No. 27-21

911 (992)
Manufacturer's Certificate
27/21
ENU
4400
4
Approved Wheels and Tires (27/21)
Revision:
This bulletin replaces bulletin Group 4 61/20, dated January 27, 2021.
Model Year:
As of 2020
Vehicle Type:
Type 992 (Coupé/Cabriolet): 911 Carrera/911 Carrera 4/911 Carrera S/911 Carrera
4S/911 Turbo/911 Turbo S/911 Targa 4/911 Targa 4S/911 Targa 4S Heritage Design Edition
Information:
Approval status: May 2021
Sizes:
Permissible tire and wheel sizes
(RO = rim offset in mm, FA = front axle, RA = rear axle)
Tire sizes
Wheel sizes
Snow
chains
911 Carrera/911 Carrera 4/911 Targa 4
Summer
19, 20-inch
FA: 235/40 ZR 19 (96Y) XL
RA: 295/35 ZR 20 (105Y) XL
19, 20-inch
FA: 235/40 ZR 19 (92Y)
RA: 295/35 ZR 20 (101Y)
20, 21-inch
FA: 245/35 ZR 20 (95Y) XL
RA: 305/30 ZR 21 (104Y) XL
20, 21-inch
FA: 245/35 ZR 20 (91Y)
RA: 305/30 ZR 21 (100Y)
Tire sizes
FA: 8.5J x 19, RO 52
RA: 11.5J x 20, RO 67
No
FA: 8.5J x 20, RO 53
RA: 11.5J x 21, RO 67
Wheel sizes
Snow
chains
911 Carrera/911 Carrera 4/911 Targa 4
Winter
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ENU
Manufacturer's Certificate
27/21
Tire sizes
19, 20-inch
FA: 235/40 R 19 92V
RA: 295/35 R 20 101V
*)
19, 20-inch
FA: 235/40 R 19 96V XL
RA: 295/35 R 20 105V XL
*)
Wheel sizes
Snow
chains
FA: 8.5J x 19, RO 52
RA: 11J x 20, RO 66
RA only
20, 21-inch
FA: 245/35 R 20 95V XL
RA: 295/30 R 21 102V XL
FA: 8.5J x 20, RO 53
RA: 11J x 21, RO 66
Tire sizes
Wheel sizes
Snow
chains
911 Carrera S/911 Carrera 4S/911 Targa 4S/911 Targa 4S Heritage Design Edition
Summer
20, 21-inch
FA: 245/35 ZR 20 (95Y) XL
RA: 305/30 ZR 21 (104Y) XL
20, 21-inch
FA: 245/35 ZR 20 (91Y)
RA: 305/30 ZR 21 (100Y)
FA: 8.5J x 20, RO 53
RA: 11.5J x 21, RO 67
No
Winter
19, 20-inch
FA: 235/40 R 19 92V
RA: 295/35 R 20 101V
*)
19, 20-inch
FA: 235/40 R 19 96V XL
RA: 295/35 R 20 105V XL
*)
20, 21-inch
FA: 245/35 R 20 95V XL
RA: 295/30 R 21 102V XL
Jun 15, 2021
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FA: 8.5J x 19, RO 52
RA: 11J x 20, RO 66
RA only
FA: 8.5J x 20, RO 53
RA: 11J x 21, RO 66
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911 (992)
Manufacturer's Certificate
Tire sizes
27/21
ENU
4400
Wheel sizes
4
Snow
chains
911 Turbo/911 Turbo S
Summer
20, 21-inch
FA: 255/35 ZR 20 (97Y) XL
RA: 315/30 ZR 21 (105Y) XL
20, 21-inch
FA: 255/35 ZR 20 (93Y)
RA: 315/30 ZR 21 (105Y) XL
20, 21-inch
FA: 255/35 ZR 20 (97Y) XL
RA: 315/30 ZR 21 (105Y) XL
20, 21-inch
FA: 255/35 ZR 20 (93Y)
RA: 315/30 ZR 21 (105Y) XL
FA: 9J x 20, RO 41
RA: 11.5J x 21, RO 67
No
FA: 9.5J x 20, RO 44
RA: 12J x 21, RO 70
No
FA: 8.5J x 20, RO 40
RA: 11J x 21, RO 66
RA only
Winter
20, 21-inch
FA: 245/35 R 20 95V XL
RA: 305/30 R 21 104V XL
*) Not for vehicles with Porsche Ceramic Composite Brake (PCCB).
