Porsche Boxster Tyre Pressures

Manufacturer-recommended front and rear pressures for every Boxster tyre size and variant — in psi, bar or kPa.

5
Wheel sizes
4
Model variants
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Find the right pressure for your Porsche Boxster

Not sure of your wheel size? It's the last number in the tyre size on your sidewall.

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How to check

Checking your Porsche Boxster tyre pressure

Two minutes at home or on a garage forecourt is all it takes.

Find your pressure

Look up your tyre size in the pressure chart, or check the sticker inside the driver's door jamb or fuel filler flap.

Check the tyres cold

Recommended figures are cold pressures — measure before driving, or at least a couple of hours after a journey.

Top up all four monthly

Check every tyre (and the spare) once a month and before long trips, then refit the valve caps securely.

Tyre Pressure Chart

Recommended pressures for your Porsche Boxster

Cold inflation pressures as recommended by Porsche. Use the laden figures when the car is fully loaded with passengers or luggage.

Tyre sizeFrontFront (loaded)RearRear (loaded)
205/55 R16 89Y BOXSTER 35 psi2.4 bar241 kPa 35 psi2.4 bar241 kPa ––– –––
205/55 R16 89Y BOXSTER 24V 35 psi2.4 bar241 kPa 35 psi2.4 bar241 kPa ––– –––
225/50 R16 89Y BOXSTER ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
225/50 R16 89Y BOXSTER 24V ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
205/50 R17 89Y BOXSTER 35 psi2.4 bar241 kPa 35 psi2.4 bar241 kPa ––– –––
205/50 R17 89Y BOXSTER 24V 35 psi2.4 bar241 kPa 35 psi2.4 bar241 kPa ––– –––
205/55 R17 91V BOXSTER 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
205/55 R17 91Y BOXSTER 35 psi2.4 bar241 kPa 35 psi2.4 bar241 kPa ––– –––
205/55 R17 95Y BOXSTER 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
205/55 R17 91Y BOXSTER 24V 35 psi2.4 bar241 kPa 35 psi2.4 bar241 kPa ––– –––
235/50 R17 96V BOXSTER ––– ––– 30 psi2.1 bar207 kPa 30 psi2.1 bar207 kPa
235/50 R17 91Y BOXSTER ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
235/50 R17 96Y BOXSTER ––– ––– 30 psi2.1 bar207 kPa 30 psi2.1 bar207 kPa
235/50 R17 91Y BOXSTER 24V ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
235/50 R17 96Y BOXSTER 24V ––– ––– 36 psi2.5 bar248 kPa 36 psi2.5 bar248 kPa
255/40 R17 89Y BOXSTER ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
255/40 R17 89Y BOXSTER 24V ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
225/40 R18 88Y BOXSTER 35 psi2.4 bar241 kPa 35 psi2.4 bar241 kPa ––– –––
225/40 R18 88Y BOXSTER 24V 35 psi2.4 bar241 kPa 35 psi2.4 bar241 kPa ––– –––
225/40 R18 93Y BOXSTER 24V 29 psi2.0 bar200 kPa ––– ––– –––
235/40 R18 91V BOXSTER 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/40 R18 95V BOXSTER 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/40 R18 91Y BOXSTER 35 psi2.4 bar241 kPa 35 psi2.4 bar241 kPa ––– –––
235/40 R18 91V BOXSTER 24V 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/40 R18 95V BOXSTER 24V 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/40 R18 91Y BOXSTER 24V 29 psi2.0 bar200 kPa 35 psi2.4 bar241 kPa ––– –––
235/40 R18 91V BOXSTER SPYDER 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/40 R18 95V BOXSTER SPYDER 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/45 R18 88Y BOXSTER 29 psi2.0 bar200 kPa ––– ––– –––
235/45 R18 98V BOXSTER 24V 29 psi2.0 bar200 kPa ––– ––– –––
235/45 R18 88Y BOXSTER 24V 33 psi2.3 bar228 kPa ––– ––– –––
