235/50R18 · SUV / crossover · kPa
241 kPa for 235/50R18 tyres
- Size
- 235/50R18
- Class
- SUV / crossover
- Planning PSI
- 35
- Planning bar
- 2.41
kPa
241
2.41 bar · 35 psi · 100 kPa = 1 bar
235/50R18 · 35 psi · 2.41 bar · 241 kPa — estimates. Placard wins.
Kilopascals show up on some Asian stickers and ISO sheets. 241 kPa is the planning midpoint for 235/50R18 (2.41 bar / 35 psi). 100 kPa = 1 bar. 18-inch CUV. These rows are estimates interpolated for the size, not OEM for a named VIN.
kPa, bar and PSI
Convert around the 235/50R18 band. 2.41 bar is about 35 psi — not 23, not 33 unless the maths says so.
| kPa | Bar | PSI |
|---|---|---|
| 214 | 2.14 | 31 |
| 221 | 2.21 | 32 |
| 228 | 2.28 | 33 |
| 234 | 2.34 | 34 |
| 241 | 2.41 | 35 |
| 248 | 2.48 | 36 |
| 255 | 2.55 | 37 |
| 262 | 2.62 | 38 |
| 269 | 2.69 | 39 |
| 276 | 2.76 | 40 |
| 283 | 2.83 | 41 |
| 290 | 2.90 | 42 |
| 296 | 2.96 | 43 |
| 303 | 3.03 | 44 |
| 310 | 3.10 | 45 |
| 317 | 3.17 | 46 |
| 324 | 3.24 | 47 |
Estimated 235/50R18 pressure by load
These 235/50R18 load steps are ± a few PSI from 35. They are not a licence to ignore a printed second column on a van or estate.
| Condition | Front (est.) | Rear (est.) |
|---|---|---|
| Driver only / unladen | 35 psi / 2.41 bar / 241 kPa | 37 psi / 2.55 bar / 255 kPa |
| Typical occupancy | 35 psi / 2.41 bar / 241 kPa | 38 psi / 2.62 bar / 262 kPa |
| Motorway + luggage (sketch) | 36 psi / 2.48 bar / 248 kPa | 39 psi / 2.69 bar / 269 kPa |
What 235/50R18 means
235/50R18 means a 235 millimetre section width, a sidewall that is 50 percent of that width, on a 18-inch rim. The R is radial construction.
18-inch CUV. Rim diameter 18 in; section 235 mm. Estimates on this page assume a typical load index for the SUV / crossover class.
Placard versus sidewall
If a forum says “all 235/50R18 run 35 psi”, ignore it. A Qashqai and a Golf can share a size and not share a sticker.
Temperature drift
Roughly 1 psi per 5–6 °C. The table uses 35 psi as a 20 °C baseline for 235/50R18.
| Ambient | Gauge | Bar | kPa | Note |
|---|---|---|---|---|
| −5 °C (hard frost) | 32 psi | 2.21 bar | 221 kPa | Gauge reads low; do not overfill once warm |
| 0 °C | 33 psi | 2.28 bar | 228 kPa | Gauge reads low; do not overfill once warm |
| 8 °C (UK winter morning) | 34 psi | 2.34 bar | 234 kPa | Gauge reads low; do not overfill once warm |
| 20 °C (set cold here) | 35 psi | 2.41 bar | 241 kPa | Baseline for this size sketch |
| 30 °C | 37 psi | 2.55 bar | 255 kPa | Do not bleed a hot 235/50R18 |
| 38 °C (heatwave tarmac) | 38 psi | 2.62 bar | 262 kPa | Do not bleed a hot 235/50R18 |
How to set 235/50R18
- Park so the 235/50R18 tyres are cold (three hours, or less than about a mile).
- Read the door-pillar placard for that car — not the 235/50R18 sidewall maximum.
- If the sticker is missing, 35 psi / 2.41 bar is only a SUV / crossover planning figure for this size.
- Set all four with a calibrated gauge. A 3 psi miss on one corner shows up as a wander.
- Refit valve caps and reset TPMS if the handbook asks for a relearn.
Cars often seen on 235/50R18
These catalogue models are often seen on 235/50R18 or a close OEM neighbour. Open the vehicle chart for axle-specific PSI and bar.
If the door sticker and this 235/50R18 page disagree, the sticker wins.
Questions about 235/50R18
What is 235/50R18 in bar?
35 psi is 2.41 bar. Add a tenth of a bar if the placard’s laden column is higher, which is common on vans that wear this size.
What is 235/50R18 in kPa?
241 kPa is the planning midpoint (100 kPa = 1 bar). 248 kPa is one PSI higher.
Is 235/50R18 the same as a plus-size swap?
Only if that is the size you fitted. Overall diameter should stay close to OEM. Pressure still follows the car, with load index at or above original.
When does TPMS warn on 235/50R18?
Direct TPMS typically flags about 25% below target — near 26 psi if you were aiming at 35. Fill to the sticker, not to the lamp.
What PSI should 235/50R18 tyres be?
A SUV / crossover planning figure is about 35 psi cold (2.41 bar / 241 kPa). Confirm on the vehicle placard — two cars can share 235/50R18 and not share a sticker.
Handbook: placard · bar vs PSI · cold inflation · all sizes