Caravans-Wohnm · Ultra · Bar
Caravans-Wohnm Ultra bar chart (3.1-4.5 / 3.1-4.5)
- Drivetrain
- front-wheel drive
- Body
- passenger car
- PSI F / R
- 45-65 / 45-65
- Bar F / R
- 3.1-4.5 / 3.1-4.5
bar
3.79 / 3.79
45-65 / 45-65 psi · 379 / 379 kPa
45-65 psi F · 45-65 psi R · 3.1-4.5 / 3.1-4.5 bar · 379/379 kPa
European and UK handbooks usually quote bar. The Caravans-Wohnm Ultra catalogue is 3.1-4.5 bar front and 3.1-4.5 bar rear (midpoint 3.79 / 3.79). Under-inflation cooks the shoulders of a Ultra; over-inflation wears the centre rib and bangs every cat’s eye.
Bar, PSI and kPa
Bar-led conversions around the Caravans-Wohnm Ultra. 3.1-4.5 bar is not “45-65 divided by ten”.
| Bar | PSI | kPa |
|---|---|---|
| 3.45 | 50 | 345 |
| 3.79 | 55 | 379 |
| 4.14 | 60 | 414 |
| 4.48 | 65 | 448 |
Caravans-Wohnm Ultra placard versus sidewall
If the Caravans-Wohnm sticker is painted over, the handbook is next. This website is a map, not a replacement VIN label.
Estimated pressure by tyre size (225/40R18 and others)
If your Caravans-Wohnm Ultra no longer wears the OEM diameter, start at the row nearest 225/40R18 or 245/40R18 and confirm with the tyre maker’s load table.
| Tyre size | Front PSI | Rear PSI | Front bar | Rear bar | Front kPa | Rear kPa | Note |
|---|---|---|---|---|---|---|---|
| 225/40R18 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Low-profile 18-inch |
| 245/40R18 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Wide touring 18-inch |
| 205/60R16 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Taller 16-inch |
| 205/55R16 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Typical mid-compact OEM |
| 195/65R15 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Very common compact |
| 225/45R17 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Sport 17-inch |
| 225/50R17 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Touring 17-inch |
| 215/55R16 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Slightly wider 16-inch |
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 | 50 psi / 3.45 bar | 50 psi / 3.45 bar |
| Full occupancy | 50 psi / 3.45 bar | 50 psi / 3.45 bar |
| Motorway + luggage | 50 psi / 3.45 bar | 50 psi / 3.45 bar |
How to set the Ultra
- Park the Caravans-Wohnm Ultra for at least three hours (cold tyres).
- Use a calibrated gauge, not the only meter on a forecourt hose.
- Set the placard for that axle — about 45-65 psi / 3.1-4.5 bar front and 45-65 psi / 3.1-4.5 bar rear on this catalogue row.
- Recheck all four. A 2 psi miss on a front-wheel drive Ultra is enough to feel a pull.
- Refit valve caps and reset TPMS if the handbook asks for a relearn.
Temperature drift
Roughly 1 psi per 5–6 °C. The table uses 55 psi as a 20 °C baseline for this Ultra.
| Ambient | Gauge (front mid) | Bar | kPa | Note |
|---|---|---|---|---|
| −5 °C (hard frost) | 52 psi | 3.59 bar | 359 kPa | Gauge reads low; do not overfill once warm |
| 0 °C | 53 psi | 3.65 bar | 365 kPa | Gauge reads low; do not overfill once warm |
| 8 °C (UK winter morning) | 54 psi | 3.72 bar | 372 kPa | Gauge reads low; do not overfill once warm |
| 20 °C (set cold here) | 55 psi | 3.79 bar | 379 kPa | Baseline |
| 30 °C | 57 psi | 3.93 bar | 393 kPa | Do not bleed a hot tyre |
| 38 °C (heatwave tarmac) | 58 psi | 4 bar | 400 kPa | Do not bleed a hot tyre |
Caravans-Wohnm notes
No special Caravans-Wohnm exception: the Ultra 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 Caravans-Wohnm Ultra usually follows the higher axle (often the rear, near 45-65 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.
Keep the Caravans-Wohnm Ultra on the printed band; use 225/40R18 and 205/60R16 only as a map for non-OEM wheels.
Other Caravans-Wohnm models
Questions about this Ultra
Should I bleed pressure after a motorway run?
No. Heat raises the gauge. Set cold only. Bleeding a hot tyre leaves it low the next morning.
What tyre pressure should a Caravans-Wohnm Ultra use?
Catalogue reference is 45-65 psi front and 45-65 psi rear (3.1-4.5 / 3.1-4.5 bar), cold. Confirm on the door-pillar placard.
Is the sidewall number correct on a Caravans-Wohnm Ultra?
No. Sidewall PSI is a maximum. The Ultra placard is the operating target, near 45-65/45-65 psi.
How often should I check a Ultra?
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 Ultra?
Mid-points are about 3.79 bar (379 kPa) front and 3.79 bar (379 kPa) rear.
Handbook: placard · bar vs PSI · front vs rear · cold inflation