Porsche 718 Boxster / Cayman tyre sizes

Factory tyre sizes for the Porsche 718 Boxster / Cayman as listed in the maker's official documents. Each of the 4 rows links its source document.

  • Hatchback
  • 2017–2021
  • 4 versions
Rear265/45R18Front235/45R18
18″ rim
Rear
265/45R18
Overall diameter
696 mm
Section width
265 mm
Factory wheel: 9.5Jx18 ET49
Front
235/45R18
Overall diameter
669 mm
Section width
235 mm
Factory wheel: 8Jx18 ET57
19″ rim
Rear
265/40R19
Overall diameter
695 mm
Section width
265 mm
Factory wheel: 10Jx19 ET45
Front
235/40R19
Overall diameter
671 mm
Section width
235 mm
Factory wheel: 8Jx19 ET57
20″ rim
Rear
265/35R20
Overall diameter
694 mm
Section width
265 mm
Factory wheel: 10Jx20 ET45
Front
235/35R20
Overall diameter
672 mm
Section width
235 mm
Factory wheel: 8Jx20 ET57

The tyres on the car may have been changed. For the exact size, check the label in the door frame or the registration.

Change the size, press the gas: see the difference →

Some rows come from an official document of another country (US). Your market's version may differ; compare with the door label.

Tyres and wheels by version

718 Boxster / Cayman 982 2017–2021

VersionFrontRearWheelSource
718 Boxster / Boxster S / Cayman / Cayman S (18" wheel)235/45R18265/45R188Jx18 ET57 / 9.5Jx18 ET49Document ↗US
718 Boxster / Boxster S / Cayman / Cayman S (19" wheel)235/40R19265/40R198Jx19 ET57 / 10Jx19 ET45Document ↗US
718 Boxster / S / GTS / GTS 4.0 / T / Cayman / S / GTS / GTS 4.0 / T (20" wheel 8J/10J)235/35R20265/35R208Jx20 ET57 / 10Jx20 ET45Document ↗US
718 Boxster / S / GTS / GTS 4.0 / T / Cayman / S / GTS / GTS 4.0 / T (20" wheel 8.5J/10.5J)235/35R20265/35R208.5Jx20 ET57 / 10.5Jx20 ET47Document ↗US

FAQ

What tyre size does the Porsche 718 Boxster / Cayman use?

Factory tyre sizes listed in official documents for the Porsche 718 Boxster / Cayman: 235/45R18, 265/45R18, 235/40R19, 265/40R19, 235/35R20, 265/35R20. The most common size is 235/35R20.

What wheel size does the Porsche 718 Boxster / Cayman have?

The Porsche 718 Boxster / Cayman was sold with 18, 19, 20 inch wheels in the sourced versions. The number after R on your tyre's sidewall tells you which one you have.

Can I fit a different tyre size on the Porsche 718 Boxster / Cayman?

A size whose overall diameter is within 3% of the factory size, with no lower load index or speed rating, usually fits. For final approval check the door label, CoC and your tyre shop.

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