smart · forTwo · kPa

smart forTwo tyre pressure in kPa

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

kPa

231 / 231

2.31 / 2.31 bar · 32-35 / 32-35 psi

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

If your gauge only speaks kPa, aim near 231 / 231 for this forTwo, then fine-tune to the placard. Under-inflation cooks the shoulders of a forTwo; over-inflation wears the centre rib and bangs every cat’s eye.

kPa, bar and PSI

kPa-led conversions. 220 kPa is 2.2 bar and about 32 psi — handy if this forTwo sticker uses SI units.

kPa	Bar	PSI
207	2.07	30
221	2.21	32
228	2.28	33
231	2.31	33.5
241	2.41	35
248	2.48	36
262	2.62	38
276	2.76	40
303	3.03	44
345	3.45	50
414	4.14	60

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

If your smart forTwo no longer wears the OEM diameter, start at the row nearest 215/55R16 or 215/50R17 and confirm with the tyre maker’s load table.

Tyre size	Front PSI	Rear PSI	Front bar	Rear bar	Front kPa	Rear kPa	Note
215/55R16	34	35	2.34	2.41	234	241	Slightly wider 16-inch
215/50R17	35	35	2.41	2.41	241	241	Plus-size 17-inch
195/65R15	34	34	2.34	2.34	234	234	Very common compact
225/40R18	36	36	2.48	2.48	248	248	Low-profile 18-inch
225/45R17	35	35	2.41	2.41	241	241	Sport 17-inch
185/65R15	33	33	2.28	2.28	228	228	Small / older car
205/55R16	34	34	2.34	2.34	234	234	Typical mid-compact OEM
205/60R16	34	34	2.34	2.34	234	234	Taller 16-inch

smart forTwo placard versus sidewall

Sidewall PSI is a carcass maximum. Recommended operating pressure for this forTwo is the pillar sticker, near 34/34 psi.

Temperature drift

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

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

How to set the forTwo

Park the smart forTwo 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 32-35 psi / 2.2-2.4 bar front and 32-35 psi / 2.2-2.4 bar rear on this catalogue row.
Recheck all four. A 2 psi miss on a front-wheel drive forTwo is enough to feel a pull.
Refit valve caps and reset TPMS if the handbook asks for a relearn.

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	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	36 psi / 2.48 bar

smart notes

No special smart exception: the forTwo 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 smart forTwo 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 smart sticker and this page disagree, the sticker wins.

Other smart models

brabus forFour city-coupé/city-cabrio #3 crossblade #5 #1 roadster

Questions about this forTwo

Front versus rear on the smart forTwo?

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.

Is the sidewall number correct on a smart forTwo?

No. Sidewall PSI is a maximum. The forTwo placard is the operating target, near 32-35/32-35 psi.

When does TPMS warn on a smart forTwo?

Direct TPMS typically flags about 25% below placard — near 25 psi on this row. Fill to the sticker, not to the lamp.

How often should I check a forTwo?

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 forTwo?

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

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