Caravans-Wohnm · Ultra · PSI
Caravans-Wohnm Ultra inflation in PSI (45-65 front, 45-65 rear)
- 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
psi
55 / 55
Catalogue mid-points, front / rear · 3.1-4.5 / 3.1-4.5 bar
45-65 psi F · 45-65 psi R · 3.1-4.5 / 3.1-4.5 bar · 379/379 kPa
A Caravans-Wohnm Ultra run at sidewall-max (often 44–51 psi) is over-inflated for this passenger car. The operating PSI is 45-65/45-65. TPMS typically warns near 41 psi (about 25% below target). That is already a soft tyre, not a fill target.
Caravans-Wohnm Ultra placard versus sidewall
Sidewall PSI is a carcass maximum. Recommended operating pressure for this Ultra is the pillar sticker, near 55/55 psi.
PSI, bar and kPa
PSI-led conversions for the Caravans-Wohnm Ultra band (45-65 / 45-65).
| PSI | Bar | kPa |
|---|---|---|
| 50 | 3.45 | 345 |
| 55 | 3.79 | 379 |
| 60 | 4.14 | 414 |
| 65 | 4.48 | 448 |
Estimated pressure by tyre size (225/45R17 and others)
If your Caravans-Wohnm Ultra no longer wears the OEM diameter, start at the row nearest 225/45R17 or 225/50R17 and confirm with the tyre maker’s load table.
| Tyre size | Front PSI | Rear PSI | Front bar | Rear bar | Front kPa | Rear kPa | Note |
|---|---|---|---|---|---|---|---|
| 225/45R17 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Sport 17-inch |
| 225/50R17 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Touring 17-inch |
| 225/40R18 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Low-profile 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 |
| 245/40R18 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Wide touring 18-inch |
| 185/65R15 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Small / older car |
| 195/65R15 | 50 | 50 | 3.45 | 3.45 | 345 | 345 | Very common compact |
How to set the Ultra
- Measure before the school run, not after the M25.
- Write LF / RF / RR / RL. Do not keep Ultra numbers in your head.
- Add air in short bursts toward 55 psi (3.79 bar) front and 55 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.
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 |
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.
A cheap gauge and a monthly habit will do more for this Ultra than nitrogen upsells.
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 PSI if I plus-size toward 225/40R18?
Keep load index at or above OEM. Low-profile sizes usually stay at or slightly above the placard. Use 225/45R17, 225/50R17 and 225/40R18 as a planning band.
Front versus rear on the Caravans-Wohnm Ultra?
This row is 45-65 F / 45-65 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 Ultra?
Mid-points are about 3.79 bar (379 kPa) front and 3.79 bar (379 kPa) rear.
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.
Handbook: placard · bar vs PSI · front vs rear · cold inflation