NHTSA ID Number: 11028374
Manufacturer Communication Number: No. 52-25
TSB/Document Date: 2026-02-05
Summary
Manufacturers certificate for approved wheels and tires on the 911 GT3, 911 R, 911 GT3 RS
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TSB/Document ID: No. 52-25
Replacement Service Bulletin Number:
MFR Communication Date: 2026-01-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: WHEELS
MFR Component System:
MFR Component Subsystem:
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911 (991)
Manufacturer's Certificate
52/25
ENU
4400
4
Approved: Wheels and Tires (52/25)
Revision:
This bulletin replaces bulletin Group 4 49/24, dated May 8, 2025.
Model Year:
As of 2014 up to 2016
Vehicle Type:
911 GT3 (991) / 911 R (991) / 911 GT3 RS (991)
Approval Status: November 2025
WARNING
Driving with different tires (mixed tires)
•
Uncontrollable vehicle handling
Þ
⇒
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
Þ
⇒
Reduce speed.
Þ
⇒
Drive according to the road conditions.
Summer Tires:
The 911 GT3, 911 R 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/
Label value (Link to EU database)
911 GT3, 911 R
FA: 245/35 ZR 20 (95Y) XL
RA: 305/30 ZR 20 (103Y)
XL
Michelin
Pilot Sport Cup 2 N1
(Inside/Outside)
UHP tires
FA: https://eprel.ec.europa.eu/qr/411697
RA: https://eprel.ec.europa.eu/qr/413161
Michelin Pilot Sport 4S N0
(Inside/Outside)
AfterSales
Jan 5, 2026
Page 1 of 9
4
911 (991)
4400
ENU
Manufacturer's Certificate
52/25
Model
Tire size
Tire make and type/
Label value (Link to EU database)
FA: https://eprel.ec.europa.eu/qr/411317
RA: https://eprel.ec.europa.eu/qr/408604
only for 911 GT3
Dunlop Sport Maxx Race 2 N2
(Inside/Outside)
FA: https://eprel.ec.europa.eu/qr/529754
RA: https://eprel.ec.europa.eu/qr/529745
911 GT3 RS
FA: 265/35 ZR 20 (99Y) XL
RA: 325/30 ZR 21 (108Y)
XL
Michelin Pilot Sport Cup 2 N2
(Inside/Outside)
UHP tires
FA: https://eprel.ec.europa.eu/qr/411773
RA: https://eprel.ec.europa.eu/qr/408335
Dunlop Sport Maxx Race 2 N1
(Inside/Outside)
UHP tires
FA: https://eprel.ec.europa.eu/qr/529768
RA: https://eprel.ec.europa.eu/qr/529767
Michelin Pilot Sport Cup 2 R N0
(Inside/Outside)
FA: https://eprel.ec.europa.eu/qr/411795
RA: https://eprel.ec.europa.eu/qr/409802
Goodyear Eagle F1 Super Sport RS N0
FA: https://eprel.ec.europa.eu/qr/1576159
RA: https://eprel.ec.europa.eu/qr/530039
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.
Jan 5, 2026
Page 2 of 9
AfterSales
911 (991)
Manufacturer's Certificate
Winter Tires:
52/25
ENU
4400
Model
Tire sizes
Tire make and type/
Label value (Link to EU database)
911 GT3, 911 R
FA: 245/35 R 20 91V M+S
RA: 295/30 R 20 97V M+S
Michelin Pilot Alpin 4 N1
(Rotation)
4
FA: https://eprel.ec.europa.eu/qr/412844
RA: Data currently not available
Pirelli Winter 240 Sottozero Series II N1
(rotation)
FA: https://eprel.ec.europa.eu/qr/594297
RA: https://eprel.ec.europa.eu/qr/594293
FA: 245/35 R 20 91V M+S
RA: 295/30 R 20 101V XL
M+S
only for 911 GT3
911 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)
FA: https://eprel.ec.europa.eu/qr/412844
RA: https://eprel.ec.europa.eu/qr/411498
Michelin Pilot Alpin 4 N1
(rotation)
FA: https://eprel.ec.europa.eu/qr/412844
RA: https://eprel.ec.europa.eu/qr/409024
Information
In principle, only tires that at least correspond to the maximum vehicle speed may be installed on the vehicle.
There may be national exemptions for winter tires marked for M+S and 3PMSF (3 peak mountain snow flake),
which also permit tires that do not correspond to the maximum vehicle speed.
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
AfterSales
Jan 5, 2026
Page 3 of 9
4
911 (991)
4400
ENU
Manufacturer's Certificate
52/25
Arrow with both inscriptions “Rotation” and
“Inside/Outside”
= Directional mounting on specified side only
Arrow with both inscriptions “Rotation” and “Left” or
“Right”
= Directional mounting on specified side only
Information
As a general rule, Porsche does not recommend having tires repaired. Local legislation must always be
observed.
It is advisable to install winter tires for temperatures below 7 °C (44 °F), because the driving characteristics
of summer tires and UHP tires are reduced at low temperatures. Subfreezing temperatures can cause
permanent damage to summer tires and UHP tires.
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 this value is exceeded, we recommend that you replace both tires.
WARNING
Incorrect tire pressure
•
Uncontrollable vehicle handling
Þ
⇒
Adjust the tire pressure according to specifications. Never allow the pressure to fall below the minimum pressure.
Þ
⇒
Check age of tires. Recommendation: Replace tires that are more than 6 years old.
Þ
⇒
Perform visual inspections.
Þ
⇒
Use only tires approved 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. 20 °C/ 68 °F). The tire pressure must not be lower than the specified values.
Standard tire pressure for summer tires
Wheel size
FA
RA
2.0 bar
(29 psi)
2.3 bar
(33 psi)
2.0 bar
(29 psi)
2.3 bar
(33 psi)
911 GT3, 911 R
20-inch wheels
911 GT3 RS
FA 20–inch wheels
RA 21–inch wheels
Jan 5, 2026
Page 4 of 9
AfterSales
911 (991)
Manufacturer's Certificate
52/25
ENU
4400
4
Standard tire pressure for winter tires
Wheel size
FA
RA
2.2 bar
(32 psi)
2.4 bar
(35 psi)
2.3 bar
(33 psi)
2.5 bar
(36 psi)
911 GT3, 911 R
20-inch wheels
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