Wheels:
Overview of Porsche wheels for summer and winter tires
Identification on inside of wheel:
Wheel size, rim offset (RO) in mm, part number (without color code FFF) and Porsche logo
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911 (992)
4400
Wheels:
ENU
Manufacturer's Certificate
27/21
Overview of Porsche wheels for summer and winter tires
Identification on inside of wheel:
Wheel size, rim offset (RO) in mm, part number (without color code FFF) and Porsche logo
19-inch "Carrera 7" wheel
FA: 8.5J x 19, RO 52 (summer, winter)
Part No. 992.601.025_FFF
Carrera 7
20-inch "Carrera 7" wheel
RA: 11.5J x 20, RO 67 (summer)
Part No. 992.601.025.A_FFF
RA: 11J x 20, RO 66 (winter)
Part No. 992.601.025.B_FFF
Carrera 7
20-inch "Carrera S5" wheel
FA: 8.5J x 20, RO 53 (summer, winter)
Part No. 992.601.025. C_FFF (summer, winter)
Part No. 992.601.026. C_FFF (summer)
Carrera S5
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911 (992)
Manufacturer's Certificate
27/21
ENU
4400
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20-inch "RS Spyder Design 2" wheel
FA: 8.5J x 20, RO 53 (summer)
Part No. 992.601.025.F_FFF
RS Spyder Design 2
20-inch "Carrera Classic 3" wheel
FA: 8.5J x 20, RO 53 (summer)
Part No. 992.601.025.H_FFF
Carrera Classic 3
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911 (992)
4400
ENU
Manufacturer's Certificate
27/21
20-inch "Carrera Exclusive Design" wheel
FA: 8.5J x 20, RO 53 (summer)
Part No. 992.601.025.K_FFF
Carrera Exclusive Design
20-inch wheel "Turbo S 4"
FA: 9J x 20, RO 41 (summer)
Part No. 992.601.025.T_FFF
FA: 8.5J x 20, RO 40 (winter)
Part No. 992.601.025.AB_FFF
Turbo S 4
20-inch "Turbo Exclusive Design" wheel
FA: 9.5J x 20, RO 44 (summer)
Part No. 992.601.025.AE_FFF
Turbo Exclusive Design
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911 (992)
Manufacturer's Certificate
27/21
ENU
4400
4
20-inch "Turbo S Exclusive Design" wheel
FA: 9.5J x 20, RO 44 (summer)
Part No. 992.601.025.AF_FFF
Turbo S Exclusive Design
20-inch "Turbo 5" wheel
FA: 9J x 20, RO 41 (summer)
Part No. 992.601.025.AR_FFF
FA: 8.5J x 20, RO 40 (winter)
Part No. 992.601.025.P__FFF
Turbo 5
21-inch "Carrera S5" wheel
RA: 11.5J x 21, RO 67 (summer)
Part No. 992.601.025.D_FFF
Part No. 992.601.026.D_FFF
RA: 11J x 21, RO 66 (winter)
Part No. 992.601.025.E_FFF
Carrera S5
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911 (992)
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ENU
Manufacturer's Certificate
27/21
21-inch "RS Spyder Design 2" wheel
RA: 11.5J x 21, RO 67 (summer)
Part No. 992.601.025.G_FFF
RS Spyder Design 2
21-inch "Carrera Classic 3" wheel
RA: 11.5J x 21, RO 67 (summer)
Part No. 992.601.025.J_FFF
Carrera Classic 3
Jun 15, 2021
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911 (992)
Manufacturer's Certificate
27/21
ENU
4400
4
