LT285/70R17 · LT-metric truck · Bar
LT285/70R17 tyre pressure in bar
- Size
- LT285/70R17
- Class
- LT-metric truck
- Planning PSI
- 56
- Planning bar
- 3.86
bar
3.86
56 psi · 386 kPa · not a second factory sticker
LT285/70R17 · 56 psi · 3.86 bar · 386 kPa — estimates. Placard wins.
A LT285/70R17 C-type or LT carcass can live far above a hatchback bar figure. This page’s 3.86 bar sketch is for the LT-metric truck 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 LT285/70R17. LT-metric sizes print a load range. The vehicle door sticker, not the LT sidewall maximum, is still the operating pressure.
Bar, PSI and kPa
Use the table, then set a cold gauge. 386 kPa is 100 × 3.86 bar on this size.
| Bar | PSI | kPa |
|---|---|---|
| 3.03 | 44 | 303 |
| 3.17 | 46 | 317 |
| 3.45 | 50 | 345 |
| 3.59 | 52 | 359 |
| 3.65 | 53 | 365 |
| 3.72 | 54 | 372 |
| 3.79 | 55 | 379 |
| 3.86 | 56 | 386 |
| 3.93 | 57 | 393 |
| 4.00 | 58 | 400 |
| 4.07 | 59 | 407 |
| 4.14 | 60 | 414 |
| 4.21 | 61 | 421 |
| 4.27 | 62 | 427 |
| 4.34 | 63 | 434 |
| 4.41 | 64 | 441 |
| 4.48 | 65 | 448 |
| 4.55 | 66 | 455 |
| 4.62 | 67 | 462 |
| 4.69 | 68 | 469 |
| 5.52 | 80 | 552 |
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 | 57 psi / 3.93 bar / 393 kPa | 60 psi / 4.14 bar / 414 kPa |
| Payload / towing (sketch) | 58 psi / 4 bar / 400 kPa | 67 psi / 4.62 bar / 462 kPa |
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.
What LT285/70R17 means
LT285/70R17 means a 285 millimetre section width, a sidewall that is 70 percent of that width, on a 17-inch rim. The R is radial construction.
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.
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.
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.
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 |
A cheap gauge and a monthly habit will do more for a set of LT285/70R17 than nitrogen upsells.
Questions about LT285/70R17
Is LT285/70R17 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.
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.
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.
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