235/45 R18 94Y BOXSTER 24V 29 psi2.0 bar200 kPa ––– ––– –––
255/40 R18 95V BOXSTER ––– ––– 30 psi2.1 bar207 kPa 30 psi2.1 bar207 kPa
255/40 R18 99V BOXSTER ––– ––– 31 psi2.1 bar214 kPa 31 psi2.1 bar214 kPa
255/40 R18 95V BOXSTER 24V ––– ––– 31 psi2.1 bar214 kPa 31 psi2.1 bar214 kPa
255/40 R18 99V BOXSTER 24V ––– ––– 31 psi2.1 bar214 kPa 31 psi2.1 bar214 kPa
255/40 R18 95V BOXSTER SPYDER ––– ––– 31 psi2.1 bar214 kPa 31 psi2.1 bar214 kPa
255/40 R18 99V BOXSTER SPYDER ––– ––– 31 psi2.1 bar214 kPa 31 psi2.1 bar214 kPa
265/35 R18 88Y BOXSTER ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
265/35 R18 88Y BOXSTER 24V ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
265/35 R18 97Y BOXSTER 24V ––– ––– 35 psi2.4 bar241 kPa –––
265/40 R18 101Y BOXSTER ––– ––– 30 psi2.1 bar207 kPa 30 psi2.1 bar207 kPa
265/40 R18 91Y BOXSTER ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
265/40 R18 97Y BOXSTER ––– ––– 35 psi2.4 bar241 kPa –––
265/40 R18 101Y BOXSTER 24V ––– ––– 30 psi2.1 bar207 kPa 30 psi2.1 bar207 kPa
265/40 R18 91Y BOXSTER 24V ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
265/40 R18 97Y BOXSTER 24V ––– ––– 35 psi2.4 bar241 kPa –––
265/45 R18 95Y BOXSTER ––– ––– 35 psi2.4 bar241 kPa –––
265/45 R18 101V BOXSTER 24V ––– ––– 35 psi2.4 bar241 kPa –––
265/45 R18 101Y BOXSTER 24V ––– ––– 35 psi2.4 bar241 kPa –––
265/45 R18 95Y BOXSTER 24V ––– ––– 33 psi2.3 bar228 kPa –––
235/35 R19 87Y BOXSTER 35 psi2.4 bar241 kPa 35 psi2.4 bar241 kPa ––– –––
235/35 R19 91Y BOXSTER 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/35 R19 87Y BOXSTER 24V 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/35 R19 91Y BOXSTER 24V 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/35 R19 87Y BOXSTER SPYDER 32 psi2.2 bar221 kPa 29 psi2.0 bar200 kPa ––– –––
235/35 R19 91Y BOXSTER SPYDER 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/40 R19 88Y BOXSTER 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
235/40 R19 88Y BOXSTER 24V 33 psi2.3 bar228 kPa 29 psi2.0 bar200 kPa ––– –––
235/40 R19 92Y BOXSTER 24V 29 psi2.0 bar200 kPa 29 psi2.0 bar200 kPa ––– –––
265/35 R19 87Y BOXSTER ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
265/35 R19 94Y BOXSTER ––– ––– 30 psi2.1 bar207 kPa 30 psi2.1 bar207 kPa
265/35 R19 97Y BOXSTER ––– ––– 36 psi2.5 bar248 kPa –––
265/35 R19 87Y BOXSTER 24V ––– ––– 32 psi2.2 bar221 kPa 32 psi2.2 bar221 kPa
265/35 R19 93Y BOXSTER 24V ––– ––– 36 psi2.5 bar248 kPa –––
265/35 R19 94Y BOXSTER 24V ––– ––– 31 psi2.1 bar214 kPa 31 psi2.1 bar214 kPa
265/35 R19 97Y BOXSTER 24V ––– ––– 36 psi2.5 bar248 kPa –––
265/35 R19 94Y BOXSTER SPYDER ––– ––– 31 psi2.1 bar214 kPa 31 psi2.1 bar214 kPa
265/35 R19 97Y BOXSTER SPYDER ––– ––– 36 psi2.5 bar248 kPa –––
265/40 R19 95Y BOXSTER ––– ––– 30 psi2.1 bar207 kPa 30 psi2.1 bar207 kPa
265/40 R19 102Y BOXSTER 24V ––– ––– 30 psi2.1 bar207 kPa 30 psi2.1 bar207 kPa
265/40 R19 95Y BOXSTER 24V ––– ––– 33 psi2.3 bar228 kPa 30 psi2.1 bar207 kPa
235/35 R20 88Y BOXSTER 33 psi2.3 bar228 kPa 33 psi2.3 bar228 kPa ––– –––
235/35 R20 88Y BOXSTER 24V 33 psi2.3 bar228 kPa 33 psi2.3 bar228 kPa ––– –––
235/35 R20 88Y BOXSTER GTS 33 psi2.3 bar228 kPa 33 psi2.3 bar228 kPa ––– –––
265/35 R20 95Y BOXSTER ––– ––– 33 psi2.3 bar228 kPa 33 psi2.3 bar228 kPa
265/35 R20 95Y BOXSTER 24V ––– ––– 33 psi2.3 bar228 kPa 33 psi2.3 bar228 kPa
265/35 R20 99Y BOXSTER 24V ––– ––– 33 psi2.3 bar228 kPa 33 psi2.3 bar228 kPa
265/35 R20 95Y BOXSTER GTS ––– ––– 33 psi2.3 bar228 kPa 33 psi2.3 bar228 kPa

