No. 76-20

Freigabe/Approval
Manufacturer's Certificate
76/20
ENU
4440
4
Approved Tires, Wheels and Spacers (76/20)
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
911 (911), 912 (911), 911 Turbo (930)
Model Year:
As of 1965 up to 1989
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.
AfterSales
Jul 30, 2021
Page 1 of 14
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Freigabe/Approval
4440
ENU
Manufacturer's Certificate
76/20
Makes/Types:
Summer tire approvals
Tire size
Tire make and type
Comments /
Label value (link to EU database)
911 mod. 65 — 67
912 mod. 66 — 68
165 VR 15 (FA, RA)
Pirelli CN36 N5
If the wheels used require the use of a
tube, we recommend the Michelin 15 E
13 tube. The tire can also be used without
a tube on all other wheels.
FA/RA: Label values currently not available
911 mod. 65 — 67
185/70 R15 89W (FA, RA)
Pirelli P 6000 N3
912 mod. 66 — 68
FA / RA:
https://eprel.ec.europa.eu/qr/596148
911 mod. 65 — 67
185/70 VR 15 (FA, RA)
Pirelli CN36 N5
912 mod. 66 — 68
FA/RA: Label values currently not available
911 mod. 65 — 67
185/70 R15 89W (FA)
215/60 R15 94W (RA)
185/70 VR 15 (FA)
215/60 VR 15 (RA)
Pirelli P 6000 N3
912 mod. 66 — 68
FA: https://eprel.ec.europa.eu/qr/596148
RA: https://eprel.ec.europa.eu/qr/596146
911 mod. 65 — 67
Pirelli CN36 N5
912 mod. 66 — 68
FA/RA: Label values currently not available
911 mod. 65 — 67
185/70 R15 89 V (FA)
215/60 R15 94V (RA)
Dunlop Sport Classic
N0
912 mod. 66 — 68
FA: https://eprel.ec.europa.eu/qr/531071
RA: https://eprel.ec.europa.eu/qr/531072
911 mod. 65 — 67
195/65 R15 91W (FA, RA)
215/60 R15 94W (RA)
912 mod. 66 — 68
Pirelli P 6000 N3
FA/RA:
https://eprel.ec.europa.eu/qr/596147
RA: https://eprel.ec.europa.eu/qr/596146
911, as of mod. 69
185/70 R15 89W (FA, RA)
215/60 R15 94W (RA)
Jul 30, 2021
Page 2 of 14
Pirelli P 6000 N3
AfterSales
FA/RA:
https://eprel.ec.europa.eu/qr/596148
RA: https://eprel.ec.europa.eu/qr/596146
Freigabe/Approval
Manufacturer's Certificate
185/70 VR 15 (FA)
215/60 VR 15 (RA)
185/70 R15 89V (FA)
215/60 R15 94V (RA)
76/20
Pirelli CN36 N5
Dunlop Sport Classic
N0
ENU
4440
4
911, as of mod. 69
FA/RA: Label values currently not available
911, as of mod. 69
FA: https://eprel.ec.europa.eu/qr/531071
RA: https://eprel.ec.europa.eu/qr/531072
911, as of mod. 69
195/65 R15 91W (FA, RA)
215/60 R15 94W (RA)
195/65 R15 91W (FA)
215/60 R15 94W (RA)
195/65 R15 91W (FA)
215/60 R15 94V (RA)
Pirelli P 6000 N3
FA/RA:
https://eprel.ec.europa.eu/qr/596147
RA: https://eprel.ec.europa.eu/qr/596146
911, as of mod. 69
Pirelli P 6000 N3
Dunlop Sport Classic
N0
FA: https://eprel.ec.europa.eu/qr/596147
RA: https://eprel.ec.europa.eu/qr/596146
911, as of mod. 69
FA: Label values currently not available
RA: https://eprel.ec.europa.eu/qr/531072
911 Carrera 3.0 mod. 75 – 76
Pirelli P7 Cinturato N5
FA/RA: Label values currently not available
205/50 ZR15 (FA)
225/50 ZR15 (RA)
911 3.0 Turbo mod. 75 – 76
911 Carrera 3.0 mod. 75 – 76
Pirelli P-Zero Trofeo R
N0 (UHP tires)
911 3.0 Turbo mod. 75 – 76
FA: https://eprel.ec.europa.eu/qr/621929