21-inch "Carrera Exclusive Design" wheel
RA: 11.5J x 21, RO 67 (summer)
Part No. 992.601.025.L_FFF
Carrera Exclusive Design
21-inch wheel "Turbo S 4"
RA: 11.5J x 21, RO 67 (summer)
Part No. 992.601.025.AA_FFF
RA: 11J x 21, RO 66 (winter)
Part No. 992.601.025.AC_FFF
Turbo S 4
21-inch "Turbo Exclusive Design" wheel
RA: 12J x 21, RO 70 (summer)
Part No. 992.601.025.AJ_FFF
Turbo Exclusive Design
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911 (992)
4400
ENU
Manufacturer's Certificate
27/21
21-inch "Turbo S Exclusive Design" wheel
RA: 12J x 21, RO 70 (summer)
Part No. 992.601.025.AG_FFF
Turbo S Exclusive Design
21-inch "Turbo 5" wheel
RA: 11.5J x 21, RO 67 (summer)
Part No. 992.601.025.N__FFF
RA: 11J x 21, RO 66 (winter)
Part No. 992.601.025.Q__FFF
Turbo 5
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.
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911 (992)
Manufacturer's Certificate
27/21
ENU
4400
4
Information
Wheel
Mounting:
using wheel bolts:
Tightening torque 160 Nm (118 ftlb.)
using central wheel lock:
Tightening torque 600 Nm (444 ftlb.)
Summer Tires:
Tire make and type/
label value (link to EU database)
Tire size
911 Carrera/911 Carrera 4/911 Targa 4
FA: 235/40 ZR 19 (96Y) XL
RA: 295/35 ZR 20 (105Y) XL
FA: 235/40 ZR 19 (92Y)
RA: 295/35 ZR 20 (101Y)
FA: 245/35 ZR 20 (95Y) XL
RA: 305/30 ZR 21 (104Y) XL
FA: 245/35 ZR 20 (91Y)
RA: 305/30 ZR 21 (100Y)
Michelin PilotSport 4S NA0
FA: https://eprel.ec.europa.eu/qr/413170
RA: https://eprel.ec.europa.eu/qr/410061
Pirelli P Zero NA0
FA: https://eprel.ec.europa.eu/qr/595483
RA: https://eprel.ec.europa.eu/qr/595482
Goodyear Eagle F1 Asymmetric3 NA0
FA: https://eprel.ec.europa.eu/qr/529603
RA: https://eprel.ec.europa.eu/qr/529604
Pirelli P Zero NA1
FA: https://eprel.ec.europa.eu/qr/596523
RA: https://eprel.ec.europa.eu/qr/596522
911 Carrera S/911 Carrera 4S/911 Targa 4S/911 Targa 4S Heritage Design Edition
FA: 245/35 ZR 20 (95Y) XL
RA: 305/30 ZR 21 (104Y) XL
FA: 245/35 ZR 20 (91Y)
RA: 305/30 ZR 21 (100Y)
Goodyear Eagle F1 Asymmetric3 NA0
FA: https://eprel.ec.europa.eu/qr/529603
RA: https://eprel.ec.europa.eu/qr/529604
Pirelli P Zero NA1
FA: https://eprel.ec.europa.eu/qr/596523
RA: https://eprel.ec.europa.eu/qr/596522
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911 (992)
4400
ENU
Manufacturer's Certificate
27/21
911 Turbo/911 Turbo S
Tire make and type/
label value (link to EU database)
Tire size
911 Carrera/911 Carrera 4/911 Targa 4
FA: 255/35 ZR 20 (97Y) XL
RA: 315/30 ZR 21 (105Y) XL
FA: 255/35 ZR 20 (93Y)
RA: 315/30 ZR 21 (105Y) XL
Winter Tires:
Tire size
Goodyear Eagle F1 Super Sport NA0
FA: https://eprel.ec.europa.eu/qr/529629
RA: https://eprel.ec.europa.eu/qr/529628
Pirelli P Zero NA1
FA: https://eprel.ec.europa.eu/qr/596542
RA: https://eprel.ec.europa.eu/qr/596543
Tire make and type/
label value (link to EU database)
