Published by Rims & Tires
Compiled & checked by the site's publisher from manufacturer, NHTSA & USTMA data · Updated 2026-07-24
The Porsche Cayman (718 Cayman) is mechanically similar to the Boxster — mid-engine, flat-four or flat-six, rear-wheel-drive — but in a fixed-roof coupe body that is marginally stiffer. The Cayman GT4 RS uses a naturally-aspirated flat-six directly related to the 911 GT3 engine. Tire selection mirrors the Boxster but GT4 owners should consider more track-focused options.
Porsche Cayman tire sizes
The 718 Cayman base uses 235/45ZR18 front and 265/45ZR18 rear on 18-inch standard wheels; the Cayman S steps up to 235/40ZR19 front and 265/40ZR19 rear as standard. Both offer an optional 20-inch package with 235/35ZR20 front and 265/35ZR20 rear. The Cayman GT4 uses 245/35ZR20 front and 295/30ZR20 rear — a more aggressive stagger. The Cayman GT4 RS uses the same 245/35ZR20 front and 295/30ZR20 rear.
Verify on the door sticker — option packages vary. The GT4 RS staggered sizes limit tire selection to a small pool of ultra-high-performance summer tires.
Best summer tires for the Cayman — standard and S
Michelin Pilot Sport 4S (235/45ZR18, 265/45ZR18; 235/40ZR19, 265/40ZR19): the benchmark summer tire for the Cayman. Factory-specified on many configurations. Outstanding dry grip, steering precision, and progressive limit behavior that complement the Cayman chassis.
Continental ExtremeContact Sport 02 (235/45ZR18, 265/45ZR18; 235/40ZR19, 265/40ZR19): competitive summer alternative at lower cost. Available in Cayman standard staggered sizes. Strong dry and wet grip.
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Best tires for the Cayman GT4 and GT4 RS
Michelin Pilot Sport Cup 2 (245/35ZR20, 295/30ZR20): the factory-specified tire line on the GT4 RS. The Cup 2 is a road-legal, track-optimized compound that delivers exceptional dry grip. Weather-sensitive — not suitable in cold or wet conditions.
Michelin Pilot Sport 4S (245/35ZR20, 295/30ZR20): for GT4 owners who want the best track/street balance. Less outright dry grip than the Cup 2 but significantly better wet performance. Available in GT4 staggered sizes.
Best Tires for the Porsche Cayman at a glance
| Trim | Tire | Best For |
|---|---|---|
| summer tires for the Cayman — standard and S | Michelin Pilot Sport 4S (235/45ZR18, 265/45ZR18; 235/40ZR19, 265/40ZR19) | the benchmark summer tire for the Cayman. Factory-specified on many configurations. Outstanding dry grip, steering precision, and progressive limit behavior that complement the Cayman chassis. |
| summer tires for the Cayman — standard and S | Continental ExtremeContact Sport 02 (235/45ZR18, 265/45ZR18; 235/40ZR19, 265/40ZR19) | competitive summer alternative at lower cost. Available in Cayman standard staggered sizes. Strong dry and wet grip. |
| for the Cayman GT4 and GT4 RS | Michelin Pilot Sport Cup 2 (245/35ZR20, 295/30ZR20) | the factory-specified tire line on the GT4 RS. The Cup 2 is a road-legal, track-optimized compound that delivers exceptional dry grip. Weather-sensitive — not suitable in cold or wet conditions. |
| for the Cayman GT4 and GT4 RS | Michelin Pilot Sport 4S (245/35ZR20, 295/30ZR20) | for GT4 owners who want the best track/street balance. Less outright dry grip than the Cup 2 but significantly better wet performance. Available in GT4 staggered sizes. |
Frequently asked
What tire size does the Porsche Cayman use?
718 Cayman (18-inch standard): 235/45ZR18 front, 265/45ZR18 rear. Cayman S (19-inch standard): 235/40ZR19 front, 265/40ZR19 rear. 20-inch option (both): 235/35ZR20 front, 265/35ZR20 rear. Cayman GT4/GT4 RS: 245/35ZR20 front, 295/30ZR20 rear.
How much do Porsche Cayman tires cost?
235/45ZR18 front: $175 to $280 per tire. 265/45ZR18 rear: $200 to $320 per tire. GT4 staggered 20-inch set installed: $900 to $1,500.
Can I run all-season tires on a Porsche Cayman?
You can, and for a year-round driver in Georgia it is a reasonable choice. A max-performance all-season keeps most of the Cayman's bite while adding cold-weather safety the summer tires give up below about 45 degrees. Purists keep summer rubber for the sharpest feel. If the car sees rain and cool mornings, the all-season trade is easy to justify.
Why can I not rotate the tires on my Cayman?
The Cayman runs a staggered setup, with the rears wider than the fronts, so they physically cannot swap front to back. That means the rears, which do the driving, wear out ahead of the fronts. Plan to replace them as pairs per axle rather than all four on the same schedule, and keep the same tire model at both ends.
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Last updated 2026-07-24. General guidance only — confirm specifics with a local shop for your exact vehicle.