LT285/70R17 · LT-metric truck · kPa
LT285/70R17 tyre pressure in kPa
- Size
- LT285/70R17
- Class
- LT-metric truck
- Planning PSI
- 56
- Planning bar
- 3.86
kPa
386
3.86 bar · 56 psi · 100 kPa = 1 bar
LT285/70R17 · 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 LT285/70R17 (3.86 bar / 56 psi). 100 kPa = 1 bar. Wide all-terrain LT. 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
Use the table, then set a cold gauge. 386 kPa is 100 × 3.86 bar on this size.
| 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 LT285/70R17 pressure by load
These LT285/70R17 load steps are ± a few PSI from 56. They are not a licence to ignore a printed second column on a van or estate.
| Condition | Front (est.) | Rear (est.) |
|---|---|---|
| Driver only / unladen | 56 psi / 3.86 bar / 386 kPa | 58 psi / 4 bar / 400 kPa |
| Typical occupancy | 56 psi / 3.86 bar / 386 kPa | 59 psi / 4.07 bar / 407 kPa |
| Payload / towing (sketch) | 57 psi / 3.93 bar / 393 kPa | 66 psi / 4.55 bar / 455 kPa |
What LT285/70R17 means
Read LT285/70R17 as width / aspect R rim. Nothing in the size string is a pressure. Pressure lives on the car, not moulded as 205 or 55.
Wide all-terrain LT. Rim diameter 17 in; section 285 mm. Estimates on this page assume a typical load index for the LT-metric truck class.
Placard versus sidewall
This website maps size searches such as “LT285/70R17 psi”. It does not replace the VIN label. If the two disagree, the label wins.
Temperature drift
Roughly 1 psi per 5–6 °C. The table uses 56 psi as a 20 °C baseline for LT285/70R17.
| 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 LT285/70R17 |
| 38 °C (heatwave tarmac) | 59 psi | 4.07 bar | 407 kPa | Do not bleed a hot LT285/70R17 |
How to set LT285/70R17
- Measure before the school run, not after the motorway.
- Write LF / RF / RR / RL. Do not keep LT285/70R17 numbers in your head.
- Add air in short bursts toward the placard, using 56 psi only as a map.
- If one LT285/70R17 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 LT285/70R17
These catalogue models are often seen on LT285/70R17 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
If the door sticker and this LT285/70R17 page disagree, the sticker wins.
Questions about LT285/70R17
What PSI should LT285/70R17 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 LT285/70R17 and not share a sticker.
Can I run LT285/70R17 at a lower pressure for comfort?
Not as a habit. A soft LT285/70R17 cooks the shoulders and dulls steering. Keep load index and stay on the placard.
What is LT285/70R17 in bar?
56 psi is 3.86 bar. Add a tenth of a bar if the placard’s laden column is higher, which is common on vans that wear this size.
When does TPMS warn on LT285/70R17?
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.
Is the sidewall number correct for LT285/70R17?
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