Toyota · Proace · Cold
Toyota Proace cold-inflation guide
- Drivetrain
- front-wheel drive
- Body
- light commercial
- PSI F / R
- 35-45 / 45-65
- Bar F / R
- 2.4-3.1 / 3.1-4.5
psi
40 / 55
Catalogue mid-points, front / rear · 2.4-3.1 / 3.1-4.5 bar
35-45 psi F · 45-65 psi R · 2.4-3.1 / 3.1-4.5 bar · 276/379 kPa
UK winter mornings will show a lower gauge on this Proace without a puncture. Set 40/55 psi at ~20 °C equivalent, not after a motorway blast. Under-inflation cooks the shoulders of a Proace; over-inflation wears the centre rib and bangs every cat’s eye.
Temperature and a cold gauge
Roughly 1 psi per 5–6 °C. The table uses 40 psi as a 20 °C baseline for this Proace.
| Ambient | Gauge (front mid) | Bar | kPa | Note |
|---|---|---|---|---|
| −5 °C (hard frost) | 37 psi | 2.55 bar | 255 kPa | Gauge reads low; do not overfill once warm |
| 0 °C | 38 psi | 2.62 bar | 262 kPa | Gauge reads low; do not overfill once warm |
| 8 °C (UK winter morning) | 39 psi | 2.69 bar | 269 kPa | Gauge reads low; do not overfill once warm |
| 20 °C (set cold here) | 40 psi | 2.76 bar | 276 kPa | Baseline |
| 30 °C | 42 psi | 2.9 bar | 290 kPa | Do not bleed a hot tyre |
| 38 °C (heatwave tarmac) | 43 psi | 2.96 bar | 296 kPa | Do not bleed a hot tyre |
How to set the Proace
- Measure before the school run, not after the M25.
- Write LF / RF / RR / RL. Do not keep Proace numbers in your head.
- Add air in short bursts toward 40 psi (2.76 bar) front and 55 psi rear.
- If one corner is 4 psi down, hunt for a nail before you blame the weather.
- Log date, ambient temperature and the four readings.
Toyota Proace placard versus sidewall
Sidewall PSI is a carcass maximum. Recommended operating pressure for this Proace is the pillar sticker, near 40/55 psi.
Estimated pressure by tyre size (255/65R17 and others)
Planning cold pressures for sizes often seen on a light commercial. This Proace sample opens with 255/65R17, then 265/70R17 and 275/65R18.
| Tyre size | Front PSI | Rear PSI | Front bar | Rear bar | Front kPa | Rear kPa | Note |
|---|---|---|---|---|---|---|---|
| 255/65R17 | 43 | 60 | 2.96 | 4.14 | 296 | 414 | Highway 17-inch |
| 265/70R17 | 43 | 60 | 2.96 | 4.14 | 296 | 414 | Typical 17-inch load tyre |
| 275/65R18 | 43 | 61 | 2.96 | 4.21 | 296 | 421 | Plus-size 18-inch |
| LT245/75R16 | 48 | 67 | 3.31 | 4.62 | 331 | 462 | LT-metric, higher load |
| 245/70R16 | 42 | 59 | 2.9 | 4.07 | 290 | 407 | Common 16-inch all-terrain |
| 285/70R17 | 44 | 62 | 3.03 | 4.27 | 303 | 427 | Wide all-terrain |
| LT265/70R17 | 48 | 69 | 3.31 | 4.76 | 331 | 476 | LT 17-inch |
| 235/75R15 | 41 | 58 | 2.83 | 4 | 283 | 400 | Older compact truck |
PSI, bar and kPa
PSI-led conversions for the Toyota Proace band (35-45 / 45-65).
| PSI | Bar | kPa |
|---|---|---|
| 35 | 2.41 | 241 |
| 36 | 2.48 | 248 |
| 38 | 2.62 | 262 |
| 40 | 2.76 | 276 |
| 44 | 3.03 | 303 |
| 45 | 3.10 | 310 |
| 50 | 3.45 | 345 |
| 55 | 3.79 | 379 |
| 60 | 4.14 | 414 |
| 65 | 4.48 | 448 |
Load notes
Load moves the rear of a light commercial first. If the factory placard already has a “laden” column, use that instead of these sketches.
| Condition | Front (est.) | Rear (est.) |
|---|---|---|
| Driver only | 40 psi / 2.76 bar | 55 psi / 3.79 bar |
| Full occupancy | 40 psi / 2.76 bar | 56 psi / 3.86 bar |
| Motorway + luggage | 41 psi / 2.83 bar | 58 psi / 4 bar |
Toyota notes
Toyota trucks print front and rear separately more often than cars. A roof box on a RAV4 is a load condition, not a forum “add 5 psi” rule.
Spare and inflator kit
A matching full-size spare on the Toyota Proace usually follows the higher axle (often the rear, near 45-65 psi). A space-saver is commonly 60 psi / 4.1 bar — read that tyre’s own sidewall. An inflator kit is not a spare; check the sealant date.
A cheap gauge and a monthly habit will do more for this Proace than nitrogen upsells.
Other Toyota models
Questions about this Proace
Is the sidewall number correct on a Toyota Proace?
No. Sidewall PSI is a maximum. The Proace placard is the operating target, near 35-45/45-65 psi.
How often should I check a Proace?
Monthly, before a long trip, and after a 10 °C weather swing. Include a full-size spare.
What PSI if I plus-size toward 275/65R18?
Keep load index at or above OEM. Low-profile sizes usually stay at or slightly above the placard. Use 255/65R17, 265/70R17 and 275/65R18 as a planning band.
Front versus rear on the Toyota Proace?
This row is 35-45 F / 45-65 R. Even when they match, a laden rear can justify a higher number if the sticker prints one.
When does TPMS warn on a Toyota Proace?
Direct TPMS typically flags about 25% below placard — near 30 psi on this row. Fill to the sticker, not to the lamp.
Handbook: placard · bar vs PSI · front vs rear · cold inflation