122-A6Z6M-09

911 (991)
Technical Information
10/19
ENU
4400
4
Approved Wheels and Tires (10/19)
Revision:
This bulletin replaces bulletin, Group 4, #20/18, dated November 19, 2018.
Model Year:
As of 2018 up to 2019
Vehicle Type:
911 GT2 RS (991 II)/GT3 RS (991 II)/GT Speedster
Approval
Status:
July, 2019
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. Exception: A mixed installation is permitted for the winter tires Michelin Pilot Alpin 4 N1/N0.
WARNING
Driving with sports tires
•
Aquaplaning on wet or muddy roads

Reduce speed.

Drive according to the road conditions.
Summer Tires:
The 911 GT2 RS/GT3 RS vehicles have sports tires that were developed specifically for motor sports.
(FA = front axle, RA = rear axle)
Model
Tire size
Tire make and type
911 GT2 RS/GT3 RS
FA: 265/35 ZR 20 (99Y) XL
RA: 325/30 ZR 21 (108Y) XL
Michelin Pilot Sport Cup 2 N2
(Inside/Outside)
Michelin Pilot Sport Cup 2 R N0
(Inside/Outside)
Dunlop Sport Maxx Race 2 N1
(Inside/Outside)
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Technical Information
10/19
Model
Tire size
Tire make and type
911
GT3/Touring/GT
Speedster
FA: 245/35 ZR 20 (95Y) XL
RA: 305/30 ZR 20 (103Y) XL
Michelin Pilot Sport Cup 2 N1
(Inside/Outside)
Michelin Pilot Sport 4S N0
(Inside/Outside)
Dunlop Sport Maxx Race 2 N1
(Inside/Outside)
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 GT2 RS/GT3 RS
FA: 245/35 R 20 91V M+S
RA: 315/35 R 20 110V XL M+S
Michelin Pilot Alpin 4 N1
(Rotation)
911
GT3/Touring/GT
Speedster
FA: 245/35 R 20 91V M+S
RA: 295/30 R 20 97V/101V XL
M+S
Michelin Pilot Alpin 4 N1
(Rotation)
Pirelli Winter 240 Sottozero Series II N0
(Rotation)
Information
"N..." = Specification code of the tyre, e.g. "N0", "N1", "N2" ... The complete “N ...” code of the tyres in
question must be shown on the tyre sidewall near the tyre type designation.
Instructions for correct mounting of the tyres are also given on the tyre sidewall. If there are no mounting
instructions on the tyre sidewall, the tyre must be mounted so that the DOT marking is visible from the
outside.
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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
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911 (991)
Technical Information
10/19
ENU
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4
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.
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
911 GT2 RS
Standard tire pressure
Front axle
Rear axle
Performance tire pressure
Front axle
20-inch summer
tires
2.4 bar
(35 psi)
2.0 bar
(29 psi)
20-inch summer
tires Cup 2R
2.5 bar
(36 psi)
2.2 bar
(32 psi)
Rear axle
21-inch summer
tires
2.7 bar
(39 psi)
2.3 bar
(33 psi)
21-inch summer
tires Cup 2R
2.8 bar
(41 psi)
2.5 bar
(36 psi)
20-inch
winter/allseason tires
2.3 bar
(33 psi)
2.5 bar
(36 psi)
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2.3 bar
(33 psi)
2.5 bar
(36 psi)
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Technical Information
10/19
Standard tire pressure
911 GT3 RS
Front axle
20-inch summer tires
2.0 bar
(29 psi)
20-inch summer tires
Cup 2R
2.2 bar
(32 psi)
21-inch summer tires
2.3 bar
(33 psi)
21-inch summer tires
Cup 2R
2.5 bar
(36 psi)
20-inch winter/all-season
tires
Sizes:
Rear axle
2.3 bar
(33 psi)
2.5 bar
(36 psi)
Permissible wheel and tire sizes
(RO = rim offset in mm, FA = front axle, RA = rear axle)
Tires
Tire sizes
Wheel sizes
Snow
chains
911 GT2 RS/GT3 RS
Summer
FA: 265/35 ZR 20 99 XL Y
RA: 325/30 ZR 21 108 XL Y
FA: 9.5 J x 20 H2, RO 50
RA: 12.5 J x 21 H2, RO 48
Winter
FA: 245/35 R 20 91 V M+S
RA: 315/35 R 20 110 XL V M+S
FA: 9J x 20 H2, RO 55
RA: 12J x 20 H2, RO 47
No
RA only
911 GT3/Touring/GT Speedster
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Summer
FA: 245/35 ZR 20 95 XL Y
RA: 305/30 ZR 20 103 XL Y
FA: 9 J x 20, RO 55
RA: 12J x 20, RO 47
No
Winter
FA: 245/35 R 20 91 V M+S
RA: 295/30 R 20 97V/101 XL V M+S
FA: 9 J x 20, RO 51
RA: 11J x 20, RO 59
RA only
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911 (991)
Technical Information
Wheels:
10/19
ENU
4400
4
Overview of Porsche wheels for summer and winter tires
Identification on the inside/outside of the wheel disc:
Wheel size, rim offset (RO) in mm, Part No. (FFF = color code) and Porsche logo
911 GT2 RS
20, 21-inch GT2RS aluminum wheel with
central lock
FA: 9.5 J x 20 H2, RO 50
Part No. 991.362.162.83 FFF
RA: 12.5 J x 21 H2, RO 48
Part No. 991.362.167.84 FFF
20, 21-inch GT2RS aluminum wheel
20, 21-inch GT2RS magnesium wheel with
central lock
FA: 9.5 J x 20 H2, RO 50
Part No. 991.362.163.83 FFF
RA: 12.5 J x 21 H2, RO 48
Part No. 991.362.168.84 FFF
20, 21-inch GT2RS magnesium wheel
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Technical Information
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911 GT3 RS
20, 21-inch GT3RS aluminum wheel with
central lock
FA: 9.5 J x 20 H2, RO 50
Part No. 991.362.162.84 FFF
RA: 12.5 J x 21 H2, RO 48
Part No. 991.362.167.85 FFF
20, 21-inch GT3RS aluminium wheel
20, 21-inch GT3RS magnesium wheel with
central lock
FA: 9.5 J x 20 H2, RO 50
Part No. 991.362.163.83 FFF
RA: 12.5 J x 21 H2, RO 48
Part No. 991.362.168.84 FFF
20, 21-inch GT3RS magnesium wheel
Information
Improper handling can damage the wheel surface.
Carry out tire removal and mounting using a bead holding-down device only.
Use a leather pad on the rim flange to support the valve insertion tool.
Only use the Porsche centering clamping set for balancing.
Do not use brushes to clean the wheels because brushes can cause deep scratches that cannot be
removed by polishing.
Never use solvents or other chemical substances on tires.
Wheel
Mounting:
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using central wheel lock:
Tightening torque 600 Nm (444 ftlb.)
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911 (991)
Technical Information
10/19
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WARNING
Incorrectly installed snow chains
•
Uncontrollable vehicle handling

