NHTSA ID Number: 10199877
Manufacturer Communication Number: No. 73-20
TSB/Document Date: 2021-08-04
Summary
List of approved wheels, tires, and spacers for the 928 model, from Model Years 1978 to 1995.
Freigabe/Approval
Manufacturer's Certificate
73/20
ENU
4440
4
Approved Tires, Wheels and Spacers (73/20)
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.
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.
Vehicle Types
928, 928 S, 928 S4, 928 Club Sport, 928 GT, 928 GTS
Model Year:
As of 1978 up to 1995
Information:
Approved tires
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.
Makes/Types:
Summer tire approvals
Tire size
Tire make and type
Comments /
Label value (link to EU database)
AfterSales
Jul 30, 2021
Page 1 of 14
4
Freigabe/Approval
4440
ENU
Manufacturer's Certificate
73/20
Pirelli P Zero Asimmetrico
N3
Pirelli P Zero Rosso
Asimmetrico N5
Continental ContiSportContact N2
225/50 ZR16 (FA,
RA)
Michelin Pilot Exalto 2 N0
Pirelli P-Zero Trofeo R
N0 (UHP tires)
Pirelli P7 Cinturato N4
928 mod. 78 — 82
928 S mod 80 — 86
FA/RA: Label values currently not available
928 mod. 78 — 82
928 S mod 80 — 86
FA/RA:
https://eprel.ec.europa.eu/qr/596144
928 mod. 78 — 82
928 S mod 80 — 86
FA/RA: Label values currently not available
928 mod. 78 — 82
928 S mod 80 — 86
FA/RA:
https://eprel.ec.europa.eu/qr/412732
928 mod. 78 — 82
928 S mod 80 — 86
FA / RA:
https://eprel.ec.europa.eu/qr/621931
928 mod. 78 — 82
928 S mod 80 — 86
FA/RA: Label values currently not available
Continental ContiSportContact N2
928 S4
928 CS
928 GT 89
FA/RA: Label values currently not available
225/50 ZR16 (FA)
Pirelli P Zero Rosso
Asimmetrico N5
245/45 ZR16 (RA)
928 S4
928 CS
928 GT 89
FA: https://eprel.ec.europa.eu/qr/596144
RA: https://eprel.ec.europa.eu/qr/596143
Pirelli P-Zero Trofeo R
N0 (UHP tires)
928 S4
928 CS
928 GT 89
FA: https://eprel.ec.europa.eu/qr/621931
RA: https://eprel.ec.europa.eu/qr/621932
Jul 30, 2021
Page 2 of 14
AfterSales
Freigabe/Approval
Manufacturer's Certificate
73/20
Pirelli P7 Cinturato N4
ENU
4440
4
928 S4
928 CS
928 GT 89
FA/RA: Label values currently not available
Michelin Pilot Sport 2 N3
928 S4
928 CS
928 GT 89
928 GTS
FA: https://eprel.ec.europa.eu/qr/412319
RA: https://eprel.ec.europa.eu/qr/412056
225/45 ZR17 (FA)
255/40 ZR17 (RA)
Pirelli P Zero Rosso
Asimmetrico N5
928 S4
928 CS
928 GT 89
928 GTS
FA: https://eprel.ec.europa.eu/qr/596141
RA: https://eprel.ec.europa.eu/qr/596140
Pirelli P-Zero Trofeo R
N0 (UHP tires)
928 S4
928 CS
928 GT 89
928 GTS
FA: https://eprel.ec.europa.eu/qr/621933
RA: https://eprel.ec.europa.eu/qr/621934
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.
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.
AfterSales
Jul 30, 2021
Page 3 of 14
4
Freigabe/Approval
4440
ENU
Manufacturer's Certificate
73/20
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 new rubber valves at every tire change.
Use only tires approved by Porsche.
Tire pressure:
16-inch wheels
17-inch wheels
Front axle
2.5 bar (36 psi)
2.5 bar (36 psi)
Rear axle
3.0 bar (44 psi)
2.5 bar (36 psi)
Wheel
Mounting:
The tightening torque for securing wheels and spacers is 130 Nm (96 ftlb.).