RA: https://eprel.ec.europa.eu/qr/621930
Continental
ContiSportContact N2
205/55 ZR16 (FA, RA)
Michelin Pilot Exalto
2 N0
Pirelli P Zero Rosso
Asimmetrico N5
AfterSales
911, as of mod. 69
FA/RA: Label values currently not available
911, as of mod. 69
FA / RA:
https://eprel.ec.europa.eu/qr/408538
911, as of mod. 69
FA / RA:
https://eprel.ec.europa.eu/qr/596145
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Freigabe/Approval
4440
ENU
Manufacturer's Certificate
76/20
Pirelli P Zero Rosso
Asimmetrico N5
205/55 ZR16 (FA)
225/50 ZR16 (RA)
Continental
ContiSportContact N2
Michelin Pilot Exalto
2 N0
Pirelli P7 Cinturato N4
Yokohama 8008P N0
205/55 ZR16 (FA)
245/45 ZR16 (RA)
205/55 ZR16 (FA)
225/50 ZR16 (RA)
Pirelli P Zero Rosso
Asimmetrico N5
Pirelli P-Zero
Direzionale N3 (FA)
Pirelli P-Zero
Asimmetrico N5 (RA)
911, as of mod. 69
FA: https://eprel.ec.europa.eu/qr/596145
RA: https://eprel.ec.europa.eu/qr/596144
911, as of mod. 69
FA/RA: Label values currently not available
911, as of mod. 69
FA: https://eprel.ec.europa.eu/qr/408538
RA: https://eprel.ec.europa.eu/qr/412732
911, as of mod. 69
FA/RA: Label values currently not available
911, as of mod. 69
FA/RA: Label values currently not available
911, as of mod. 69
FA: https://eprel.ec.europa.eu/qr/596145
RA: https://eprel.ec.europa.eu/qr/596143
911 Turbo mod. 75 — 89
911 Carrera "Turbo Look" mods 85 and 86
FA: Label values currently not available
911 Turbo mod. 75 — 89
911 Carrera "Turbo Look" mods 85 and 86
RA: Label values currently not available
911 Turbo mod. 75 — 89
Pirelli P Zero Rosso
Asimmetrico N5
911 Carrera "Turbo Look" mods 85 and 86
FA: https://eprel.ec.europa.eu/qr/596145
RA: https://eprel.ec.europa.eu/qr/596144
205/55 ZR16 (FA)
225/50 ZR16 (RA)
Continental
ContiSportContact N2
Pirelli P-Zero Trofeo R
N0 (UHP tires)
911 Turbo mod. 75 — 89
911 Carrera "Turbo Look" mods 85 and 86
FA/RA: Label values currently not available
911 Turbo mod. 75 — 89
911 Carrera "Turbo Look" mods 85 and 86
FA: https://eprel.ec.europa.eu/qr/621929
Jul 30, 2021
Page 4 of 14
AfterSales
Freigabe/Approval
Manufacturer's Certificate
76/20
ENU
4440
4
RA: https://eprel.ec.europa.eu/qr/621931
911 Turbo mod. 75 — 89
911 Carrera "Turbo look"
Continental
ContiSportContact N2
205/55 ZR 16 (FA)
245/45 ZR 16 (RA)
Pirelli P Zero Rosso
Asimmetrico N5
FA/RA: Label values currently not available
911 Turbo mod. 75 — 89
911 Carrera "Turbo look"
FA: https://eprel.ec.europa.eu/qr/596145
RA: https://eprel.ec.europa.eu/qr/596143
Pirelli P-Zero Trofeo R
N0 (UHP tires)
911 Turbo mod. 75 — 89
911 Carrera "Turbo look"
FA: https://eprel.ec.europa.eu/qr/621929
RA: https://eprel.ec.europa.eu/qr/621932
Speed index: V = 240 km/h (150 mph), W = 270 km/h (165 mph)
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.
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.
AfterSales
Jul 30, 2021
Page 5 of 14
4
Freigabe/Approval
4440
ENU
Manufacturer's Certificate
76/20

Perform visual inspections.

Use new rubber valves at every tire change.

Use only tires approved by Porsche.
