275/65R18 · pickup / double-cab · Bar
Recommended bar for 275/65R18
- Size
- 275/65R18
- Class
- pickup / double-cab
- Planning PSI
- 37
- Planning bar
- 2.55
bar
2.55
37 psi · 255 kPa · not a second factory sticker
275/65R18 · 37 psi · 2.55 bar · 255 kPa — estimates. Placard wins.
European stickers print bar. 275/65R18 often sits near 2.55 bar on a pickup / double-cab (37 psi / 255 kPa). 2.55 bar is not “37 divided by ten”. Plus-size 18-inch truck. These rows are estimates interpolated for the size, not OEM for a named VIN.
Bar, PSI and kPa
1 bar ≈ 14.5 psi; 1 psi ≈ 6.89 kPa. Planning midpoint for 275/65R18: 37 psi = 2.55 bar = 255 kPa.
| 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 275/65R18 pressure by load
Plus-sizing to 275/65R18 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 | 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 |
Placard versus sidewall
This website maps size searches such as “275/65R18 psi”. It does not replace the VIN label. If the two disagree, the label wins.
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.
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.
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.
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 |
Keep 275/65R18 on the printed band for that car; 37 psi is a size sketch, not a second VIN label.
Questions about 275/65R18
What is 275/65R18 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.
Is 275/65R18 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.
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.
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.
Handbook: placard · bar vs PSI · cold inflation · all sizes