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I switched the OEM Dunlop SP Sport Maxx GT tires with Michelin A/S 4 on the 650xi GC and highly recommend to anyone still using run flats to go non run flats for comfort.
I recall looking at various places that sell those tires, including Michelin, and after entering my car details I was told that the front tire pressure must be set to 42 psi. oem is 39 front, 42 rear, so I've been setting at 42 psi front and rear.
These are the tires I got:
Michelin A/S 4
245/35ZR20 95Y XL BSW
MSPN : 3150
275/30ZR20 97Y XL BSW
MSPN : 64805
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