Infiniti · QX50 · Bar

Recommended bar for a Infiniti QX50

Drivetrain: all-wheel drive
Body: SUV / crossover
PSI F / R: 32-35 / 32-35
Bar F / R: 2.2-2.4 / 2.2-2.4

bar

2.31 / 2.31

32-35 / 32-35 psi · 231 / 231 kPa

32-35 psi F · 32-35 psi R · 2.2-2.4 / 2.2-2.4 bar · 231/231 kPa

European and UK handbooks usually quote bar. The Infiniti QX50 catalogue is 2.2-2.4 bar front and 2.2-2.4 bar rear (midpoint 2.31 / 2.31). A 10 °C overnight drop takes roughly 1 psi (0.07 bar) off a closed Infiniti tyre. Keep side-to-side spread inside about 2 psi so the all-wheel drive hardware is not working on a radius mismatch.

Bar, PSI and kPa

Bar-led conversions around the Infiniti QX50. 2.2-2.4 bar is not “32-35 divided by ten”.

Bar	PSI	kPa
2.07	30	207
2.21	32	221
2.28	33	228
2.31	33.5	231
2.41	35	241
2.48	36	248
2.62	38	262
2.76	40	276
3.03	44	303
3.45	50	345
4.14	60	414

Infiniti QX50 placard versus sidewall

If the Infiniti sticker is painted over, the handbook is next. This website is a map, not a replacement VIN label.

Estimated pressure by tyre size (235/60R18 and others)

If your Infiniti QX50 no longer wears the OEM diameter, start at the row nearest 235/60R18 or 215/70R16 and confirm with the tyre maker’s load table.

Tyre size	Front PSI	Rear PSI	Front bar	Rear bar	Front kPa	Rear kPa	Note
235/60R18	36	36	2.48	2.48	248	248	Plus-size 18-inch
215/70R16	34	34	2.34	2.34	234	234	Compact crossover
235/65R17	35	36	2.41	2.48	241	248	Mid-size SUV
225/60R18	35	35	2.41	2.41	241	241	Highway CUV
245/55R19	36	36	2.48	2.48	248	248	Low-profile 19-inch
245/60R18	36	37	2.48	2.55	248	255	Heavier CUV
225/65R17	35	35	2.41	2.41	241	241	Very common 17-inch
255/50R20	37	37	2.55	2.55	255	255	20-inch plus-size

Load notes

Load moves the rear of a SUV / crossover first. If the factory placard already has a “laden” column, use that instead of these sketches.

Condition	Front (est.)	Rear (est.)
Driver only	34 psi / 2.34 bar	34 psi / 2.34 bar
Full occupancy	34 psi / 2.34 bar	35 psi / 2.41 bar
Motorway + luggage	35 psi / 2.41 bar	36 psi / 2.48 bar

How to set the QX50

Measure before the school run, not after the M25.
Write LF / RF / RR / RL. Do not keep QX50 numbers in your head.
Add air in short bursts toward 34 psi (2.31 bar) front and 34 psi rear.
If one corner 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 this QX50.

Ambient	Gauge (front mid)	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
30 °C	36 psi	2.48 bar	248 kPa	Do not bleed a hot tyre
38 °C (heatwave tarmac)	37 psi	2.55 bar	255 kPa	Do not bleed a hot tyre

Infiniti notes

No special Infiniti exception: the QX50 uses the door-pillar placard. Size estimates on this page only help if you have left the original load index behind.

Spare and inflator kit

A matching full-size spare on the Infiniti QX50 usually follows the higher axle (often the rear, near 32-35 psi). A space-saver is commonly 60 psi / 4.1 bar — read that tyre’s own sidewall. An inflator kit is not a spare; check the sealant date.

A cheap gauge and a monthly habit will do more for this QX50 than nitrogen upsells.

Other Infiniti models

QX56 QX30 G25 EX30 G35 EX25 I35 Q80

Questions about this QX50

When does TPMS warn on a Infiniti QX50?

Direct TPMS typically flags about 25% below placard — near 25 psi on this row. Fill to the sticker, not to the lamp.

What PSI if I plus-size toward 235/65R17?

Keep load index at or above OEM. Low-profile sizes usually stay at or slightly above the placard. Use 235/60R18, 215/70R16 and 235/65R17 as a planning band.

Is the sidewall number correct on a Infiniti QX50?

No. Sidewall PSI is a maximum. The QX50 placard is the operating target, near 32-35/32-35 psi.

What is that in bar and kPa for the QX50?

Mid-points are about 2.31 bar (231 kPa) front and 2.31 bar (231 kPa) rear.

How often should I check a QX50?

Monthly, before a long trip, and after a 10 °C weather swing. Include a full-size spare.

Handbook: placard · bar vs PSI · front vs rear · cold inflation