Tire Pressure
Air:
FA
RA
All (except for Turbo with
increased performance)
2.0 bar (29 psi)
2.5 bar (36 psi)
Turbo increased performance
2.5 bar (36 psi)
3.0 bar (44 psi)
Turbo
2.0 bar (29 psi)
3.0 bar (44 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
Wheels
165 VR 15 (FA, RA)
4.5 or 5.5Jx15 RO 42
185/70 R15 89W (FA, RA)
185/70 VR 15 (FA, RA)
Notes
6Jx15 RO 36
185/70 R15 89W (FA)
215/60 R15 94W (RA)
185/70 VR 15 (FA)
6Jx15 RO 36 (FA)
911 mod. 65 — 67
215/60 VR 15 (RA)
7Jx15 RO 23.3 (RA)
912 mod. 66 — 68
185/70 R15 89 V (FA)
215/60 R15 94V (RA)
Jul 30, 2021
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195/65 R15 91W (FA, RA)
6Jx15 RO 36
195/65 R15 91W (FA)
6Jx15 RO 36 (FA)
215/60 R15 94W (RA)
7Jx15 RO 23.3 (RA)
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Freigabe/Approval
Manufacturer's Certificate
185/70 R15 89W (FA, RA)
76/20
ENU
4440
4
6Jx15 RO 36
185/70 R15 89W (FA)
215/60 R15 94W (RA)
185/70 VR 15 (FA)
6Jx15 RO 36 (FA)
215/60 VR 15 (RA)
7Jx15 RO 23.3 (RA)
185/70 R15 89V (FA)
911, as of mod. 69
215/60 R15 94V (RA)
195/65 R15 91W (FA, RA)
195/65 R15 91W (FA)
215/60 R15 94W (RA)
215/60 R15 94V (RA)
6Jx15 RO 36
6Jx15 RO 36 (FA)
7Jx15 RO 23.3 (RA)
6Jx15 RO 36 (FA)
911 Carrera 3.0 mod. 75 – 76
205/50 ZR15 (FA)
7Jx15 RO 23.3 (RA)
225/50 ZR15 (RA)
7Jx15 RO 23.3 (FA)
911 Carrera 3.0 mod. 75 – 76
8Jx15 RO 10.6 (RA)
911 3.0 Turbo mod. 75 – 76
205/55 ZR16 (FA, RA)
205/55 ZR16 (FA)
225/50 ZR16 (RA)
205/55 ZR16 (FA)
6Jx16 RO 36 (FA)
7Jx16 RO 23.3 (RA)
911, as of mod. 69
245/45 ZR16 (RA)
205/55 ZR16 (FA)
7Jx16 RO 23.3 (FA)
225/50 ZR16 (RA)
8Jx16 RO 10.6 (RA)
205/55 ZR 16 (FA)
7Jx16 RO 23.3 (FA)
245/45 ZR 16 (RA)
9Jx16 RO 15 (RA)
AfterSales
911 Turbo mod. 75 — 89
911 Carrera "Turbo Look"
mods 85 and 86
911 Turbo, 911 Carrera
“Turbo-Look”
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Freigabe/Approval
4440
ENU
Manufacturer's Certificate
76/20
Makes/Types:
Winter tire approval
Tire size
Tire make and
type
Snow chain
clearance
(only without
spacers)
Comments /
Label value (link to EU database)
only for 911 Carrera "Turbo Look"
185/70 R 15 M+S
FA/RA: Label values currently not available
185/70 R 15 M+S
(FA)
215/60 R 15 M+S
(RA)
only for 911 Carrera "Turbo Look"
FA/RA: Label values currently not available
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
Continental TS
740
FA/RA: Label values currently not available
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
Fulda Kristall 3
FA/RA: Label values currently not available
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
Gislaved Frost
FA/RA: Label values currently not available
195/65 R15 91T
M+S
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
Goodyear Ultra
Grip 3
Yes
Semperit Top
Grip
Vredestein
Snow Star
Continental TS
740 E
Gislaved Frost
Spike
Jul 30, 2021
Page 8 of 14
AfterSales
FA/RA: Label values currently not available
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
FA/RA: Label values currently not available
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
FA/RA: Label values currently not available
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
FA/RA: Label values currently not available
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
FA/RA: Label values currently not available
Freigabe/Approval
Manufacturer's Certificate
195/65 R15 91T
M+S (FA)
215/60 R15 90T
M+S (RA)
215/60 R15 93T
M+S (RA)
205/55 R16 94V
XL M+S (FA, RA)
76/20
4
FA/RA: Label values currently not available
No for
8Jx15 for
911 SC and
911 Carrera
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
FA/RA: Label values currently not available
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
Semperit Top
Grip
Pirelli W240
Sottozero
Standard II N2
4440
911 SC, 911 Carrera, 911
Turbo / ”Turbo-Look”
Continental TS
740
Goodyear Ultra
Grip 3
ENU
FA/RA: Label values currently not available
Yes
205/55 R 16 M+S
(FA)
225/50 R 16 M+S
(RA)
All 911, 912, 911 Turbo (930) and
911 Carrera "Turbo look"
up to mod. 1989
FA / RA:
https://eprel.ec.europa.eu/qr/596139
911 Turbo
911 Carrera „Turbo Look“
FA/RA: Label values currently not available
Speed index: V = 240 km/h
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
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Freigabe/Approval
4440
ENU
Manufacturer's Certificate
76/20
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
Air:
Sizes:
Jul 30, 2021
Page 10 of 14