Always double-check against the tyre placard inside the driver's door or your Porsche handbook — pressures can vary by exact specification and year.

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Why it matters

The right pressure pays for itself

Tyres naturally lose around 1–2 psi a month, and more in cold weather — so even careful drivers end up under-inflated. Running your Boxster below Porsche's recommended pressure increases rolling resistance, which means more fuel burned, faster shoulder wear and longer braking distances in the wet.

Over-inflating isn't the answer either: too much air shrinks the tyre's contact patch, wearing the centre of the tread and making grip and ride quality worse. The recommended figures in the chart are the sweet spot — and if you're carrying a full load of passengers or luggage, switch to the laden values before you set off.

How pressure shapes your grip on the road

Under-inflated Only the shoulders touch — vague steering, extra fuel, hot edges
Correct pressure Full, even contact — best grip, wear and fuel economy
Over-inflated Just the centre grips — harsher ride, faster middle wear

The red zones are where a mis-inflated tyre carries the load — and where it wears out first.

Help & Advice

Tyre pressure questions, answered

What tyre pressure should a Porsche Boxster be?
It depends on your tyre size and variant — most Boxster fitments sit roughly between 30 and 38 psi (about 2.1–2.6 bar). Use the chart on this page to find your exact size, and confirm against the sticker inside the driver's door jamb or your handbook.
Where do I find the recommended pressure on the car?
Most Porsche models have a tyre placard inside the driver's door jamb; some print it inside the fuel filler flap or glovebox lid. It lists front and rear pressures for each approved tyre size, including fully-laden figures. The owner's handbook has the same table.
When should I use the laden pressures?
Use the laden (loaded) figures when the car is carrying close to a full load — four or five occupants, a packed boot, or towing. The extra pressure supports the added weight and keeps the car stable. Drop back to the normal figures once you've unloaded.
What's the difference between psi, bar and kPa?
They're just different units for the same pressure. UK forecourt gauges usually read psi (pounds per square inch), European handbooks often quote bar, and kPa (kilopascals) appears on many door stickers. 1 bar = 14.5 psi = 100 kPa — or simply switch units on the pressure chart.
How often should I check my tyre pressures?
Once a month, and always before a long journey or when loading the car up. Tyres lose air naturally, and a visual glance won't spot a few psi missing. Check them cold, and if one tyre keeps losing pressure faster than the rest, have it inspected — it may have a slow puncture.
Still stuck? Chat with our team — we're happy to help. 🙂

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