Porsche Cayman Owner's Manual page 300

Tires, Rims, Tracks
Cayman S
Summer tires front
rear
or
front
rear
Snow tires
front
rear
The load capacity coefficient (e.g. "91") and maximum speed code letter (e.g. "V") are minimum requirements.
Danger!
Installation of sizes not authorized by Porsche may have a dangerous effect on the driving stability and could result in severe personal injury or
death.
Before mounting new tires, check with your Porsche dealer about the current release status.
Tire and rim sizes Extensive tests are performed before specific tires and wheels are approved by Porsche. Your Porsche dealer has information
about approved tires and wheels and is happy to assist you. If aftermarket tires and/or wheels are installed which are not approved
by Porsche, the vehicle's driveability, stability while in motion and handling characteristics might be impaired. Since Porsche has
no data on such combinations, Porsche cannot stand behind the safety or durability of these aftermarket combinations.
Snow chains * Can be mounted only on the rear wheels; maximum speed 30 mph/50 km/h. Use only Porsche authorized fine-link cross-type
or edge chains. Snow chain clearance can be guaranteed only with the tire + rim combination marked.
298
Vehicle Identification, Technical Data
Tire
235/40 ZR 18 (91Y)
265/40 ZR 18 (101Y) XL
235/35 ZR 19 (87Y)
265/35 ZR 19 (94Y)
235/40 R 18 91V M+S
255/40 R 18 95V M+S *
Please observe the chapter "TIRES/WHEELS" on page 237.
Rim Rim offset
8 J x 18 H2 57 mm
9 J x 18 H2 43 mm
8 J x 19 H2 57 mm
9.5 J x 19 H2 46 mm
8 J x 18 H2 57 mm
9 J x 18 H2 43 mm
Track
58.5 in./1486 mm
60.2 in./1528 mm
58.5 in./1486 mm
60.0 in./1522 mm
58.5 in./1486 mm
60.2 in./1528 mm