245/35R20 · passenger car · Overview
Recommended pressure for 245/35R20 tyres
- Size
- 245/35R20
- Class
- passenger car
- Planning PSI
- 37
- Planning bar
- 2.55
245/35R20
37 psi / 2.55 bar
255 kPa · estimates for this size class
245/35R20 · 37 psi · 2.55 bar · 255 kPa — estimates. Placard wins.
Searches for “245/35R20 pressure” usually want a number. Use 37 psi (2.55 bar) only as a sketch; the door-pillar placard on the car that wears this size still wins. A 10 °C overnight drop takes roughly 1 psi (0.07 bar) off a closed 245/35R20. Low-profile {sz} does not want a “softer” pressure to recover ride. Stay at or slightly above the car’s original placard if load index is kept.
What 245/35R20 means
Read 245/35R20 as width / aspect R rim. Nothing in the size string is a pressure. Pressure lives on the car, not moulded as 205 or 55.
20-inch sport front. Rim diameter 20 in; section 245 mm. Estimates on this page assume a typical load index for the passenger car class.
Estimated 245/35R20 pressure by load
These 245/35R20 load steps are ± a few PSI from 37. They are not a licence to ignore a printed second column on a van or estate.
| Condition | Front (est.) | Rear (est.) |
|---|---|---|
| Driver only / unladen | 37 psi / 2.55 bar / 255 kPa | 37 psi / 2.55 bar / 255 kPa |
| Typical occupancy | 38 psi / 2.62 bar / 262 kPa | 39 psi / 2.69 bar / 269 kPa |
| Motorway + luggage (sketch) | 39 psi / 2.69 bar / 269 kPa | 40 psi / 2.76 bar / 276 kPa |
PSI, bar and kPa
Use the table, then set a cold gauge. 255 kPa is 100 × 2.55 bar on this size.
| PSI | Bar | kPa |
|---|---|---|
| 33 | 2.28 | 228 |
| 34 | 2.34 | 234 |
| 35 | 2.41 | 241 |
| 36 | 2.48 | 248 |
| 37 | 2.55 | 255 |
| 38 | 2.62 | 262 |
| 39 | 2.69 | 269 |
| 40 | 2.76 | 276 |
| 41 | 2.83 | 283 |
| 42 | 2.90 | 290 |
| 43 | 2.96 | 296 |
| 44 | 3.03 | 303 |
| 45 | 3.10 | 310 |
| 46 | 3.17 | 317 |
| 47 | 3.24 | 324 |
| 48 | 3.31 | 331 |
| 49 | 3.38 | 338 |
Placard versus sidewall
If a forum says “all 245/35R20 run 37 psi”, ignore it. A Qashqai and a Golf can share a size and not share a sticker.
Cars often seen on 245/35R20
These catalogue models are often seen on 245/35R20 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
How to set 245/35R20
- Park so the 245/35R20 tyres are cold (three hours, or less than about a mile).
- Read the door-pillar placard for that car — not the 245/35R20 sidewall maximum.
- If the sticker is missing, 37 psi / 2.55 bar is only a passenger car 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.
Temperature drift
Roughly 1 psi per 5–6 °C. The table uses 37 psi as a 20 °C baseline for 245/35R20.
| 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 245/35R20 |
| 38 °C (heatwave tarmac) | 40 psi | 2.76 bar | 276 kPa | Do not bleed a hot 245/35R20 |
If the door sticker and this 245/35R20 page disagree, the sticker wins.
Questions about 245/35R20
Can I run 245/35R20 at a lower pressure for comfort?
Not as a habit. A soft 245/35R20 cooks the shoulders and dulls steering. Keep load index and stay on the placard.
What PSI should 245/35R20 tyres be?
A passenger car planning figure is about 37 psi cold (2.55 bar / 255 kPa). Confirm on the vehicle placard — two cars can share 245/35R20 and not share a sticker.
Is the sidewall number correct for 245/35R20?
No. Sidewall PSI or kPa is a maximum for the carcass. Operating pressure is the door-pillar placard.
Is 245/35R20 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 245/35R20 in kPa?
255 kPa is the planning midpoint (100 kPa = 1 bar). 262 kPa is one PSI higher.
Handbook: placard · bar vs PSI · cold inflation · all sizes