Porsche 911 GT3 tyre sizes

Factory tyre sizes for the Porsche 911 GT3 as listed in the maker's official documents. Each of the 1 rows links its source document.

  • Hatchback
  • 2021–2025
  • 1 versions
Rear315/30R21Front255/35R20
21″ / 20″ rim
Rear
315/30R21
Overall diameter
722 mm
Section width
315 mm
Factory wheel: 12Jx21 ET45
Front
255/35R20
Overall diameter
686 mm
Section width
255 mm
Factory wheel: 9.5Jx20 ET46

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

911 GT3 992 2021–2025

VersionFrontRearWheelSource
911 GT3 / GT3 Touring / 911 S/T (20/21" wheel)255/35R20315/30R219.5Jx20 ET46 / 12Jx21 ET45Document ↗US

FAQ

What tyre size does the Porsche 911 GT3 use?

Factory tyre sizes listed in official documents for the Porsche 911 GT3: 255/35R20, 315/30R21. The most common size is 255/35R20.

What wheel size does the Porsche 911 GT3 have?

The Porsche 911 GT3 was sold with 20, 21 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 911 GT3?

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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