Word of warning. There are literally 2 tires that fit on this rim. I have them on my car. There are zero all weather or winter options.
Not true. And if you're thinking of all-season tires on your 21" forged wheels you bought the wrong car.
All major premium tire manufacturers (Pirelli, Continental, Michelin, Dunlop) offer tires in that size, both summer and winter, including the OEM MGT Pirellis and Continentals, and the insanely expensive custom Pirelli Color edition. Beside those, there are a few no name/Chinese brand tires that you shouldn't even consider, but the option is there.
And, if you're not happy with the choices, you can go for 255/35 and 295/30 and have access to newer stuff like Michelin Pilot Sport 4S.