911 Carrera/911 Carrera 4/911 Targa 4
FA: 235/40 R 19 92V
RA: 295/35 R 20 101V
*)
FA: 235/40 R 19 96V XL
RA: 295/35 R 20 105V XL
*)
Pirelli P Zero Winter NA0
FA: https://eprel.ec.europa.eu/qr/595748
RA: https://eprel.ec.europa.eu/qr/595749
Continental Wintercontact TS 860 S NA0
FA: https://eprel.ec.europa.eu/qr/479552
RA: https://eprel.ec.europa.eu/qr/479553
Continental TS 860 S NA0
FA: https://eprel.ec.europa.eu/qr/479365
FA: 245/35 R 20 95V XL
RA: 295/30 R 21 102V XL
*)
RA: https://eprel.ec.europa.eu/qr/479508
Michelin Pilot Alpin 5 NA0
FA: https://eprel.ec.europa.eu/qr/409016
RA: https://eprel.ec.europa.eu/qr/410247
911 Carrera S/911 Carrera 4S/911 Targa 4S/911 Targa 4S Heritage Design Edition
FA: 235/40 R 19 92V
RA: 295/35 R 20 101V
*)
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Pirelli P Zero Winter NA0
FA: https://eprel.ec.europa.eu/qr/595748
RA: https://eprel.ec.europa.eu/qr/595749
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911 (992)
Manufacturer's Certificate
27/21
ENU
4400
4
Tire make and type/
label value (link to EU database)
Tire size
Continental Wintercontact TS 860 S NA0
FA: 235/40 R 19 96V XL
RA: 295/35 R 20 105V XL
*)
FA: https://eprel.ec.europa.eu/qr/479552
RA: https://eprel.ec.europa.eu/qr/479553
Continental TS 860 S NA0
FA: https://eprel.ec.europa.eu/qr/479365
FA: 245/35 R 20 95V XL
RA: 295/30 R 21 102V XL
*)
RA: https://eprel.ec.europa.eu/qr/479508
Michelin Pilot Alpin 5 NA0
FA: https://eprel.ec.europa.eu/qr/409016
RA: https://eprel.ec.europa.eu/qr/410247
911 Turbo/911 Turbo S
Goodyear Ultragrip Performance Gen–1 NA0
FA: https://eprel.ec.europa.eu/qr/529616
RA: https://eprel.ec.europa.eu/qr/529627
FA: 245/35 R 20 95V XL
RA: 305/30 R 21 104V XL
Michelin Pilot Alpin 5 NA5
FA: https://eprel.ec.europa.eu/qr/410097
RA: https://eprel.ec.europa.eu/qr/411084
*) Not for vehicles with Porsche Ceramic Composite Brake (PCCB). Not for Australia/South
Korea/Vietnam vehicles with PASM sports chassis.
Arrow with inscription “Rotation”
= directional mounting
"Inside/Outside" inscription
= mounting on specified side only
Arrow with both inscriptions “Rotation” and
“Inside/Outside”
= directional mounting on specified side only.
Information
"N..." = Specification code of the tire, e.g. "NA0", "NA1", "NA2" ... The complete “N ...” code of the
relevant tire makes must be shown on the tire sidewall near the 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.
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Manufacturer's Certificate
27/21
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
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
(NA0, NA1, NA2, etc.) on a vehicle.
Tire Pressure:
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.
WARNING
Driving at high speed with low tire pressure can cause irreparable damage to tires.