Do not exceed the maximum speed of Speed 30 mph/50 km/h.

Observe installation instructions from the chain manufacturer.
Snow Chains:
Porsche offers the following snow chains as accessories:
Tire size
Porsche Part No.
Type of snow chain
991.044.601.00
Link-type chain, quick fit
911 GT2 RS/GT3 RS
315/35 R 20 M+S
Wheel Storage: Tires must be stored in a cool, dry and dark room with adequate ventilation. Tires must never come into
contact with fuel, oil, grease or chemicals. Do not store summer tires in storage areas with ambient
temperatures of less than 5° F (-15° C).
Complete wheels can be stacked for storage; we recommend that you increase the tire pressure by
approx. 6 psi (0.4 bar).
Optimum conditions for storage of the complete wheels are provided by the Original Porsche storage
trolley, Part No. 000.044.000.38.
If the tires are not mounted on wheels, it is best to store them in a vertical position. We recommend that
you turn tires stored in this position every two weeks in order to prevent flat spots. Tires that are stacked
in a horizontal position will become severely deformed and cannot be seated properly in the rim flange
when they are mounted.
General
Information:
Always use new valves when changing tires.
Always observe any possible instructions concerning the rolling direction and/or specifying which side
the tires must be mounted on. Refer to notes on page 1 (if applicable).
Coat the tire beads and humps with mounting lubricant before mounting the tire. This ensures that the
tire beads will slide over the humps easily. In order to prevent the tire from turning on the wheel, avoid
extreme driving maneuvers (acceleration and braking) during the first 100 to 200 miles with new or
recently mounted tires.
In order to optimize smoothness of rolling, it is appropriate - and necessary in individual cases - to mount
the tire in a certain (favorable) position with respect to the wheel (matching).
Matching (uncontrolled and controlled) is explained below:
Uncontrolled matching: Turning the tire on the wheel by 90° or 120° if necessary in order to achieve an
acceptable value with regard to rolling smoothness (true running, imbalance and weight distribution of
balance weights).
Controlled matching: With a balancing machine with matching program. In most cases, this produces an
even better result with regard to the rolling smoothness (true running, imbalance and weight distribution
of the balance weights) than can be achieved with uncontrolled matching. Maximum permissible radial
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Technical Information
10/19
runout and lateral runout of the wheels < 0.7 mm. Maximum permissible radial runout and lateral runout
of the wheels with tires < 1.25 mm. Values < 1.50 mm - ideally approx. 0.5 mm - are desirable.
The mounting pressure (seating pressure) of 58 psi/4.0 bar overpressure must not be exceeded before
both tire beads are evenly seated on the rim flange.
If new tires are to be mounted or the tires of one axle are to be replaced, tires of the same make, the
same type and with the same specification code must always be used on each of the two axles. If tires
are replaced on one axle only, the different tread depth from that on the other axle can cause a noticeable
change in the familiar handling. This is especially the case if new tires are mounted on the rear axle. This
effect decreases with increasing tire mileage.
When replacing a tire on an axle, make sure that the tread depth of the new tire does not differ from that of
the other tire by more than 30 %.
If a tire is damaged and it cannot be determined with absolute certainty that there is no ply damage - with
all of its consequences - or if the tire was thermally or mechanically overloaded due to a loss of pressure
or other prior damage, we recommend replacement of the tire in question for safety reasons.
Repairs on “ZR” tires are not permissible, as is the use of inner tubes in tubeless tires. Tires age due
to chemical and physical processes, which can impair their function. Tires that are stored unused for
an extended period harden and become brittle faster than tires that are in continual use. Hairline aging
cracks can occur on older tires. On tires in continual use, the kneading action activates the plasticizer in
the rubber and thereby prevents hardening and cracking.
Therefore, attention should be paid not only to the tread depth but also to the age of the tire. Tires should
not be older than 6 years. The age of the tire can be determined via the DOT code on the sidewall, which
indicates the production date of the tire: e.g. DOT 2201= 22nd week of 2001.
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. Part numbers listed in these bulletins are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a
discrepancy, the work procedures in the PIWIS Tester are the ones that must be followed.
© 2019 Porsche Cars North America, Inc.
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