Lexus · RC 300h · Bar

Lexus RC 300h tyre pressure in bar

Drivetrain: rear-wheel drive
Body: passenger car
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

2.3 bar is not 23 psi. On this RC 300h 2.2-2.4 bar converts to about 32-35 psi. Use the table, not a guess. Size estimates on this page include 215/50R17, 205/60R16 and 225/45R17 — interpolated from the catalogue midpoint, not a second factory sticker.

Bar, PSI and kPa

Bar-led conversions around the Lexus RC 300h. 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 RC 300h placard versus sidewall

Sidewall PSI is a carcass maximum. Recommended operating pressure for this RC 300h is the pillar sticker, near 34/34 psi.

Estimated pressure by tyre size (215/50R17 and others)

If your Lexus RC 300h no longer wears the OEM diameter, start at the row nearest 215/50R17 or 205/60R16 and confirm with the tyre maker’s load table.

Tyre size	Front PSI	Rear PSI	Front bar	Rear bar	Front kPa	Rear kPa	Note
215/50R17	35	35	2.41	2.41	241	241	Plus-size 17-inch
205/60R16	34	34	2.34	2.34	234	234	Taller 16-inch
225/45R17	35	35	2.41	2.41	241	241	Sport 17-inch
225/40R18	36	36	2.48	2.48	248	248	Low-profile 18-inch
215/55R16	34	35	2.34	2.41	234	241	Slightly wider 16-inch
245/40R18	36	36	2.48	2.48	248	248	Wide touring 18-inch
195/65R15	34	34	2.34	2.34	234	234	Very common compact
185/65R15	33	33	2.28	2.28	228	228	Small / older car

Load notes

Load moves the rear of a passenger car 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	38 psi / 2.62 bar

How to set the RC 300h

Measure before the school run, not after the M25.
Write LF / RF / RR / RL. Do not keep RC 300h 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 RC 300h.

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 RC 300h 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 RC 300h 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 RC 300h than nitrogen upsells.

Other Lexus models

GX 550 IS 220d GS 300 IS 200 GX 460 CT 200h IS 350 GS 350

Questions about this RC 300h

Front versus rear on the Lexus RC 300h?

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.

Is the sidewall number correct on a Lexus RC 300h?

No. Sidewall PSI is a maximum. The RC 300h placard is the operating target, near 32-35/32-35 psi.

When does TPMS warn on a Lexus RC 300h?

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

How often should I check a RC 300h?

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

What is that in bar and kPa for the RC 300h?

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

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