Set Comfort air pressure for tires only on vehicles with Tire Pressure Monitoring System (TPMS) and
“Comfort” selected in the "Tire pressure" main menu in the multi-function display.
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.
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911 (992)
Manufacturer's Certificate
27/21
ENU
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4
Standard tire pressure for summer tires + UHP
Standard tire pressure for summer tires + UHP
911 Carrera/911 Carrera 4/911 Targa 4
Full load,
comfort air
pressure
up to 270
km/h (165
mph)
Tire size
Wheel
size
Axle
Part load
Full load
Part load,
comfort air
pressure
up to 270
km/h (165
mph)
235/40 ZR
19
8.5 x 19
FA
2.2 bar
220 kPa
31 psi
2.4 bar
240 kPa
35 psi
2.0 bar
200 kPa
29 psi
2.3 bar
230 kPa
33 psi
295/35 ZR
20
11.5J x 20
RA
2.5 bar
250 kPa
36 psi
3.0 bar
300 kPa
44 psi
2.2 bar
220 kPa
31 psi
2.6 bar
260 kPa
37 psi
245/35 ZR
20
8.5J x 20
FA
2.3 bar
230 kPa
33 psi
2.5 bar
250 kPa
36 psi
2.0 bar
200 kPa
29 psi
2.3 bar
230 kPa
33 psi
305/30 ZR
21
11.5J x 21
RA
2.6 bar
260 kPa
37 psi
3.1 bar
310 kPa
45 psi
2.2 bar
220 kPa
31 psi
2.6 bar
260 kPa
37 psi
Standard tire pressure for summer tires + UHP
911 Carrera S/911 Carrera 4S
1) except Cabriolet sports chassis
2) except Coupé with Aerokit
3) except Carrera S Coupé and Carrera 4S Coupé with sports chassis and without sliding roof
Tire size
Wheel
size
Axle
Part load
Full load
Part load,
comfort air
pressure
up to 270
km/h (165
mph)
245/35 ZR
20
8.5J x 20
FA
2.3 bar
230 kPa
33 psi
2.5 bar
250 kPa
36 psi
2.0 bar
200 kPa
29 psi
AfterSales
Full load,
comfort air
pressure
up to 270
km/h (165
mph)
2.3 bar
230 kPa
33 psi
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305/30 ZR
21
11.5J x 21
2.6 bar
260 kPa
37 psi
RA
3.1 bar
310 kPa
45 psi
2.2 bar
220 kPa
31 psi
2.6 bar
260 kPa
37 psi
Standard tire pressure for summer tires + UHP
911 Targa S and
1) 992 Carrera S/Carrera 4S Cabriolet with sports chassis and sports aerodynamics
2) and Coupé with Aerokit
3) and 992 Carrera S/Carrera 4S Coupé with sports chassis
and sports aerodynamics and without sliding roof
Full load,
comfort air
pressure
up to 270
km/h (165
mph)
Tire size
Wheel
size
Axle
Part load
Full load
Part load,
comfort air
pressure
up to 270
km/h (165
mph)
245/35 ZR
20
8.5J x 20
FA
2.3 bar
230 kPa
33 psi
2.6 bar
260 kPa
37 psi
2.0 bar
200 kPa
29 psi
2.3 bar
230 kPa
33 psi
305/30 ZR
21
11.5J x 21
RA
2.7 bar
270 kPa
39 psi
3.2 bar
320 kPa
46 psi
2.2 bar
220 kPa
31 psi
2.6 bar
260 kPa
37 psi
Standard tire pressure for summer tires + UHP
911 Turbo/911 Turbo S
Tire size
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Wheel
size
255/35 ZR
20
9/9.5J x
20
315/30 ZR
21
11.5/12J
x 21
Axle
Part load
Full load
Part load,
comfort air
pressure
up to 270
km/h (165
mph)
Full load,
comfort air
pressure
up to 270
km/h (165
mph)
FA
2.4 bar
240 kPa
35 psi
2.6 bar
260 kPa
37 psi
2.1 bar
210 kPa
30 psi
2.3 bar
230 kPa
33 psi
RA
2.9 bar
290 kPa
42 psi
3.3 bar
330 kPa
48 psi
2.4 bar
240 kPa
35 psi
2.7 bar
270 kPa
39 psi
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911 (992)
Manufacturer's Certificate
27/21
ENU
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4
Standard tire pressure for winter tires
Standard tire pressure for winter tires
911 Carrera/911 Carrera 4/911 Targa 4
Tire size
Wheel size
Axle
Part load
Full load
235/40 R 19
8.5J x 19
FA
2.2 bar
220 kPa
31 psi
2.2 bar
220 kPa
31 psi
295/35 R 20
11J x 20
RA
2.2 bar
220 kPa
