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"tyre" by Sean MacEntee is licensed with CC BY 2.0.
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All you need now is the right tyre

Porsche AG conducted sufficient modern tyre formula testing to issue a new report on modern tyres on classic Porsche models.
The report covers all models but there are the Porsche 928 details only.

Porsche 928 approved tyres

Size RO Axles Tyre Size Tyre Brand and Tread Designation Spec Dry Wet Vehicles
7Jx16 65 FA/RA 225/50 ZR16 Pirelli P-Zero Asimetrico N3 ++ ++ 928 78 - 82 models
        Bridgestone Expedia S-01 N2 0 + 928S 80 - 86 models
        Bridgestone Potenza S-02 N3 ++ +++  
        Continental ContiSportContact N1 ++ +++  
        Michelin SX MXX3 N2 + +  
        Michelin Pilot Exalto PE2 N0 0 +++  
                 
7Jx16 65 FA 225/50 ZR16 Michelin SX MXX3 N2 +++ ++ 928 GT 89-92
        Bridgestone Expedia S-01 N2 ++ ++ 928 S4 CS GT 89
        Bridgestone Potenza S-02 N3 + +++  
        Continental ContiSportContact N1 +++ +++  
8Jx16 52.3 RA 245/45 ZR16 Michelin SX MXX3 N2 +++ ++  
        Bridgestone Expedia S-01 N2 ++ ++  
        Bridgestone Potenza S-02 N3 + +++  
        Continental ContiSportContact N1 +++ +++  
                 
7.5Jx17 65 FA   Bridgestone Potenza S-02 N3 +++ + 928 S4, CS, GT 89, GTS
        Michelin Pilot Sport PS2 N3 ++ ++  
9Jx17 55 RA   Bridgestone Potenza S-02 N3 +++ +  
        Michelin Pilot Sport PS2 N3 ++ ++  


Key: 0 = satisfactory; + = good; ++ = very good; +++ = excellent
Note: Only tyres of the same make, with the same specification code (N0,N1,N2,N3) may be used on a single vehicle

The testing by Porsche for this report was completed in 2009. These are all great tyre brands. Don't be tempted by cheapo tyres not designed for the Porsche 928. Make sure you have N rated (N0,N1,N2,N3) Porsche approved tyres.