225/45R17 · passenger car · Bar
225/45R17 bar chart (2.41 bar planning figure)
- Size
- 225/45R17
- Class
- passenger car
- Planning PSI
- 35
- Planning bar
- 2.41
bar
2.41
35 psi · 241 kPa · not a second factory sticker
225/45R17 · 35 psi · 2.41 bar · 241 kPa — estimates. Placard wins.
European stickers print bar. 225/45R17 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
Convert around the 225/45R17 band. 2.41 bar is about 35 psi — not 23, not 33 unless the maths says so.
| 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 225/45R17 pressure by load
These 225/45R17 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 | 35 psi / 2.41 bar / 241 kPa | 36 psi / 2.48 bar / 248 kPa |
| Motorway + luggage (sketch) | 36 psi / 2.48 bar / 248 kPa | 37 psi / 2.55 bar / 255 kPa |
Placard versus sidewall
This website maps size searches such as “225/45R17 psi”. It does not replace the VIN label. If the two disagree, the label wins.
What 225/45R17 means
225/45R17 means a 225 millimetre section width, a sidewall that is 45 percent of that width, on a 17-inch rim. The R is radial construction.
The default 17-inch sport / saloon size. Rim diameter 17 in; section 225 mm. Estimates on this page assume a typical load index for the passenger car class.
Cars often seen on 225/45R17
These catalogue models are often seen on 225/45R17 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
How to set 225/45R17
- Park so the 225/45R17 tyres are cold (three hours, or less than about a mile).
- Read the door-pillar placard for that car — not the 225/45R17 sidewall maximum.
- If the sticker is missing, 35 psi / 2.41 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 35 psi as a 20 °C baseline for 225/45R17.
| 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 225/45R17 |
| 38 °C (heatwave tarmac) | 38 psi | 2.62 bar | 262 kPa | Do not bleed a hot 225/45R17 |
If the door sticker and this 225/45R17 page disagree, the sticker wins.
Questions about 225/45R17
Is 225/45R17 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.
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.
When does TPMS warn on 225/45R17?
Direct TPMS typically flags about 25% below target — near 26 psi if you were aiming at 35. Fill to the sticker, not to the lamp.
What is 225/45R17 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.
Is the sidewall number correct for 225/45R17?
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