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 and S use 235/40ZR18 front and 265/40ZR18 rear on 18-inch standard wheels. The optional 20-inch package uses 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 (235/40ZR18, 265/40ZR18) — 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 (235/40ZR18, 265/40ZR18) — competitive summer alternative at lower cost. Available in Cayman standard staggered sizes. Strong dry and wet grip.
Best tires for the Cayman GT4 and GT4 RS
Michelin Pilot Sport Cup 2 Connect (245/35ZR20, 295/30ZR20) — the factory-specified tire on the GT4 RS. The Cup 2 Connect 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.
Frequently asked
What tire size does the Porsche Cayman use?
718 Cayman (18-inch standard): 235/40ZR18 front, 265/40ZR18 rear. 20-inch option: 235/35ZR20 front, 265/35ZR20 rear. Cayman GT4/GT4 RS: 245/35ZR20 front, 295/30ZR20 rear.
How much do Porsche Cayman tires cost?
235/40ZR18 front: $175 to $280 per tire. 265/40ZR18 rear: $200 to $320 per tire. GT4 staggered 20-inch set installed: $900 to $1,500.
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Last updated 2026-06-27. General guidance only — confirm specifics with a local shop for your exact vehicle.