31 psi
2.5 bar
250 kPa
36 psi
245/35 R 20
8.5J x 20
FA
2.2 bar
220 kPa
31 psi
2.5 bar
250 kPa
36 psi
295/30 R 21
11J x 21
RA
2.4 bar
240 kPa
35 psi
2.9 bar
290 kPa
42 psi
Standard tire pressure for winter tires
911 Carrera S/911 Carrera 4S
1) except Cabriolet sports chassis
2) except Coupé with Aerokit
3) except Carrera S Coupé and Carrera 4S Coupé with sports chassis and without sliding roof
Tire size
Wheel size
Axle
Part load
Full load
235/40 R 19
8.5J x 19
FA
2.2 bar
220 kPa
31 psi
2.2 bar
220 kPa
31 psi
295/35 R 20
11J x 20
RA
2.2 bar
220 kPa
31 psi
2.5 bar
250 kPa
36 psi
245/35 R 20
8.5J x 20
FA
2.2 bar
220 kPa
31 psi
2.5 bar
250 kPa
36 psi
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295/30 R 21
RA
11J x 21
2.4 bar
240 kPa
35 psi
2.9 bar
290 kPa
42 psi
Standard tire pressure for winter tires
911 Targa S and
1) 992 Carrera S/Carrera 4S Cabriolet with sports chassis and sports aerodynamics
2) and Coupé with Aerokit
3) and 992 Carrera S/Carrera 4S Coupé with sports chassis
and sports aerodynamics and without sliding roof
Tire size
Wheel size
Axle
Part load
Full load
235/40 R 19
8.5J x 19
FA
2.2 bar
220 kPa
31 psi
2.3 bar
230 kPa
33 psi
295/35 R 20
11J x 20
RA
2.2 bar
220 kPa
31 psi
2.6 bar
260 kPa
37 psi
245/35 R 20
8.5J x 20
FA
2.2 bar
220 kPa
31 psi
2.5 bar
250 kPa
36 psi
295/30 R 21
11J x 21
RA
2.5 bar
250 kPa
36 psi
2.9 bar
290 kPa
42 psi
Standard tire pressure for winter tires
911 Turbo/911 Turbo S
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Tire size
Wheel size
Axle
Part load
Full load
245/35 R 20
8.5J x 20
FA
2.2 bar
220 kPa
31 psi
2.5 bar
250 kPa
36 psi
305/30 R 21
11J x 21
RA
2.6 bar
260 kPa
37 psi
3.0 bar
300 kPa
44 psi
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911 (992)
Manufacturer's Certificate
27/21
ENU
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Snow Chains:
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.
Porsche offers the following snow chains as accessories:
Tire size
295/35 R 20
295/30 R 21
Wheel Storage: •
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General
Information:
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Porsche Part No.
Type of snow chain
992.044.690.A
Link-type chain, quick fit
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:
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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).
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Manufacturer's Certificate
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Controlled matching:
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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 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):
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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.
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>The 2mm specification will be given here.
> If there is none listed then the default is 30%.
Repairs to Tires:
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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:
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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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Manufacturer's Certificate
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ENU
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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.
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