Opel · Diplomat · Front

Opel Diplomat front tyre pressure

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 front

2.31 bar · 231 kPa at the steering axle

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

The front axle of a Opel Diplomat steers and, on front-wheel drive cars, often pulls as well. Catalogue front pressure is 32-35 psi / 2.2-2.4 bar. Size estimates on this page include 215/55R16, 195/65R15 and 205/60R16 — interpolated from the catalogue midpoint, not a second factory sticker.

Opel Diplomat placard versus sidewall

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

Estimated pressure by tyre size (215/55R16 and others)

Planning cold pressures for sizes often seen on a passenger car. This Diplomat sample opens with 215/55R16, then 195/65R15 and 205/60R16.

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

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	37 psi / 2.55 bar

Steering feel on the Diplomat lives on this axle. Do not drop front pressure to “soften” a plus-size 205/60R16; you will roll the sidewall in a roundabout.

How to set the Diplomat

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

PSI, bar and kPa

PSI-led conversions for the Opel Diplomat 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

Temperature drift

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

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

Opel notes

No special Opel exception: the Diplomat 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 Opel Diplomat 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 Opel sticker and this page disagree, the sticker wins.

Other Opel models

Arena Cascada Corsa-e Corsa Campo Combo Grandland X Grandland

Questions about this Diplomat

Front versus rear on the Opel Diplomat?

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 tyre pressure should a Opel Diplomat 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.

What is that in bar and kPa for the Diplomat?

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

How often should I check a Diplomat?

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

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 215/55R16, 195/65R15 and 205/60R16 as a planning band.

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