Sizes:
Permissible summer tire and wheel sizes (RO = rim offset in mm)
Tires
Notes
225/50 ZR16 (FA, RA)
7Jx16, RO 65
928 mod. 78 — 82
928 S mod 80 — 86
225/50 ZR16 (FA)
7Jx16, RO 65 (FA)
245/45 ZR16 (RA)
8J x 16, RO 52.3 (RA)
225/45 ZR17 (FA)
7.5Jx17, RO 65 (FA)
255/40 ZR17 (RA)
9J x 17, RO 55 (RA)
928 S4, 928 CS, 928 GT 89
928 S4, 928 CS, 928 GT
89, 928 GTS
Further detailed information about permitted wheel and tire sizes as well as spacers that may be required
can be found in the relevant parts certificates/manufacturer’s certificates held by the Porsche partners.
Jul 30, 2021
Page 4 of 14
AfterSales
Freigabe/Approval
Manufacturer's Certificate
73/20
Makes/types:
ENU
4440
4
Winter tire approval
Tire size
215/60 R15
90T M+S (FA,
RA)
215/60 R15
93T M+S (FA,
RA)
Tire make
and type
Continental
TS 740
Goodyear Ultra
Grip 3
Semperit Top
Grip
Bridgestone
WT 04
205/55 R16
88T M+S (FA,
RA)
Continental
TS 740
Pirelli Winter
190
225/55 R16
92T M+S (FA,
RA)
Pirelli Winter
190
205/55 R16
94V M+S (FA,
RA)
Pirelli W240
Sottozero
Standard II N2
Snow chain
clearance
(only without
spacers)
Comments /
Label value (link to EU database)
928, 928 S, 928 S4
Area of application: Frequent highway trips
Yes
Universal bar
chain, quick
assembly
Part No.: 911
.361.909.00
FA/RA: Label values currently not available
928, 928 S, 928 S4
Area of application: Frequent highway trips
FA/RA: Label values currently not available
928, 928 S, 928 S4
Area of application: Frequent highway trips
FA/RA: Label values currently not available
928, 928 S, 928 S4
Area of application: For all conditions
Yes
Universal bar
chain, quick
assembly
Part No.: 911
.361.909.00
FA/RA: Label values currently not available
928, 928 S, 928 S4
Area of application: Frequent highway trips
FA/RA: Label values currently not available
928, 928 S, 928 S4
Area of application: Frequent highway trips
FA/RA: Label values currently not available
Yes
Universal bar
chain, quick
assembly
Part No.: 911
.361.909.00
Nosnow-chain
clearance on
8Jx16 wheels
Yes
AfterSales
928, 928 S, 928 S4
Area of application: For all conditions
FA/RA: Label values currently not available
928, 928 S, 928 S4, 928 CS
Up to model year 1988
FA/RA:
https://eprel.ec.europa.eu/qr/596139
Jul 30, 2021
Page 5 of 14
4
Freigabe/Approval
4440
ENU
Manufacturer's Certificate
73/20
225/50 R16
96V M+S (FA,
RA)
225/45 R17
94V M+S (FA,
RA)
225/45 R17
94V M+S (FA)
255/40 R17
98V M+S (RA)
205/55 R16
94V M+S (FA)
225/50 R16
96V M+S (RA)
225/45 R17
94V M+S (FA,
RA)
225/45 R17
94V M+S (FA)
255/40 R17
98V M+S (RA)
225/45 R17
94V M+S (FA,
RA)
225/45 R17
94V M+S (FA)
255/40 R17
98V M+S (RA)
Pirelli W240
Sottozero
Standard II N2
Pirelli Winter
Sottozero 3 N2
Pirelli Winter
Sottozero 3 N2
Yes
Yes
No
928, 928 S, 928 S4, 928 CS
Up to model year 1988
FA/RA:
https://eprel.ec.europa.eu/qr/596138
928, 928 S, 928 S4, 928 CS
Up to model year 1988
FA / RA:
https://eprel.ec.europa.eu/qr/595708
928, 928 S, 928 S4, 928 CS
Up to model year 1988
FA: https://eprel.ec.europa.eu/qr/595708
RA: https://eprel.ec.europa.eu/qr/595709
Pirelli W240
Sottozero
Standard II N2
Pirelli Winter
Sottozero 3 N2
Pirelli Winter
Sottozero 3 N2
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TSB/Document ID: No. 73-20
Replacement Service Bulletin Number:
MFR Communication Date: 2021-07-30
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: TIRES
MFR Component System:
MFR Component Subsystem:
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