Porsche Cayman tire and wheel sizes
The Porsche Cayman was approved in Switzerland between 2005 and 2023 with tires from 205/55R17 to 265/35R20 on 17″, 18″, 19″, 20″ wheels. The most common sizes are 235/35R20, 245/35R20, 275/30R20. Some versions use different sizes front and rear (staggered fitment).
Sizes differ by engine, trim and market. Confirm with the tire placard (usually on the driver's door jamb), the owner's manual or the vehicle registration papers before buying tires or wheels.
Most common sizes
Porsche Cayman GT4 (2019–2023) type 982
5 approved versions, e.g. Cayman GT4.
Porsche Cayman GT4 RS (2022–2023) type 982G
5 approved versions, e.g. Cayman GT4 RS.
Porsche Cayman (2013–2016) type 981
15 approved versions, e.g. Cayman, Cayman S, Cayman GTS, Cayman GT4.
| Tire size | Axle | Load / speed | Rim and offset | Versions |
|---|---|---|---|---|
| 235/45R18 | Front | 94Y | 8Jx18 ET57 | 5 |
| 265/45R18 | Rear | 101Y | 9Jx18 ET47 | 5 |
| 235/40R19 | Front | 92Y | 8Jx19 ET57 | 12 |
| 265/40R19 | Rear | 98Y | 9.5Jx19 ET45 | 12 |
| 235/35R20 | Front | 88Y | 8Jx20 ET57, 8.5Jx20 ET57 | 15 |
| 245/35R20 | Front | 91Y | 8.5Jx20 ET61 | 3 |
| 265/35R20 | Rear | 95Y | 9.5Jx20 ET45, 10Jx20 ET50 | 12 |
| 275/30R20 | Rear | 97V | 10Jx20 ET50 | 3 |
| 295/30R20 | Rear | 101Y | 11Jx20 ET50 | 3 |
Porsche Cayman (2005–2011) type 987
7 approved versions, e.g. Cayman S, Cayman, Cayman R, Cayman S BlackEd.
| Tire size | Axle | Load / speed | Rim and offset | Versions |
|---|---|---|---|---|
| 205/55R17 | Front | 91Y | 6.5Jx17 ET55, 7Jx17 ET55 | 2 |
| 235/50R17 | Rear | 96Y | 8Jx17 ET40, 8.5Jx17 ET40 | 2 |
| 235/40R18 | Front | 91Y | 8Jx18 ET57 | 6 |
| 265/40R18 | Rear | 101Y | 9Jx18 ET43 | 6 |
| 265/35R19 | Front & rear | 94Y | 9.5Jx19 ET46, 10Jx19 ET42 | 1 |
| 235/35R19 | Front | 87Y | 8Jx19 ET57, 8.5Jx19 ET55 | 7 |
| 265/35R19 | Rear | 94Y | 9.5Jx19 ET46, 10Jx19 ET42 | 6 |
How to read this table
Rim and offset uses the European notation: 7Jx17 ET45 is a 7-inch wide, 17-inch diameter wheel with a 45 mm offset. "Versions" is how many approved versions list that size — a rough guide to how common it is. Load / speed is the most frequent service description (for example 91V) among them; your car may require a higher one.
Showing 32 of 32 approvals: rare special versions are left out to keep the page readable. Records were read from the German-language text and checked against the French text; 78 % matched exactly.
Source: Swiss Federal Roads Office (FEDRO/ASTRA), open government data. Original data (downloaded 2026-09-29). Data processed by us; errors in processing are ours, not the publisher's.