Lexus · RX 450h · Bar

Recommended bar for a Lexus RX 450h

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

A all-wheel drive Lexus RX 450h still wants even corners. 2.2-2.4 vs 2.2-2.4 is an axle split, not a left-right split. Under-inflation cooks the shoulders of a RX 450h; over-inflation wears the centre rib and bangs every cat’s eye. 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 Lexus RX 450h. 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

Lexus RX 450h placard versus sidewall

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

Estimated pressure by tyre size (225/60R18 and others)

Planning cold pressures for sizes often seen on a SUV / crossover. This RX 450h sample opens with 225/60R18, then 225/65R17 and 255/50R20.

Tyre size	Front PSI	Rear PSI	Front bar	Rear bar	Front kPa	Rear kPa	Note
225/60R18	35	35	2.41	2.41	241	241	Highway 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
245/55R19	36	36	2.48	2.48	248	248	Low-profile 19-inch
235/60R18	36	36	2.48	2.48	248	248	Plus-size 18-inch
245/60R18	36	37	2.48	2.55	248	255	Heavier CUV
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

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	35 psi / 2.41 bar	36 psi / 2.48 bar
Motorway + luggage	36 psi / 2.48 bar	36 psi / 2.48 bar

How to set the RX 450h

Measure before the school run, not after the M25.
Write LF / RF / RR / RL. Do not keep RX 450h 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 RX 450h.

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

Lexus notes

No special Lexus exception: the RX 450h 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 Lexus RX 450h 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.

If the Lexus sticker and this page disagree, the sticker wins.

Other Lexus models

GS 430 IS 220d LC 500 IS 250 GS 460 GS 350 LC 500h IS 200

Questions about this RX 450h

Is the sidewall number correct on a Lexus RX 450h?

No. Sidewall PSI is a maximum. The RX 450h placard is the operating target, near 32-35/32-35 psi.

What tyre pressure should a Lexus RX 450h use?

Catalogue reference is 32-35 psi front and 32-35 psi rear (2.2-2.4 / 2.2-2.4 bar), cold. Confirm on the door-pillar placard.

Front versus rear on the Lexus RX 450h?

This row is 32-35 F / 32-35 R. Even when they match, a laden rear can justify a higher number if the sticker prints one.

What is that in bar and kPa for the RX 450h?

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

How often should I check a RX 450h?

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