FA
RA
911 all, Turbo 3.0 l, 911 SC
and 911 Carrera
2.0 bar (29 psi)
2.5 bar (36 psi)
911 Turbo 3.3 L and Turbo look
2.0 bar (29 psi)
3.0 bar (44 psi)
Permissible winter tire and wheel sizes (RO = rim offset in mm)
Tires
Wheels
185/70 R 15 M+S
6Jx15 RO 36 (FA)
7Jx15 RO 23.3 (RA)
185/70 R 15 M+S (FA)
215/60 R 15 M+S (RA)
6Jx15 RO 36 (FA)
7Jx15 RO 23.3 (RA)
185/70 R 15 M+S (FA)
215/60 R 15 M+S (RA)
7Jx15 RO 23.3 (RA)
8Jx15 RO 10.6 (RA)
195/65 R15 91T M+S
6Jx15 (FA)
7Jx15 (RA)
or
6Jx15 (FA, RA)
or
7Jx15 (FA, RA)
911 SC, 911 Carrera, 911
Turbo/Turbo-Look
195/65 R15 91T M+S (FA)
215/60 R15 90T M+S (RA)
215/60 R15 93T M+S (RA)
6Jx15 (FA)
7Jx15 (RA)
or
7Jx15 (FA)
8Jx15 (RA)
911 SC, 911 Carrera, 911
Turbo/Turbo-Look
AfterSales
Comments
only for 911 Carrera Turbo Look
Freigabe/Approval
Manufacturer's Certificate
76/20
ENU
4440
4
6J x 16 RO 36 (FA, RA)
6Jx16 RO 36 (FA)
7Jx16 RO 23.3 (RA)
205/55 R16 94V XL M+S
(FA, RA)
6Jx16 RO 36 (FA)
All 911 and 912
up to mod. 1989
8Jx16 RO 10.6 (RA)
6Jx16 RO 36 (FA)
7Jx16 RO 23.3 (RA)
7Jx16 RO 23.3 (FA)
911 Turbo (930), 911 Carrera
"Turbo Look"
8Jx16 RO 23.3/10.6 (RA)
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.
For vehicles up to 1968:
Welding in Carrera wing extensions or Carrera rear side sections - required for tires sized 215/60 R 15
and 225/50 R 16 - changes the vehicle width from 1,610 mm to 1,652 mm.
On 911, 911 S and 912 vehicle from model years 1965 to 1967, the 32-mm or 40-mm wide wheel hubs
on the front axle must be replaced with the 47-mm wide wheel hubs for model year 1968 on.
The following applies to vehicles from 1969 to 1977:
Welding in Carrera wing extensions or Carrera rear side sections - required for tires sized 215/60 R 15
and 225/50 R 16 - changes the vehicle width from 1,610 mm to 1,652 mm.
Sufficient wheel cover must be achieved by using suitable parts or other suitable measures at the front
and rear wheel housings. The wheel cover may be sufficient, depending on the vehicle type (e.g. when
the vehicle is low, when the wheel cover is widened, etc.).
Wheels:
Overview of Porsche wheels
Identification on the inside/outside of the wheel disc:
Wheel size, rim offset (RO) in mm, Part No. and Porsche logo
4.5 or 5.5J x 15 H2, RO 42
6J x 15 H2, RO 36
6J x 15 H2, RO 36
7J x 15 H2, RO 23.3
6J x 15 H2, RO 36
8J x 15 H2, RO 10.6
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Freigabe/Approval
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Manufacturer's Certificate
76/20
6J x 16 H2, RO 36
7J x 16 H2, RO 23.3
7J x 16 H2, RO 23.3
8J x 16 H2, RO 10.6
7J x 16 H2, RO 23.3
9J x 16 H2, RO 15
Wheel
Mounting:
The tightening torque for securing wheels and spacers is 130 Nm (96 ftlb.).
Wheel Storage: •
•
•
•
•
•
•
•
General
Information:
•
•
•
•
•
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 wheel & tire assemblies can be stacked for storage; we recommend that you increase the
tire pressure by approximately 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.
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.
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:
•
Jul 30, 2021
Page 12 of 14
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.
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Manufacturer's Certificate
•
•
76/20
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4
Maximum permissible radial 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.
New Tires (Replacements):
•
•
•
•
If new tires are to be mounted or the tires of one axle are to be replaced, tires of the same make,
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 on the same axle by more than 30 %.
Refer to WM 449503 for specific details of the vehicle you are working on.
•
•
>The 2mm specification will be given here.
> If there is none listed then the default is 30%.
Repairs to Tires:
•
•
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 to "V", "W", "Y", and "ZR" tires are not permissible, as is the use of inner tubes in tubeless
tires.
Tire Aging:
•
•
•
•
•
•
•
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.
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Freigabe/Approval
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Manufacturer's Certificate
76/20
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.
© 2021 Porsche Cars North America, Inc.
Jul 30, 2021
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