Porsche 911 GT3 Owner's Manual page 239

Tires, Rims, Tracks
Summer tires front
911 GT3 rear
Snow tires front
911 GT3 rear
The load capacity coefficient (e.g. "87") 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 informa-
tion 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.
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.
f Before mounting new tires, check with your
Porsche dealer about the current release status.
238
Technical Data
Tire
235/35 ZR 19 (87Y)
305/30 ZR 19 (102Y) XL
235/35 R 19 87V M+S
295/30 R 19 100V XL M+S*
Rim Rim offset
8.5 J x 19 H2 53 mm
12 J x 19 H2 63 mm
8.5 J x 19 H2 53 mm
11 J x 19 H2 67 mm
Track
58.9 in./1497 mm
60.0 in./1524 mm