/70R18?
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 275/70R18 in kPa?
255 kPa is the planning midpoint (100 kPa = 1 bar). 262 kPa is one PSI higher.
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.
Handbook: placard · bar vs PSI · cold inflation · all sizes