LT275/70R18 · LT-metric truck · kPa
LT275/70R18 kPa inflation table
- Size
- LT275/70R18
- Class
- LT-metric truck
- Planning PSI
- 56
- Planning bar
- 3.86
kPa
386
3.86 bar · 56 psi · 100 kPa = 1 bar
LT275/70R18 · 56 psi · 3.86 bar · 386 kPa — estimates. Placard wins.
Kilopascals show up on some Asian stickers and ISO sheets. 386 kPa is the planning midpoint for LT275/70R18 (3.86 bar / 56 psi). 100 kPa = 1 bar. Plus-size LT 18-inch. These rows are estimates interpolated for the size, not OEM for a named VIN. LT-metric sizes print a load range. The vehicle door sticker, not the LT sidewall maximum, is still the operating pressure.
kPa, bar and PSI
1 bar ≈ 14.5 psi; 1 psi ≈ 6.89 kPa. Planning midpoint for LT275/70R18: 56 psi = 3.86 bar = 386 kPa.
| kPa | Bar | PSI |
|---|---|---|
| 303 | 3.03 | 44 |
| 317 | 3.17 | 46 |
| 345 | 3.45 | 50 |
| 359 | 3.59 | 52 |
| 365 | 3.65 | 53 |
| 372 | 3.72 | 54 |
| 379 | 3.79 | 55 |
| 386 | 3.86 | 56 |
| 393 | 3.93 | 57 |
| 400 | 4.00 | 58 |
| 407 | 4.07 | 59 |
| 414 | 4.14 | 60 |
| 421 | 4.21 | 61 |
| 427 | 4.27 | 62 |
| 434 | 4.34 | 63 |
| 441 | 4.41 | 64 |
| 448 | 4.48 | 65 |
| 455 | 4.55 | 66 |
| 462 | 4.62 | 67 |
| 469 | 4.69 | 68 |
| 552 | 5.52 | 80 |
Estimated LT275/70R18 pressure by load
Plus-sizing to LT275/70R18 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 | 56 psi / 3.86 bar / 386 kPa | 59 psi / 4.07 bar / 407 kPa |
| Typical occupancy | 57 psi / 3.93 bar / 393 kPa | 61 psi / 4.21 bar / 421 kPa |
| Payload / towing (sketch) | 58 psi / 4 bar / 400 kPa | 68 psi / 4.69 bar / 469 kPa |
What LT275/70R18 means
Read LT275/70R18 as width / aspect R rim. Nothing in the size string is a pressure. Pressure lives on the car, not moulded as 205 or 55.
Plus-size LT 18-inch. Rim diameter 18 in; section 275 mm. Estimates on this page assume a typical load index for the LT-metric truck class.
Placard versus sidewall
If a forum says “all LT275/70R18 run 56 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 56 psi as a 20 °C baseline for LT275/70R18.
| Ambient | Gauge | Bar | kPa | Note |
|---|---|---|---|---|
| −5 °C (hard frost) | 53 psi | 3.65 bar | 365 kPa | Gauge reads low; do not overfill once warm |
| 0 °C | 54 psi | 3.72 bar | 372 kPa | Gauge reads low; do not overfill once warm |
| 8 °C (UK winter morning) | 55 psi | 3.79 bar | 379 kPa | Gauge reads low; do not overfill once warm |
| 20 °C (set cold here) | 56 psi | 3.86 bar | 386 kPa | Baseline for this size sketch |
| 30 °C | 58 psi | 4 bar | 400 kPa | Do not bleed a hot LT275/70R18 |
| 38 °C (heatwave tarmac) | 59 psi | 4.07 bar | 407 kPa | Do not bleed a hot LT275/70R18 |
How to set LT275/70R18
- Park so the LT275/70R18 tyres are cold (three hours, or less than about a mile).
- Read the door-pillar placard for that car — not the LT275/70R18 sidewall maximum.
- If the sticker is missing, 56 psi / 3.86 bar is only a LT-metric truck planning figure for this size.
- Set all four with a calibrated gauge. A 3 psi miss on one corner shows up as a wander.
- Refit valve caps and reset TPMS if the handbook asks for a relearn.
Cars often seen on LT275/70R18
These catalogue models are often seen on LT275/70R18 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
Keep LT275/70R18 on the printed band for that car; 56 psi is a size sketch, not a second VIN label.
Questions about LT275/70R18
Can I run LT275/70R18 at a lower pressure for comfort?
Not as a habit. A soft LT275/70R18 cooks the shoulders and dulls steering. Keep load index and stay on the placard.
When does TPMS warn on LT275/70R18?
Direct TPMS typically flags about 25% below target — near 42 psi if you were aiming at 56. Fill to the sticker, not to the lamp.
What is LT275/70R18 in kPa?
386 kPa is the planning midpoint (100 kPa = 1 bar). 393 kPa is one PSI higher.
What PSI should LT275/70R18 tyres be?
A LT-metric truck planning figure is about 56 psi cold (3.86 bar / 386 kPa). Confirm on the vehicle placard — two cars can share LT275/70R18 and not share a sticker.
Is the sidewall number correct for LT275/70R18?
No. Sidewall PSI or kPa is a maximum for the carcass. Operating pressure is the door-pillar placard.
Handbook: placard · bar vs PSI · cold inflation · all sizes