Porsche 911 Carrera Owner's Manual page 290

Tires, Rims, Tracks 911 Carrera 4, 911 Carrera 4S, 911 Targa 4, 911 Targa 4S
Tire
Summer tires* front 235/40 ZR 18 (91Y)
rear 295/35 ZR 18 (99Y)
or front 235/35 ZR 19 (87Y)
rear 305/30 ZR 19 (102Y) XL
or front 235/35 ZR 19 (87Y)
rear 305/30 ZR 19 (102Y) XL
Snow tires front 235/40 R 18 91V M+S
rear 295/35 R 18 99V M+S**
or
front 235/35 R 19 87V M+S
rear 295/30 R 19 100V XL M+S**
The load capacity coefficient (e.g. "91") and maximum speed code letter (e.g. "Y") are minimum requirements.
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 on the tire + rim combination marked**.
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.
* 911 Carrera 4S, 911 Targa 4S: Summer tires 19-inch only
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Technical Data
Rim Rim offset
8 J x 18 H2 57 mm
11 J x 18 H2 51 mm
8 J x 19 H2 57 mm
11 J x 19 H2 51 mm
8.5 J x 19 H2 55 mm
11.5 J x 19 H2 50 mm
8 J x 18 H2 57 mm
11 J x 18 H2 51 mm
8 J x 19 H2 57 mm
11 J x 19 H2 51 mm
Track
58.6 in./1488 mm
60.9 in./1548 mm
58.6 in./1488 mm
60.9 in./1548 mm
58.6 in./1488 mm
60.9 in./1548 mm
58.6 in./1488 mm
60.9 in./1548 mm
58.6 in./1488 mm
60.9 in./1548 mm