Cadillac · Optiq · Recommended

Official-style tyre pressure for the Cadillac Optiq

Drivetrain: front-wheel drive
Body: passenger car
PSI F / R: 32-35 / 32-35
Bar F / R: 2.2-2.4 / 2.2-2.4

psi

34 / 34

Catalogue mid-points, front / rear · 2.2-2.4 / 2.2-2.4 bar

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

Recommended pressure means the vehicle placard, not the tyre sidewall. For a Cadillac Optiq the catalogue proxy is 32-35/32-35 psi (2.2-2.4/2.2-2.4 bar). TPMS typically warns near 25 psi (about 25% below target). That is already a soft tyre, not a fill target.

How to set the Optiq

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

Cadillac Optiq placard versus sidewall

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

Estimated pressure by tyre size (225/50R17 and others)

If your Cadillac Optiq no longer wears the OEM diameter, start at the row nearest 225/50R17 or 215/50R17 and confirm with the tyre maker’s load table.

Tyre size	Front PSI	Rear PSI	Front bar	Rear bar	Front kPa	Rear kPa	Note
225/50R17	35	35	2.41	2.41	241	241	Touring 17-inch
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
245/40R18	36	36	2.48	2.48	248	248	Wide touring 18-inch
215/55R16	34	35	2.34	2.41	234	241	Slightly wider 16-inch
225/40R18	36	36	2.48	2.48	248	248	Low-profile 18-inch
225/45R17	35	35	2.41	2.41	241	241	Sport 17-inch
205/55R16	34	34	2.34	2.34	234	234	Typical mid-compact OEM

PSI, bar and kPa

PSI-led conversions for the Cadillac Optiq band (32-35 / 32-35).

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

Pressure against load

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	34 psi / 2.34 bar	35 psi / 2.41 bar
Motorway + luggage	35 psi / 2.41 bar	38 psi / 2.62 bar

Temperature drift

Roughly 1 psi per 5–6 °C. The table uses 34 psi as a 20 °C baseline for this Optiq.

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

Cadillac notes

No special Cadillac exception: the Optiq 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 Cadillac Optiq 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 Optiq than nitrogen upsells.

Other Cadillac models

ATS Allante DTS Fleetwood Vistiq BLS STS Lyriq

Questions about this Optiq

What PSI if I plus-size toward 205/60R16?

Keep load index at or above OEM. Low-profile sizes usually stay at or slightly above the placard. Use 225/50R17, 215/50R17 and 205/60R16 as a planning band.

Is the sidewall number correct on a Cadillac Optiq?

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

How often should I check a Optiq?

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

When does TPMS warn on a Cadillac Optiq?

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

Front versus rear on the Cadillac Optiq?

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.

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