215/50R17 · passenger car · PSI
What PSI for 215/50R17 tyres?
- Size
- 215/50R17
- Class
- passenger car
- Planning PSI
- 34
- Planning bar
- 2.34
psi
34
2.34 bar · 234 kPa · passenger car planning figure
215/50R17 · 34 psi · 2.34 bar · 234 kPa — estimates. Placard wins.
If someone typed “215/50R17 psi”, they want Imperial. Start near 34 psi on an unladen passenger car, then confirm the vehicle placard. Sidewall max is not the target. A 10 °C overnight drop takes roughly 1 psi (0.07 bar) off a closed 215/50R17.
Estimated 215/50R17 pressure by load
Plus-sizing to 215/50R17 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 | 34 psi / 2.34 bar / 234 kPa | 34 psi / 2.34 bar / 234 kPa |
| Typical occupancy | 34 psi / 2.34 bar / 234 kPa | 35 psi / 2.41 bar / 241 kPa |
| Motorway + luggage (sketch) | 35 psi / 2.41 bar / 241 kPa | 36 psi / 2.48 bar / 248 kPa |
PSI, bar and kPa
1 bar ≈ 14.5 psi; 1 psi ≈ 6.89 kPa. Planning midpoint for 215/50R17: 34 psi = 2.34 bar = 234 kPa.
| PSI | Bar | kPa |
|---|---|---|
| 30 | 2.07 | 207 |
| 31 | 2.14 | 214 |
| 32 | 2.21 | 221 |
| 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 |
What 215/50R17 means
Read 215/50R17 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 17-inch touring. Rim diameter 17 in; section 215 mm. Estimates on this page assume a typical load index for the passenger car class.
Placard versus sidewall
The sidewall of a 215/50R17 may say 51 psi or 350 kPa. That is a carcass maximum. Operating pressure is the tyre-information placard on the driver’s door pillar.
Cars often seen on 215/50R17
These catalogue models are often seen on 215/50R17 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
How to set 215/50R17
- Measure before the school run, not after the motorway.
- Write LF / RF / RR / RL. Do not keep 215/50R17 numbers in your head.
- Add air in short bursts toward the placard, using 34 psi only as a map.
- If one 215/50R17 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 34 psi as a 20 °C baseline for 215/50R17.
| Ambient | Gauge | Bar | kPa | Note |
|---|---|---|---|---|
| −5 °C (hard frost) | 31 psi | 2.14 bar | 214 kPa | Gauge reads low; do not overfill once warm |
| 0 °C | 32 psi | 2.21 bar | 221 kPa | Gauge reads low; do not overfill once warm |
| 8 °C (UK winter morning) | 33 psi | 2.28 bar | 228 kPa | Gauge reads low; do not overfill once warm |
| 20 °C (set cold here) | 34 psi | 2.34 bar | 234 kPa | Baseline for this size sketch |
| 30 °C | 36 psi | 2.48 bar | 248 kPa | Do not bleed a hot 215/50R17 |
| 38 °C (heatwave tarmac) | 37 psi | 2.55 bar | 255 kPa | Do not bleed a hot 215/50R17 |
A cheap gauge and a monthly habit will do more for a set of 215/50R17 than nitrogen upsells.
Questions about 215/50R17
What PSI should 215/50R17 tyres be?
A passenger car planning figure is about 34 psi cold (2.34 bar / 234 kPa). Confirm on the vehicle placard — two cars can share 215/50R17 and not share a sticker.
Can I run 215/50R17 at a lower pressure for comfort?
Not as a habit. A soft 215/50R17 cooks the shoulders and dulls steering. Keep load index and stay on the placard.
Is the sidewall number correct for 215/50R17?
No. Sidewall PSI or kPa is a maximum for the carcass. Operating pressure is the door-pillar placard.
When does TPMS warn on 215/50R17?
Direct TPMS typically flags about 25% below target — near 26 psi if you were aiming at 34. Fill to the sticker, not to the lamp.
What is 215/50R17 in kPa?
234 kPa is the planning midpoint (100 kPa = 1 bar). 241 kPa is one PSI higher.
Handbook: placard · bar vs PSI · cold inflation · all sizes