UK · EU reference Tyre Pressure

225/55R17 · SUV / crossover · kPa

234 kPa for 225/55R17 tyres

Size
225/55R17
Class
SUV / crossover
Planning PSI
34
Planning bar
2.34

kPa

234

2.34 bar · 34 psi · 100 kPa = 1 bar

225/55R17 · 34 psi · 2.34 bar · 234 kPa — estimates. Placard wins.

If the gauge only speaks kPa, 234 kPa is the sketch for this SUV / crossover size. Fine-tune to the vehicle that actually wears 225/55R17. A 10 °C overnight drop takes roughly 1 psi (0.07 bar) off a closed 225/55R17.

kPa, bar and PSI

1 bar ≈ 14.5 psi; 1 psi ≈ 6.89 kPa. Planning midpoint for 225/55R17: 34 psi = 2.34 bar = 234 kPa.

kPaBarPSI
2072.0730
2142.1431
2212.2132
2282.2833
2342.3434
2412.4135
2482.4836
2552.5537
2622.6238
2692.6939
2762.7640
2832.8341
2902.9042
2962.9643
3033.0344
3103.1045
3173.1746

Estimated 225/55R17 pressure by load

Plus-sizing to 225/55R17 from a taller OEM tyre usually keeps the same placard if the load index is equal or higher.

ConditionFront (est.)Rear (est.)
Driver only / unladen34 psi / 2.34 bar / 234 kPa34 psi / 2.34 bar / 234 kPa
Typical occupancy35 psi / 2.41 bar / 241 kPa36 psi / 2.48 bar / 248 kPa
Motorway + luggage (sketch)36 psi / 2.48 bar / 248 kPa37 psi / 2.55 bar / 255 kPa

What 225/55R17 means

Read 225/55R17 as width / aspect R rim. Nothing in the size string is a pressure. Pressure lives on the car, not moulded as 205 or 55.

CUV 17-inch highway. Rim diameter 17 in; section 225 mm. Estimates on this page assume a typical load index for the SUV / crossover class.

Placard versus sidewall

The sidewall of a 225/55R17 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.

Temperature drift

Roughly 1 psi per 5–6 °C. The table uses 34 psi as a 20 °C baseline for 225/55R17.

AmbientGaugeBarkPaNote
−5 °C (hard frost)31 psi2.14 bar214 kPaGauge reads low; do not overfill once warm
0 °C32 psi2.21 bar221 kPaGauge reads low; do not overfill once warm
8 °C (UK winter morning)33 psi2.28 bar228 kPaGauge reads low; do not overfill once warm
20 °C (set cold here)34 psi2.34 bar234 kPaBaseline for this size sketch
30 °C36 psi2.48 bar248 kPaDo not bleed a hot 225/55R17
38 °C (heatwave tarmac)37 psi2.55 bar255 kPaDo not bleed a hot 225/55R17

How to set 225/55R17

  1. Park so the 225/55R17 tyres are cold (three hours, or less than about a mile).
  2. Read the door-pillar placard for that car — not the 225/55R17 sidewall maximum.
  3. If the sticker is missing, 34 psi / 2.34 bar is only a SUV / crossover planning figure for this size.
  4. Set all four with a calibrated gauge. A 3 psi miss on one corner shows up as a wander.
  5. Refit valve caps and reset TPMS if the handbook asks for a relearn.

Cars often seen on 225/55R17

These catalogue models are often seen on 225/55R17 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.

Nissan QashqaiFord KugaHyundai TucsonMazda CX-5

If the door sticker and this 225/55R17 page disagree, the sticker wins.

Questions about 225/55R17

What PSI should 225/55R17 tyres be?

A SUV / crossover planning figure is about 34 psi cold (2.34 bar / 234 kPa). Confirm on the vehicle placard — two cars can share 225/55R17 and not share a sticker.

Can I run 225/55R17 at a lower pressure for comfort?

Not as a habit. A soft 225/55R17 cooks the shoulders and dulls steering. Keep load index and stay on the placard.

Is the sidewall number correct for 225/55R17?

No. Sidewall PSI or kPa is a maximum for the carcass. Operating pressure is the door-pillar placard.

What is 225/55R17 in kPa?

234 kPa is the planning midpoint (100 kPa = 1 bar). 241 kPa is one PSI higher.

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.

Handbook: placard · bar vs PSI · cold inflation · all sizes