RAM · Promaster · Front
RAM Promaster front tyres: 32-35 psi / 2.2-2.4 bar
- Drivetrain
- front-wheel drive
- Body
- van
- PSI F / R
- 32-35 / 32-35
- Bar F / R
- 2.2-2.4 / 2.2-2.4
psi front
34
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 RAM Promaster steers and, on front-wheel drive cars, often pulls as well. Catalogue front pressure is 32-35 psi / 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. Commercial and load-biased bodies like this van often need a higher rear; LT or C-type sizes such as 225/65R16 are not filled like a Fiesta.
RAM Promaster placard versus sidewall
If the RAM sticker is painted over, the handbook is next. This website is a map, not a replacement VIN label.
Estimated pressure by tyre size (LT215/85R16 and others)
If your RAM Promaster no longer wears the OEM diameter, start at the row nearest LT215/85R16 or 235/65R16 and confirm with the tyre maker’s load table.
| Tyre size | Front PSI | Rear PSI | Front bar | Rear bar | Front kPa | Rear kPa | Note |
|---|---|---|---|---|---|---|---|
| LT215/85R16 | 40 | — | 2.76 | — | 276 | — | LT commercial |
| 235/65R16 | 36 | — | 2.48 | — | 248 | — | Loaded van |
| 225/65R16 | 35 | — | 2.41 | — | 241 | — | Common transaxle van |
| 225/75R16 | 36 | — | 2.48 | — | 248 | — | Taller load range |
| 215/65R16 | 34 | — | 2.34 | — | 234 | — | Compact van |
| 195/75R16C | 38 | — | 2.62 | — | 262 | — | C-type commercial |
| 215/75R16C | 39 | — | 2.69 | — | 269 | — | C-type 215 |
| 235/60R17 | 35 | — | 2.41 | — | 241 | — | Plus-size van |
Pressure against load
Load moves the rear of a van 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 |
| Payload / towing | 35 psi / 2.41 bar | 38 psi / 2.62 bar |
Steering feel on the Promaster lives on this axle. Do not drop front pressure to “soften” a plus-size 225/65R16; you will roll the sidewall in a roundabout.
How to set the Promaster
- Measure before the school run, not after the M25.
- Write LF / RF / RR / RL. Do not keep Promaster 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 RAM Promaster 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 Promaster.
| 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 |
RAM notes
No special RAM exception: the Promaster 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 RAM Promaster 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.
Keep the RAM Promaster on the printed band; use LT215/85R16 and 225/65R16 only as a map for non-OEM wheels.
Other RAM models
Questions about this Promaster
Front versus rear on the RAM Promaster?
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 is that in bar and kPa for the Promaster?
Mid-points are about 2.31 bar (231 kPa) front and 2.31 bar (231 kPa) rear.
What tyre pressure should a RAM Promaster 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.
How often should I check a Promaster?
Monthly, before a long trip, and after a 10 °C weather swing. Include a full-size spare.
What PSI if I plus-size toward 225/65R16?
Keep load index at or above OEM. Low-profile sizes usually stay at or slightly above the placard. Use LT215/85R16, 235/65R16 and 225/65R16 as a planning band.
Handbook: placard · bar vs PSI · front vs rear · cold inflation