NHTSA ID Number: 10198507
Manufacturer Communication Number: 99143-15
TSB/Document Date: 2021-06-28
Summary
Approved Wheels and Tires (03/15) This bulletin rekplaces bulletin Group 4
911 (991)
Technical Information
03/15
ENU
4440
4
Approved Wheels and Tires (03/15)
Revision:
This bulletin replaces bulletin Group 4, #18/13, dated November 22, 2013.
Model Year:
As of 2014 up to 2016
Vehicle Type:
911 GT3 (991)/911 GT3 RS (991)
Approval
status:
March 2015
WARNING
Driving with different tires (mixed tires)
•
Uncontrollable vehicle handling
Only use tires of the same make and type, with the same speed index and the same specification code
(N0, N1, N2, ...) on a vehicle.
WARNING
Driving with sports tires
•
Aquaplaning on wet or muddy roads
Reduce speed.
Drive according to the road conditions.
Summer Tires:
The 911 GT3 and 911 GT3 RS vehicles are fitted as standard with sports tires that were developed
specifically for motor sports.
(FA = front axle, RA = rear axle)
Model
Tire size
Tire make and type
911 GT3
FA: 245/35 ZR 20 (91Y)
RA: 305/30 ZR 20 (103Y) XL
Michelin
Pilot Sport Cup 2 N0
(Inside/Outside)
Dunlop Sport Maxx Race N0
(Inside/Outside)
911 GT3 RS
FA: 265/35 ZR 20 (99Y) XL
RA: 325/30 ZR 21 (108Y) XL
Michelin Pilot Sport Cup 2 N1
(Inside/Outside)
Dunlop XL Sport Maxx Race N0
(Inside/Outside)
2016© Porsche Cars North America, Inc.
AfterSales
Apr 9, 2015
Page 1 of 8
4
911 (991)
4440
ENU
Technical Information
03/15
Information
Sports tires (Ultra High Performance Tires) are permitted on public roads and satisfy all legal
requirements and road safety criteria.
These tires are also designed for use on racing circuits (driving safety training courses, sports driving
schools, Clubsport events) and offer distinct advantages with regard to dry adhesion and wear-and-tear
compared to normal road tires.
The main features are a reduced tread depth as well as a special thread design and substructure.
Winter Tires:
Model
Tire sizes
Tire make and type
911 GT3
FA: 245/35 R 20 91V M+S
RA: 295/30 R 20 97V M+S
Michelin Pilot Alpin 4 N0
(Rotation)
Pirelli Winter 240 Sottozero Series II N0
(Inside/Outside)
911 GT3 RS
FA: 245/35 R 20 91V M+S
RA: 315/35 R 20 110V M+S
Michelin Pilot Alpin 4 N0
(Rotation)
Information
N... = Specification code of the tire, e.g. "N0", "N1", "N2" ... The complete "N ..." code of the tires in
question must be shown on the tire sidewall near the tire type designation.
Instructions for correct mounting of the tires are also given on the tire sidewall. If there are no mounting
instructions on the tire sidewall, the tire must be mounted so that the DOT marking is visible from the
outside.
Arrow with inscription "Rotation"
= directional mounting
“Inside/Outside” inscription or “Left” or “Right”
= mounting on specified side only
Arrow with both inscriptions "Rotation" and
"Inside/Outside"
= directional mounting and mounting on specified
side only
Arrow with both inscriptions “Rotation” and “Left”
or “Right”
= directional mounting and mounting on specified
side only
Information
If a tire is damaged and it is not possible to determine with absolute certainty that there is no ply damage
- with all of its consequences - or if the tire was thermally and/or mechanically overloaded due to a loss of
pressure or other prior damage, replace the tire in question for safety reasons.
Repairs to "V", "W", "Y" and "ZR" tires are not permissable, as well as the use of inner tubes in tubeless
tires. Please inform your customers accordingly. It is advisable to mount winter tires at temperatures
below 45° F/7°C , because the driving characteristics of summer tires are reduced at low temperatures.
Extremely low temperatures can cause permanent damage to summer tires.
Apr 9, 2015
Page 2 of 8
AfterSales
2016© Porsche Cars North America, Inc.
911 (991)
Technical Information
03/15
ENU
4440
4
WARNING
Incorrect tire pressure
•
Uncontrollable vehicle handling
Adjust the tire pressure according to specifications. Never allow the pressure to fall below the minimum
pressure.
Check age of tires. Replace tires that are more than 6 years old.
Perform visual inspections.
Use only tires recommended by Porsche.
Tire Pressure:
Information
The tire pressure applies only to the tire makes and types approved by Porsche, and is specified for cold
tires (approx. 68° F/20°C ). The tire pressures must never be lower than the specified values.
Standard tire pressure for summer tires
FA
RA
2.0 bar
(29 psi)
2.3 bar
(33 psi)
911 GT3
20-inch wheels
19-inch spare wheel
3.5 bar (50 psi)
911 GT3 RS
FA: 20-inch wheels
RA: 21-inch wheels
2.0 bar
(29 psi)
2.3 bar
(33 psi)
FA
RA
2.2 bar
(32 psi)
2.4 bar
(35 psi)
2.3 bar
(33 psi)
2.5 bar
(36 psi)
Standard tire pressure for winter tires
911 GT3
20-inch wheels
911 GT3 RS
20-inch wheels
Sizes:
Permissible wheel and tire sizes
(RO = rim offset in mm, FA = front axle, RA = rear axle)
2016© Porsche Cars North America, Inc.
AfterSales
Apr 9, 2015
Page 3 of 8
4
911 (991)
4440
ENU
Technical Information
03/15
Snow
chains
Tire sizes
Wheel sizes
Summer
FA: 245/35 ZR 20 (91Y)
RA: 305/30 ZR 20 (103Y) XL
FA: 9 J x 20 H2, RO 55
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TSB/Document ID: 99143-15
Replacement Service Bulletin Number:
MFR Communication Date: 2015-04-09
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: TIRES
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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