205/40R17 · passenger car · Bar
205/40R17 bar chart (2.41 bar planning figure)
- Size
- 205/40R17
- Class
- passenger car
- Planning PSI
- 35
- Planning bar
- 2.41
bar
2.41
35 psi · 241 kPa · not a second factory sticker
205/40R17 · 35 psi · 2.41 bar · 241 kPa — estimates. Placard wins.
European stickers print bar. 205/40R17 often sits near 2.41 bar on a passenger car (35 psi / 241 kPa). 2.41 bar is not “35 divided by ten”. TPMS typically warns near 26 psi (about 25% below a 35 psi target). That is already a soft tyre. 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.
Bar, PSI and kPa
Use the table, then set a cold gauge. 241 kPa is 100 × 2.41 bar on this size.
| Bar | PSI | kPa |
|---|---|---|
| 2.14 | 31 | 214 |
| 2.21 | 32 | 221 |
| 2.28 | 33 | 228 |
| 2.34 | 34 | 234 |
| 2.41 | 35 | 241 |
| 2.48 | 36 | 248 |
| 2.55 | 37 | 255 |
| 2.62 | 38 | 262 |
| 2.69 | 39 | 269 |
| 2.76 | 40 | 276 |
| 2.83 | 41 | 283 |
| 2.90 | 42 | 290 |
| 2.96 | 43 | 296 |
| 3.03 | 44 | 303 |
| 3.10 | 45 | 310 |
| 3.17 | 46 | 317 |
| 3.24 | 47 | 324 |
Estimated 205/40R17 pressure by load
These 205/40R17 load steps are ± a few PSI from 35. They are not a licence to ignore a printed second column on a van or estate.
| Condition | Front (est.) | Rear (est.) |
|---|---|---|
| Driver only / unladen | 35 psi / 2.41 bar / 241 kPa | 35 psi / 2.41 bar / 241 kPa |
| Typical occupancy | 36 psi / 2.48 bar / 248 kPa | 37 psi / 2.55 bar / 255 kPa |
| Motorway + luggage (sketch) | 37 psi / 2.55 bar / 255 kPa | 38 psi / 2.62 bar / 262 kPa |
Placard versus sidewall
The sidewall of a 205/40R17 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.
What 205/40R17 means
Read 205/40R17 as width / aspect R rim. Nothing in the size string is a pressure. Pressure lives on the car, not moulded as 205 or 55.
Very low 17-inch compact. Rim diameter 17 in; section 205 mm. Estimates on this page assume a typical load index for the passenger car class.
Cars often seen on 205/40R17
These catalogue models are often seen on 205/40R17 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
How to set 205/40R17
- Measure before the school run, not after the motorway.
- Write LF / RF / RR / RL. Do not keep 205/40R17 numbers in your head.
- Add air in short bursts toward the placard, using 35 psi only as a map.
- If one 205/40R17 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 35 psi as a 20 °C baseline for 205/40R17.
| Ambient | Gauge | Bar | kPa | Note |
|---|---|---|---|---|
| −5 °C (hard frost) | 32 psi | 2.21 bar | 221 kPa | Gauge reads low; do not overfill once warm |
| 0 °C | 33 psi | 2.28 bar | 228 kPa | Gauge reads low; do not overfill once warm |
| 8 °C (UK winter morning) | 34 psi | 2.34 bar | 234 kPa | Gauge reads low; do not overfill once warm |
| 20 °C (set cold here) | 35 psi | 2.41 bar | 241 kPa | Baseline for this size sketch |
| 30 °C | 37 psi | 2.55 bar | 255 kPa | Do not bleed a hot 205/40R17 |
| 38 °C (heatwave tarmac) | 38 psi | 2.62 bar | 262 kPa | Do not bleed a hot 205/40R17 |
A cheap gauge and a monthly habit will do more for a set of 205/40R17 than nitrogen upsells.
Questions about 205/40R17
Should I bleed pressure after a motorway run?
No. Heat raises the gauge. Set cold only. Bleeding a hot tyre leaves it low the next morning.
What PSI should 205/40R17 tyres be?
A passenger car planning figure is about 35 psi cold (2.41 bar / 241 kPa). Confirm on the vehicle placard — two cars can share 205/40R17 and not share a sticker.
Is 205/40R17 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 205/40R17 in kPa?
241 kPa is the planning midpoint (100 kPa = 1 bar). 248 kPa is one PSI higher.
What is 205/40R17 in bar?
35 psi is 2.41 bar. Add a tenth of a bar if the placard’s laden column is higher, which is common on vans that wear this size.
Handbook: placard · bar vs PSI · cold inflation · all sizes